diff --git a/RELEASE.txt b/RELEASE.txt
index 92ddf7f4b..7eff077d3 100755
--- a/RELEASE.txt
+++ b/RELEASE.txt
@@ -55,6 +55,8 @@ This document describes the differences between v7.0.0 and v6.x.x
 - 10g eiger nextframenumber get fixed.
 - stop, able to set nextframenumber to a consistent (max + 1) for all modules if different (eiger/ctb/jungfrau/moench)
 - ctb: can set names for all the dacs
+- fpga/kernel programming, checks if drive is a special file and not a normal file
+- gotthard 25 um image reconstructed in gui and virtual hdf5 (firmware updated for slave to reverse channels)
 
 2. Resolved Issues
 ==================
diff --git a/python/src/detector.cpp b/python/src/detector.cpp
index 0bb25e64e..2323a0e1d 100644
--- a/python/src/detector.cpp
+++ b/python/src/detector.cpp
@@ -1544,9 +1544,10 @@ void init_det(py::module &m) {
                  Detector::setAdditionalJsonParameter,
              py::arg(), py::arg(), py::arg() = Positions{})
         .def("programFPGA",
-             (void (Detector::*)(const std::string &, sls::Positions)) &
+             (void (Detector::*)(const std::string &, const bool,
+                                 sls::Positions)) &
                  Detector::programFPGA,
-             py::arg(), py::arg() = Positions{})
+             py::arg(), py::arg(), py::arg() = Positions{})
         .def("resetFPGA",
              (void (Detector::*)(sls::Positions)) & Detector::resetFPGA,
              py::arg() = Positions{})
diff --git a/slsDetectorCalibration/singlePhotonDetector.h b/slsDetectorCalibration/singlePhotonDetector.h
index 083e25f7b..96d239c97 100644
--- a/slsDetectorCalibration/singlePhotonDetector.h
+++ b/slsDetectorCalibration/singlePhotonDetector.h
@@ -429,23 +429,28 @@ class singlePhotonDetector : public analogDetector<uint16_t> {
                     for (ic = -(clusterSize / 2); ic < (clusterSize / 2) + 1;
                          ic++) {
 
-                        if ((iy + ir) >= iy && (iy + ir) < ny &&
-                            (ix + ic) >= ix && (ix + ic) < nx) {
+                        if ((iy + ir) >= 0 && (iy + ir) < ny &&
+                            (ix + ic) >= 0 && (ix + ic) < nx) {
+
+
+                        if ((iy + ir) >= iy && (ix + ic) >= ix ) {
                             val[(iy + ir) * nx + ix + ic] =
                                 subtractPedestal(data, ix + ic, iy + ir, cm);
-                            v = &(val[(iy + ir) * nx + ix + ic]);
-                            tot += *v;
-                            if (ir <= 0 && ic <= 0)
-                                bl += *v;
-                            if (ir <= 0 && ic >= 0)
-                                br += *v;
-                            if (ir >= 0 && ic <= 0)
-                                tl += *v;
-                            if (ir >= 0 && ic >= 0)
-                                tr += *v;
-                            if (*v > max) {
-                                max = *v;
-                            }
+
+			}
+			v = &(val[(iy + ir) * nx + ix + ic]);
+			tot += *v;
+			if (ir <= 0 && ic <= 0)
+			  bl += *v;
+			if (ir <= 0 && ic >= 0)
+			  br += *v;
+			if (ir >= 0 && ic <= 0)
+			  tl += *v;
+			if (ir >= 0 && ic >= 0)
+			  tr += *v;
+			if (*v > max) //{
+			  max = *v;
+			//}
                         }
                     }
                 }
@@ -513,12 +518,19 @@ class singlePhotonDetector : public analogDetector<uint16_t> {
                         for (ic = -(clusterSize / 2);
                              ic < (clusterSize / 2) + 1; ic++) {
                             if ((iy + ir) >= 0 && (iy + ir) < ny &&
-                                (ix + ic) >= 0 && (ix + ic) < nx)
-                                (clusters + nph)
+                                (ix + ic) >= 0 && (ix + ic) < nx) {
+			      (clusters + nph)
                                     ->set_data(val[(iy + ir) * nx + ix + ic],
                                                ic, ir);
+			      if (val[(iy + ir) * nx + ix + ic]>max) 
+				good=0;
+			    }
                         }
                     }
+		    if (good==0) {
+		      (clusters + nph)->print();
+		      cout << max << " " <<  val[iy * nx + ix] << endl;
+		    }
                     good = 1;
                     if (eMin > 0 && tot < eMin)
                         good = 0;
diff --git a/slsDetectorCalibration/single_photon_hit.h b/slsDetectorCalibration/single_photon_hit.h
index 919f6af4b..0317e6e4d 100644
--- a/slsDetectorCalibration/single_photon_hit.h
+++ b/slsDetectorCalibration/single_photon_hit.h
@@ -216,14 +216,18 @@ class single_photon_hit {
 
         // int ix, iy;
 
+      printf("***************\n");
+      printf("** %d %d **\n",x,y);
         for (int iy = 0; iy < dy; iy++) {
             for (int ix = 0; ix < dx; ix++) {
                 printf("%d \t", data[ix + iy * dx]);
             }
             printf("\n");
         }
+      printf("***************\n");
     }
 
+
     /**
         assign the value to the element of the cluster matrix, with relative
        coordinates where the center of the cluster is (0,0) \param v value to be
diff --git a/slsDetectorGui/include/qDrawPlot.h b/slsDetectorGui/include/qDrawPlot.h
index df96214bf..2c8739040 100644
--- a/slsDetectorGui/include/qDrawPlot.h
+++ b/slsDetectorGui/include/qDrawPlot.h
@@ -91,8 +91,10 @@ class qDrawPlot : public QWidget, private Ui::PlotObject {
     void Update2dPlot();
     void Update1dXYRange();
     void Update2dXYRange();
+    void rearrangeGotthard25data(double *data);
 
     static const int NUM_PEDESTAL_FRAMES = 20;
+    static const int NUM_GOTTHARD25_CHANS = 1280;
     sls::Detector *det;
     slsDetectorDefs::detectorType detType;
 
@@ -164,4 +166,5 @@ class qDrawPlot : public QWidget, private Ui::PlotObject {
     uint32_t pixelMask{0};
     uint32_t gainMask{0};
     int gainOffset{0};
+    bool gotthard25;
 };
diff --git a/slsDetectorGui/src/qDrawPlot.cpp b/slsDetectorGui/src/qDrawPlot.cpp
index a95c9efcd..5101c11dd 100644
--- a/slsDetectorGui/src/qDrawPlot.cpp
+++ b/slsDetectorGui/src/qDrawPlot.cpp
@@ -80,6 +80,10 @@ void qDrawPlot::SetupWidgetWindow() {
         fileSaveName = "Image";
     }
 
+    gotthard25 = ((detType == slsDetectorDefs::GOTTHARD2 ||
+                   detType == slsDetectorDefs::GOTTHARD) &&
+                  det->size() == 2);
+
     SetupPlots();
     SetDataCallBack(true);
     det->registerAcquisitionFinishedCallback(&(GetAcquisitionFinishedCallBack),
@@ -807,6 +811,11 @@ void qDrawPlot::GetData(detectorData *data, uint64_t frameIndex,
         isGainDataExtracted = false;
     }
 
+    // gotthard25um rearranging
+    if (gotthard25) {
+        rearrangeGotthard25data(rawData);
+    }
+
     // title and frame index titles
     plotTitle =
         plotTitlePrefix + QString(data->fileName.c_str()).section('/', -1);
@@ -1145,6 +1154,18 @@ void qDrawPlot::toDoublePixelData(double *dest, char *source, int size,
     }
 }
 
+void qDrawPlot::rearrangeGotthard25data(double *data) {
+    const int nChans = NUM_GOTTHARD25_CHANS;
+    double temp[nChans * 2] = {0.0};
+    for (int i = 0; i != nChans; ++i) {
+        // master module
+        temp[i * 2] = data[i];
+        // slave module
+        temp[i * 2 + 1] = data[nChans + i];
+    }
+    memcpy(data, temp, nChans * 2 * sizeof(double));
+}
+
 void qDrawPlot::UpdatePlot() {
     std::lock_guard<std::mutex> lock(mPlots);
     LOG(logDEBUG) << "Update Plot";
diff --git a/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer b/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer
index 3e3a18e9e..b85880659 100755
Binary files a/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer and b/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer differ
diff --git a/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServer_developer b/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServer_developer
index e0544455f..de82c02ef 100755
Binary files a/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServer_developer and b/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServer_developer differ
diff --git a/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer b/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer
index 40935898f..ad2379ae3 100755
Binary files a/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer and b/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer differ
diff --git a/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServer_developer b/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServer_developer
index 09af215a0..43d71d90b 100755
Binary files a/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServer_developer and b/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServer_developer differ
diff --git a/slsDetectorServers/jungfrauDetectorServer/bin/jungfrauDetectorServer_developer b/slsDetectorServers/jungfrauDetectorServer/bin/jungfrauDetectorServer_developer
index bccdf98d0..d4200dfea 100755
Binary files a/slsDetectorServers/jungfrauDetectorServer/bin/jungfrauDetectorServer_developer and b/slsDetectorServers/jungfrauDetectorServer/bin/jungfrauDetectorServer_developer differ
diff --git a/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServer_developer b/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServer_developer
index 391942c4e..43cdabacb 100755
Binary files a/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServer_developer and b/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServer_developer differ
diff --git a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer
index 4f5714204..dadb7a648 100755
Binary files a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer and b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer differ
diff --git a/slsDetectorServers/slsDetectorServer/include/programViaBlackfin.h b/slsDetectorServers/slsDetectorServer/include/programViaBlackfin.h
index 0c644f27b..5c8cbec53 100644
--- a/slsDetectorServers/slsDetectorServer/include/programViaBlackfin.h
+++ b/slsDetectorServers/slsDetectorServer/include/programViaBlackfin.h
@@ -26,10 +26,12 @@ int preparetoCopyProgram(char *mess, char *functionType, FILE **fd,
                          uint64_t fsize);
 int eraseAndWriteToFlash(char *mess, enum PROGRAM_INDEX index,
                          char *functionType, char *clientChecksum,
-                         ssize_t fsize);
+                         ssize_t fsize, int forceDeleteNormalFile);
 int getDrive(char *mess, enum PROGRAM_INDEX index);
 /** Notify fpga not to touch flash, open src and flash drive to write */
-int openFileForFlash(char *mess, FILE **flashfd, FILE **srcfd);
+int openFileForFlash(char *mess, enum PROGRAM_INDEX index, FILE **flashfd, FILE **srcfd,
+                     int forceDeleteNormalFile);
+int checkNormalFile(char *mess, enum PROGRAM_INDEX index, int forceDeleteNormalFile);
 int eraseFlash(char *mess);
 /* write from tmp file to flash */
 int writeToFlash(char *mess, ssize_t fsize, FILE *flashfd, FILE *srcfd);
diff --git a/slsDetectorServers/slsDetectorServer/include/slsDetectorServer_funcs.h b/slsDetectorServers/slsDetectorServer/include/slsDetectorServer_funcs.h
index e68720305..385b45ae7 100644
--- a/slsDetectorServers/slsDetectorServer/include/slsDetectorServer_funcs.h
+++ b/slsDetectorServers/slsDetectorServer/include/slsDetectorServer_funcs.h
@@ -285,7 +285,8 @@ int update_detector_server(int);
 int receive_program(int file_des, enum PROGRAM_INDEX index);
 void receive_program_via_blackfin(int file_des, enum PROGRAM_INDEX index,
                                   char *functionType, uint64_t filesize,
-                                  char *checksum, char *serverName);
+                                  char *checksum, char *serverName,
+                                  int forceDeleteNormalFile);
 void receive_program_default(int file_des, enum PROGRAM_INDEX index,
                              char *functionType, uint64_t filesize,
                              char *checksum, char *serverName);
diff --git a/slsDetectorServers/slsDetectorServer/src/programViaBlackfin.c b/slsDetectorServers/slsDetectorServer/src/programViaBlackfin.c
index 5ad37fd43..0d5d6d840 100644
--- a/slsDetectorServers/slsDetectorServer/src/programViaBlackfin.c
+++ b/slsDetectorServers/slsDetectorServer/src/programViaBlackfin.c
@@ -7,6 +7,7 @@
 #include "slsDetectorServer_defs.h"
 
 #include <string.h>
+#include <sys/stat.h>
 #include <sys/sysinfo.h>
 #include <unistd.h> // usleep
 
@@ -38,6 +39,9 @@
 
 #define CMD_GET_AMD_FLASH  "dmesg | grep Amd"
 
+#define CMD_CREATE_DEVICE_FILE_PART1 "mknod"
+#define CMD_CREATE_DEVICE_FILE_PART2 "c 90 6"
+
 #define FLASH_BUFFER_MEMORY_SIZE (128 * 1024) // 500 KB
 // clang-format on
 
@@ -274,7 +278,8 @@ int allowUpdate(char *mess, char *functionType) {
         getKernelVersion(retvals);
         snprintf(mess, MAX_STR_LENGTH,
                  "Could not update %s. Kernel version %s is too old to "
-                 "update the Amd flash/ root directory. Most likely, blackfin needs rescue or replacement. Please contact us.\n",
+                 "update the Amd flash/ root directory. Most likely, blackfin "
+                 "needs rescue or replacement. Please contact us.\n",
                  functionType, retvals);
         LOG(logERROR, (mess));
         return FAIL;
@@ -319,7 +324,7 @@ int preparetoCopyProgram(char *mess, char *functionType, FILE **fd,
 
 int eraseAndWriteToFlash(char *mess, enum PROGRAM_INDEX index,
                          char *functionType, char *clientChecksum,
-                         ssize_t fsize) {
+                         ssize_t fsize, int forceDeleteNormalFile) {
 
     memset(messageType, 0, sizeof(messageType));
     strcpy(messageType, functionType);
@@ -330,7 +335,8 @@ int eraseAndWriteToFlash(char *mess, enum PROGRAM_INDEX index,
 
     FILE *flashfd = NULL;
     FILE *srcfd = NULL;
-    if (openFileForFlash(mess, &flashfd, &srcfd) == FAIL) {
+    if (openFileForFlash(mess, index, &flashfd, &srcfd, forceDeleteNormalFile) ==
+        FAIL) {
         return FAIL;
     }
 
@@ -434,7 +440,8 @@ int getDrive(char *mess, enum PROGRAM_INDEX index) {
     return OK;
 }
 
-int openFileForFlash(char *mess, FILE **flashfd, FILE **srcfd) {
+int openFileForFlash(char *mess, enum PROGRAM_INDEX index, FILE **flashfd, FILE **srcfd,
+                     int forceDeleteNormalFile) {
     // open src file
     *srcfd = fopen(TEMP_PROG_FILE_NAME, "r");
     if (*srcfd == NULL) {
@@ -447,6 +454,11 @@ int openFileForFlash(char *mess, FILE **flashfd, FILE **srcfd) {
     }
     LOG(logDEBUG1, ("Temp file ready for reading\n"));
 
+    if (checkNormalFile(mess, index, forceDeleteNormalFile) == FAIL) {
+        fclose(*srcfd);
+        return FAIL;
+    }
+
     // open flash drive for writing
     *flashfd = fopen(flashDriveName, "w");
     if (*flashfd == NULL) {
@@ -462,6 +474,95 @@ int openFileForFlash(char *mess, FILE **flashfd, FILE **srcfd) {
     return OK;
 }
 
+int checkNormalFile(char *mess, enum PROGRAM_INDEX index, int forceDeleteNormalFile) {
+#ifndef VIRTUAL
+    // check if its a normal file or special file
+    struct stat buf;
+    if (stat(flashDriveName, &buf) == -1) {
+        sprintf(mess,
+                "Could not %s. Unable to find the flash drive %s\n",
+                messageType, flashDriveName);
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+    // zero = normal file (not char special drive file)
+    if (!S_ISCHR(buf.st_mode)) {
+        // kernel memory is not permanent
+        if (index != PROGRAM_FPGA) {
+            sprintf(mess,
+                    "Could not %s. The flash drive found is a normal file. "
+                    "Reboot board using 'rebootcontroller' command to load "
+                    "proper device tree\n",
+                    messageType);
+            LOG(logERROR, (mess));
+            return FAIL;
+        }
+
+        // user does not allow to fix it (default)
+        if (forceDeleteNormalFile == 0) {
+            sprintf(mess,
+                "Could not %s. The flash drive %s found for fpga programming is a normal file. To "
+                "fix this (by deleting this file, creating the flash drive and proceeding with "
+                "programming), re-run the programming command 'programfpga' with parameter "
+                "'--force-delete-normal-file'\n",
+                messageType, flashDriveName);
+            LOG(logERROR, (mess));
+            return FAIL;
+        }
+        
+        // fpga memory stays after a reboot, user allowed to fix it
+        LOG(logWARNING, ("Flash drive invalidated (normal file). Fixing it...\n"));
+
+        // user allows to fix it, so force delete normal file
+        char cmd[MAX_STR_LENGTH] = {0};
+        char retvals[MAX_STR_LENGTH] = {0};
+
+        if (snprintf(cmd, MAX_STR_LENGTH, "rm %s", flashDriveName) >=
+            MAX_STR_LENGTH) {
+            sprintf(mess,
+                    "Could not update %s. Command to delete normal file %s is "
+                    "too long\n",
+                    messageType, flashDriveName);
+            LOG(logERROR, (mess));
+            return FAIL;
+        }
+        if (executeCommand(cmd, retvals, logDEBUG1) == FAIL) {
+            snprintf(
+                mess, MAX_STR_LENGTH,
+                "Could not update %s. (could not delete normal file %s: %s)\n",
+                messageType, flashDriveName, retvals);
+            LOG(logERROR, (mess));
+            return FAIL;
+        }
+        LOG(logINFO, ("\tDeleted Normal File (%s)\n", flashDriveName));
+
+        // create special drive
+        if (snprintf(cmd, MAX_STR_LENGTH, "%s %s %s",
+                     CMD_CREATE_DEVICE_FILE_PART1, flashDriveName,
+                     CMD_CREATE_DEVICE_FILE_PART2) >= MAX_STR_LENGTH) {
+            sprintf(mess,
+                    "Could not update %s. Command to create special file %s is "
+                    "too long\n",
+                    messageType, flashDriveName);
+            LOG(logERROR, (mess));
+            return FAIL;
+        }
+        if (executeCommand(cmd, retvals, logDEBUG1) == FAIL) {
+            snprintf(
+                mess, MAX_STR_LENGTH,
+                "Could not update %s. (could not create special file %s: %s)\n",
+                messageType, flashDriveName, retvals);
+            LOG(logERROR, (mess));
+            return FAIL;
+        }
+        LOG(logINFO, ("\tSpecial File created (%s)\n", flashDriveName));
+    } else {
+        LOG(logINFO, ("\tValidated flash drive (not a normal file)\n"));
+    }
+#endif
+    return OK;
+}
+
 int eraseFlash(char *mess) {
     LOG(logINFO, ("\tErasing Flash...\n"));
 
diff --git a/slsDetectorServers/slsDetectorServer/src/programViaNios.c b/slsDetectorServers/slsDetectorServer/src/programViaNios.c
index c81598650..fef00ace5 100644
--- a/slsDetectorServers/slsDetectorServer/src/programViaNios.c
+++ b/slsDetectorServers/slsDetectorServer/src/programViaNios.c
@@ -8,6 +8,7 @@
 
 #include <string.h>
 #include <unistd.h> // usleep
+#include <sys/stat.h>
 
 /* global variables */
 
@@ -146,6 +147,30 @@ int getDrive(char *mess, enum PROGRAM_INDEX index) {
 }
 
 int openFileForFlash(char *mess, FILE **flashfd) {
+#ifndef VIRTUAL
+    // check if its a normal file or special file
+    struct stat buf;
+    if (stat(flashDriveName, &buf) == -1) {
+        sprintf(mess,
+                "Could not %s. Unable to find the flash drive %s\n",
+                messageType, flashDriveName);
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+    // zero = normal file (not char drive special file)
+    if (!S_ISCHR(buf.st_mode)) {
+        // memory is not permanent
+        sprintf(mess,
+                "Could not %s. The flash drive found is a normal file. "
+                "Reboot board using 'rebootcontroller' command to load "
+                "proper device tree\n",
+                messageType);
+        LOG(logERROR, (mess));
+        return FAIL;
+    }
+    LOG(logINFO, ("\tValidated flash drive (not a normal file)\n"));
+#endif
+
     *flashfd = fopen(flashDriveName, "w");
     if (*flashfd == NULL) {
         sprintf(mess,
diff --git a/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c b/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
index 796dd4f3f..fc32272ea 100644
--- a/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
+++ b/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
@@ -4003,7 +4003,8 @@ int check_version(int file_des) {
         usleep(3 * 1000 * 1000);
         if (!isInitCheckDone()) {
             ret = FAIL;
-            strcpy(mess, "Server Initialization still not done done in server. Unexpected.\n");
+            strcpy(mess, "Server Initialization still not done done in server. "
+                         "Unexpected.\n");
             LOG(logERROR, (mess));
         }
     }
@@ -9443,6 +9444,15 @@ int receive_program(int file_des, enum PROGRAM_INDEX index) {
             LOG(logINFO, ("\tServer Name: %s\n", serverName));
         }
 
+#if !defined(GOTTHARD2D) && !defined(MYTHEN3D) && !defined(EIGERD)
+        int forceDeleteNormalFile = 0;
+        if (receiveData(file_des, &forceDeleteNormalFile,
+                        sizeof(forceDeleteNormalFile), INT32) < 0)
+            return printSocketReadError();
+        LOG(logINFO,
+            ("\tForce Delete Normal File flag? %s\n", (forceDeleteNormalFile ? "Y" : "N")));
+#endif
+
         // in same folder as current process (will also work for virtual then
         // with write permissions)
         {
@@ -9467,7 +9477,7 @@ int receive_program(int file_des, enum PROGRAM_INDEX index) {
                                     checksum, serverName);
 #else
             receive_program_via_blackfin(file_des, index, functionType,
-                                         filesize, checksum, serverName);
+                                         filesize, checksum, serverName, forceDeleteNormalFile);
 #endif
         }
 
@@ -9483,7 +9493,7 @@ int receive_program(int file_des, enum PROGRAM_INDEX index) {
 
 void receive_program_via_blackfin(int file_des, enum PROGRAM_INDEX index,
                                   char *functionType, uint64_t filesize,
-                                  char *checksum, char *serverName) {
+                                  char *checksum, char *serverName, int forceDeleteNormalFile) {
 
 #if !defined(JUNGFRAUD) && !defined(CHIPTESTBOARDD) && !defined(MOENCHD) &&    \
     !defined(GOTTHARDD)
@@ -9582,7 +9592,7 @@ void receive_program_via_blackfin(int file_des, enum PROGRAM_INDEX index,
     case PROGRAM_FPGA:
     case PROGRAM_KERNEL:
         ret = eraseAndWriteToFlash(mess, index, functionType, checksum,
-                                   totalsize);
+                                   totalsize, forceDeleteNormalFile);
         break;
     case PROGRAM_SERVER:
         ret = moveBinaryFile(mess, serverName, TEMP_PROG_FILE_NAME,
@@ -9785,20 +9795,24 @@ int set_top(int file_des) {
     if (Server_VerifyLock() == OK) {
         if (arg != 0 && arg != 1) {
             ret = FAIL;
-            sprintf(mess, "Could not set top mode. Invalid value: %d. Must be 0 or 1\n", arg);
+            sprintf(
+                mess,
+                "Could not set top mode. Invalid value: %d. Must be 0 or 1\n",
+                arg);
             LOG(logERROR, (mess));
         } else {
             ret = setTop(arg == 1 ? OW_TOP : OW_BOTTOM);
             if (ret == FAIL) {
-                sprintf(mess, "Could not set %s\n", (arg == 1 ? "Top" : "Bottom"));
+                sprintf(mess, "Could not set %s\n",
+                        (arg == 1 ? "Top" : "Bottom"));
                 LOG(logERROR, (mess));
-            } else {            
+            } else {
                 int retval = -1;
                 ret = isTop(&retval);
                 if (ret == FAIL) {
                     strcpy(mess, "Could not get Top mode\n");
                     LOG(logERROR, (mess));
-                } else {                
+                } else {
                     LOG(logDEBUG1, ("retval top: %d\n", retval));
                     validate(&ret, mess, arg, retval, "set top mode", DEC);
                 }
diff --git a/slsDetectorSoftware/include/sls/Detector.h b/slsDetectorSoftware/include/sls/Detector.h
index b935b5a04..68ccbd2a9 100644
--- a/slsDetectorSoftware/include/sls/Detector.h
+++ b/slsDetectorSoftware/include/sls/Detector.h
@@ -1755,10 +1755,13 @@ class Detector {
     /**  [Jungfrau][Gotthard][CTB][Moench][Mythen3][Gotthard2]
      * Advanced user Function!
      * Program firmware from command line, after which detector controller is
-     * rebooted. [Jungfrau][CTB][Moench] fname is a pof file (full path) \n
-     * [Mythen3][Gotthard2] fname is an rbf file (full path)
+     * rebooted. forceDeleteNormalFile is true, if normal file found
+     * in device tree, it must be deleted, a new device drive created and
+     * programming continued.[Jungfrau][CTB][Moench] fname is a pof file (full
+     * path) \n [Mythen3][Gotthard2] fname is an rbf file (full path)
      */
-    void programFPGA(const std::string &fname, Positions pos = {});
+    void programFPGA(const std::string &fname, const bool forceDeleteNormalFile,
+                     Positions pos = {});
 
     /** [Jungfrau][CTB][Moench]  Advanced user Function!  */
     void resetFPGA(Positions pos = {});
diff --git a/slsDetectorSoftware/src/CmdProxy.cpp b/slsDetectorSoftware/src/CmdProxy.cpp
index b75e1fe2d..6b84e770d 100644
--- a/slsDetectorSoftware/src/CmdProxy.cpp
+++ b/slsDetectorSoftware/src/CmdProxy.cpp
@@ -2876,19 +2876,31 @@ std::string CmdProxy::ProgramFpga(int action) {
     std::ostringstream os;
     os << cmd << ' ';
     if (action == defs::HELP_ACTION) {
-        os << "[fname.pof | fname.rbf (full path)]\n\t[Jungfrau][Ctb][Moench] "
-              "Programs FPGA from pof file (full path). Then, detector "
-              "controller is rebooted \n\t[Mythen3][Gotthard2] Programs FPGA "
-              "from rbf file (full path). Then, detector controller is "
-              "rebooted."
+        os << "[fname.pof | fname.rbf (full "
+              "path)][(opitonal)--force-delete-normal-file]\n\t[Jungfrau][Ctb]["
+              "Moench] Programs FPGA from pof file (full path). Then, detector "
+              "controller is rebooted. \n\t\tUse --force-delete-normal-file "
+              "argument, if normal file found in device tree, it must be "
+              "deleted, a new device drive created and programming "
+              "continued.\n\t[Mythen3][Gotthard2] Programs FPGA from rbf file "
+              "(full path). Then, detector controller is rebooted."
            << '\n';
     } else if (action == defs::GET_ACTION) {
         throw sls::RuntimeError("Cannot get");
     } else if (action == defs::PUT_ACTION) {
-        if (args.size() != 1) {
+        bool forceDeteleNormalFile = false;
+        if (args.size() == 2) {
+            if (args[1] != "--force-delete-normal-file") {
+                throw sls::RuntimeError(
+                    "Could not scan second argument. Did you "
+                    "mean --force-delete-normal-file?");
+            }
+            forceDeteleNormalFile = true;
+        } else if (args.size() != 1) {
             WrongNumberOfParameters(1);
         }
-        det->programFPGA(args[0], std::vector<int>{det_id});
+        det->programFPGA(args[0], forceDeteleNormalFile,
+                         std::vector<int>{det_id});
         os << "successful\n";
     } else {
         throw sls::RuntimeError("Unknown action");
diff --git a/slsDetectorSoftware/src/Detector.cpp b/slsDetectorSoftware/src/Detector.cpp
index 150263f5f..74447566d 100644
--- a/slsDetectorSoftware/src/Detector.cpp
+++ b/slsDetectorSoftware/src/Detector.cpp
@@ -883,7 +883,7 @@ Result<std::string> Detector::getScanErrorMessage(Positions pos) const {
 
 Result<int> Detector::getNumberofUDPInterfaces(Positions pos) const {
     // also called by vetostream (for gotthard2)
-    return pimpl->getNumberofUDPInterfaces(pos);
+    return pimpl->Parallel(&Module::getNumberofUDPInterfacesFromShm, pos);
 }
 
 void Detector::setNumberofUDPInterfaces(int n, Positions pos) {
@@ -1751,7 +1751,7 @@ Result<defs::streamingInterface> Detector::getVetoStream(Positions pos) const {
     // 3gbe
     auto r3 = pimpl->Parallel(&Module::getVetoStream, pos);
     // 10gbe (debugging interface) opens 2nd udp interface in receiver
-    auto r10 = pimpl->getNumberofUDPInterfaces(pos);
+    auto r10 = getNumberofUDPInterfaces(pos);
 
     Result<defs::streamingInterface> res(r3.size());
     for (unsigned int i = 0; i < res.size(); ++i) {
@@ -1773,7 +1773,7 @@ void Detector::setVetoStream(defs::streamingInterface interface,
     pimpl->Parallel(&Module::setVetoStream, pos, LOW_LATENCY_LINK);
 
     // 10gbe (debugging interface) opens 2nd udp interface in receiver
-    int old_numinterfaces = pimpl->getNumberofUDPInterfaces(pos).tsquash(
+    int old_numinterfaces = getNumberofUDPInterfaces(pos).tsquash(
         "retrieved inconsistent number of udp interfaces");
     int numinterfaces =
         (((interface & defs::streamingInterface::ETHERNET_10GB) ==
@@ -2230,10 +2230,11 @@ void Detector::setAdditionalJsonParameter(const std::string &key,
 
 // Advanced
 
-void Detector::programFPGA(const std::string &fname, Positions pos) {
+void Detector::programFPGA(const std::string &fname,
+                           const bool forceDeleteNormalFile, Positions pos) {
     LOG(logINFO) << "Updating Firmware...";
     std::vector<char> buffer = pimpl->readProgrammingFile(fname);
-    pimpl->Parallel(&Module::programFPGA, pos, buffer);
+    pimpl->Parallel(&Module::programFPGA, pos, buffer, forceDeleteNormalFile);
     rebootController(pos);
 }
 
@@ -2278,7 +2279,7 @@ void Detector::updateFirmwareAndServer(const std::string &sname,
     LOG(logINFO) << "Updating Firmware and Detector Server (with tftp)...";
     LOG(logINFO) << "Updating Detector Server (via tftp)...";
     pimpl->Parallel(&Module::copyDetectorServer, pos, sname, hostname);
-    programFPGA(fname, pos);
+    programFPGA(fname, false, pos);
 }
 
 void Detector::updateFirmwareAndServer(const std::string &sname,
@@ -2289,7 +2290,7 @@ void Detector::updateFirmwareAndServer(const std::string &sname,
     std::vector<char> buffer = readBinaryFile(sname, "Update Detector Server");
     std::string filename = sls::getFileNameFromFilePath(sname);
     pimpl->Parallel(&Module::updateDetectorServer, pos, buffer, filename);
-    programFPGA(fname, pos);
+    programFPGA(fname, false, pos);
 }
 
 Result<bool> Detector::getUpdateMode(Positions pos) const {
@@ -2399,7 +2400,7 @@ Result<ns> Detector::getMeasurementTime(Positions pos) const {
 std::string Detector::getUserDetails() const { return pimpl->getUserDetails(); }
 
 std::vector<int> Detector::getPortNumbers(int start_port) {
-    int num_sockets_per_detector = pimpl->getNumberofUDPInterfaces({}).tsquash(
+    int num_sockets_per_detector = getNumberofUDPInterfaces({}).tsquash(
         "Number of UDP Interfaces is not consistent among modules");
     std::vector<int> res;
     res.reserve(size());
diff --git a/slsDetectorSoftware/src/DetectorImpl.cpp b/slsDetectorSoftware/src/DetectorImpl.cpp
index aa169fdb2..7e8aa1719 100644
--- a/slsDetectorSoftware/src/DetectorImpl.cpp
+++ b/slsDetectorSoftware/src/DetectorImpl.cpp
@@ -32,7 +32,8 @@
 namespace sls {
 
 DetectorImpl::DetectorImpl(int detector_index, bool verify, bool update)
-    : detectorIndex(detector_index), shm(detector_index, -1),ctb_shm(detector_index, -1, CtbConfig::shm_tag()) {
+    : detectorIndex(detector_index), shm(detector_index, -1),
+      ctb_shm(detector_index, -1, CtbConfig::shm_tag()) {
     setupDetector(verify, update);
 }
 
@@ -44,7 +45,7 @@ void DetectorImpl::setupDetector(bool verify, bool update) {
     if (update) {
         updateUserdetails();
     }
-    
+
     if (ctb_shm.IsExisting())
         ctb_shm.OpenSharedMemory();
 }
@@ -94,7 +95,7 @@ void DetectorImpl::freeSharedMemory() {
     shm.RemoveSharedMemory();
     client_downstream = false;
 
-    if(ctb_shm.IsExisting())
+    if (ctb_shm.IsExisting())
         ctb_shm.RemoveSharedMemory();
 }
 
@@ -155,7 +156,7 @@ void DetectorImpl::initSharedMemory(bool verify) {
         }
     }
 
-    // std::cout << 
+    // std::cout <<
 }
 
 void DetectorImpl::initializeDetectorStructure() {
@@ -258,20 +259,11 @@ void DetectorImpl::setHostname(const std::vector<std::string> &name) {
     }
     updateDetectorSize();
 
-    // update zmq port (especially for eiger)
-    int numInterfaces = modules[0]->getNumberofUDPInterfaces();
-    if (numInterfaces == 2) {
-        for (size_t i = 0; i < modules.size(); ++i) {
-            modules[i]->setClientStreamingPort(DEFAULT_ZMQ_CL_PORTNO +
-                                               i * numInterfaces);
-        }
-    }
+    // Here we know the detector type and can add ctb shared memory
+    // if needed, CTB dac names are only on detector level
 
-    //Here we know the detector type and can add ctb shared memory 
-    //if needed, CTB dac names are only on detector level
-
-    if (shm()->detType == defs::CHIPTESTBOARD){
-        if(ctb_shm.IsExisting())
+    if (shm()->detType == defs::CHIPTESTBOARD) {
+        if (ctb_shm.IsExisting())
             ctb_shm.OpenSharedMemory();
         else
             ctb_shm.CreateSharedMemory();
@@ -303,6 +295,13 @@ void DetectorImpl::addModule(const std::string &hostname) {
 
     // get type by connecting
     detectorType type = Module::getTypeFromDetector(host, port);
+
+    // gotthard cannot have more than 2 modules (50um=1, 25um=2
+    if ((type == GOTTHARD || type == GOTTHARD2) && modules.size() > 2) {
+        freeSharedMemory();
+        throw sls::RuntimeError("Gotthard cannot have more than 2 modules");
+    }
+
     auto pos = modules.size();
     modules.emplace_back(
         sls::make_unique<Module>(type, detectorIndex, pos, false));
@@ -310,11 +309,20 @@ void DetectorImpl::addModule(const std::string &hostname) {
     modules[pos]->setControlPort(port);
     modules[pos]->setStopPort(port + 1);
     modules[pos]->setHostname(host, shm()->initialChecks);
+
     // module type updated by now
     shm()->detType = Parallel(&Module::getDetectorType, {})
                          .tsquash("Inconsistent detector types.");
     // for moench and ctb
     modules[pos]->updateNumberOfChannels();
+
+    // for eiger, jungfrau, gotthard2
+    modules[pos]->updateNumberofUDPInterfaces();
+
+    // update zmq port in case numudpinterfaces changed
+    int numInterfaces = modules[pos]->getNumberofUDPInterfacesFromShm();
+    modules[pos]->setClientStreamingPort(DEFAULT_ZMQ_CL_PORTNO +
+                                         pos * numInterfaces);
 }
 
 void DetectorImpl::updateDetectorSize() {
@@ -1383,10 +1391,6 @@ std::vector<char> DetectorImpl::readProgrammingFile(const std::string &fname) {
     return buffer;
 }
 
-sls::Result<int> DetectorImpl::getNumberofUDPInterfaces(Positions pos) const {
-    return Parallel(&Module::getNumberofUDPInterfaces, pos);
-}
-
 sls::Result<int> DetectorImpl::getDefaultDac(defs::dacIndex index,
                                              defs::detectorSettings sett,
                                              Positions pos) {
@@ -1398,16 +1402,15 @@ void DetectorImpl::setDefaultDac(defs::dacIndex index, int defaultValue,
     Parallel(&Module::setDefaultDac, pos, index, defaultValue, sett);
 }
 
-
 std::vector<std::string> DetectorImpl::getCtbDacNames() const {
     return ctb_shm()->getDacNames();
 }
 
-void DetectorImpl::setCtbDacNames(const std::vector<std::string>& names){
+void DetectorImpl::setCtbDacNames(const std::vector<std::string> &names) {
     ctb_shm()->setDacNames(names);
 }
 
-std::string DetectorImpl::getCtbDacName(defs::dacIndex i) const{
+std::string DetectorImpl::getCtbDacName(defs::dacIndex i) const {
     return ctb_shm()->getDacName(static_cast<int>(i));
 }
 
diff --git a/slsDetectorSoftware/src/DetectorImpl.h b/slsDetectorSoftware/src/DetectorImpl.h
index d30743da2..92d364556 100644
--- a/slsDetectorSoftware/src/DetectorImpl.h
+++ b/slsDetectorSoftware/src/DetectorImpl.h
@@ -293,7 +293,6 @@ class DetectorImpl : public virtual slsDetectorDefs {
      */
     std::vector<char> readProgrammingFile(const std::string &fname);
 
-    sls::Result<int> getNumberofUDPInterfaces(Positions pos) const;
     void setNumberofUDPInterfaces(int n, Positions pos);
     sls::Result<int> getDefaultDac(defs::dacIndex index,
                                    defs::detectorSettings sett,
diff --git a/slsDetectorSoftware/src/Module.cpp b/slsDetectorSoftware/src/Module.cpp
index 49cff9b83..5555ec71f 100644
--- a/slsDetectorSoftware/src/Module.cpp
+++ b/slsDetectorSoftware/src/Module.cpp
@@ -976,9 +976,8 @@ int Module::getNumberofUDPInterfacesFromShm() const {
     return shm()->numUDPInterfaces;
 }
 
-int Module::getNumberofUDPInterfaces() const {
+void Module::updateNumberofUDPInterfaces() {
     shm()->numUDPInterfaces = sendToDetector<int>(F_GET_NUM_INTERFACES);
-    return shm()->numUDPInterfaces;
 }
 
 void Module::setNumberofUDPInterfaces(int n) {
@@ -1186,7 +1185,7 @@ std::string Module::printReceiverConfiguration() {
        << getReceiverHostname();
 
     if (shm()->detType == JUNGFRAU) {
-        os << "\nNumber of Interfaces:\t" << getNumberofUDPInterfaces()
+        os << "\nNumber of Interfaces:\t" << getNumberofUDPInterfacesFromShm()
            << "\nSelected Interface:\t" << getSelectedUDPInterface();
     }
 
@@ -2591,12 +2590,14 @@ void Module::setAdditionalJsonParameter(const std::string &key,
 }
 
 // Advanced
-void Module::programFPGA(std::vector<char> buffer) {
+void Module::programFPGA(std::vector<char> buffer,
+                         const bool forceDeleteNormalFile) {
     switch (shm()->detType) {
     case JUNGFRAU:
     case CHIPTESTBOARD:
     case MOENCH:
-        sendProgram(true, buffer, F_PROGRAM_FPGA, "Update Firmware");
+        sendProgram(true, buffer, F_PROGRAM_FPGA, "Update Firmware", "",
+                    forceDeleteNormalFile);
         break;
     case MYTHEN3:
     case GOTTHARD2:
@@ -3219,10 +3220,10 @@ void Module::initializeModuleStructure(detectorType type) {
     sls::strcpy_safe(shm()->rxHostname, "none");
     shm()->rxTCPPort = DEFAULT_PORTNO + 2;
     shm()->useReceiverFlag = false;
+    shm()->numUDPInterfaces = 1;
     shm()->zmqport =
         DEFAULT_ZMQ_CL_PORTNO + moduleIndex * shm()->numUDPInterfaces;
     shm()->zmqip = IpAddr{};
-    shm()->numUDPInterfaces = 1;
     shm()->stoppedFlag = false;
 
     // get the Module parameters based on type
@@ -3583,7 +3584,8 @@ sls_detector_module Module::readSettingsFile(const std::string &fname,
 void Module::sendProgram(bool blackfin, std::vector<char> buffer,
                          const int functionEnum,
                          const std::string &functionType,
-                         const std::string serverName) {
+                         const std::string serverName,
+                         const bool forceDeleteNormalFile) {
     LOG(logINFO) << "Module " << moduleIndex << " (" << shm()->hostname
                  << "): Sending " << functionType;
 
@@ -3607,6 +3609,11 @@ void Module::sendProgram(bool blackfin, std::vector<char> buffer,
         client.Send(sname);
     }
 
+    // send forceDeleteNormalFile flag
+    if (blackfin) {
+        client.Send(static_cast<int>(forceDeleteNormalFile));
+    }
+
     // validate memory allocation etc in detector
     if (client.Receive<int>() == FAIL) {
         std::ostringstream os;
diff --git a/slsDetectorSoftware/src/Module.h b/slsDetectorSoftware/src/Module.h
index 0529773cd..fe5c5f5b3 100644
--- a/slsDetectorSoftware/src/Module.h
+++ b/slsDetectorSoftware/src/Module.h
@@ -219,7 +219,7 @@ class Module : public virtual slsDetectorDefs {
      *                                                 *
      * ************************************************/
     int getNumberofUDPInterfacesFromShm() const;
-    int getNumberofUDPInterfaces() const;
+    void updateNumberofUDPInterfaces();
     void setNumberofUDPInterfaces(int n);
     int getSelectedUDPInterface() const;
     void selectUDPInterface(int n);
@@ -545,7 +545,8 @@ class Module : public virtual slsDetectorDefs {
      *    Advanced                                    *
      *                                                *
      * ************************************************/
-    void programFPGA(std::vector<char> buffer);
+    void programFPGA(std::vector<char> buffer,
+                     const bool forceDeleteNormalFile);
     void resetFPGA();
     void copyDetectorServer(const std::string &fname,
                             const std::string &hostname);
@@ -760,7 +761,8 @@ class Module : public virtual slsDetectorDefs {
                                          bool trimbits = true);
     void sendProgram(bool blackfin, std::vector<char> buffer,
                      const int functionEnum, const std::string &functionType,
-                     const std::string serverName = "");
+                     const std::string serverName = "",
+                     const bool forceDeleteNormalFile = false);
     void simulatingActivityinDetector(const std::string &functionType,
                                       const int timeRequired);
 
diff --git a/slsReceiverSoftware/src/DataProcessor.cpp b/slsReceiverSoftware/src/DataProcessor.cpp
index e4426aafb..a22abdfc1 100644
--- a/slsReceiverSoftware/src/DataProcessor.cpp
+++ b/slsReceiverSoftware/src/DataProcessor.cpp
@@ -200,7 +200,10 @@ void DataProcessor::CreateVirtualFile(
     if (virtualFile_) {
         delete virtualFile_;
     }
-    virtualFile_ = new HDF5VirtualFile(hdf5Lib);
+    bool gotthard25um =
+        ((detectorType_ == GOTTHARD || detectorType_ == GOTTHARD2) &&
+         (numModX * numModY) == 2);
+    virtualFile_ = new HDF5VirtualFile(hdf5Lib, gotthard25um);
 
     // maxframesperfile = 0 for infinite files
     uint32_t framesPerFile =
@@ -214,7 +217,7 @@ void DataProcessor::CreateVirtualFile(
         filePath, fileNamePrefix, fileIndex, overWriteEnable, silentMode,
         modulePos, numUnitsPerReadout, framesPerFile, numImages,
         generalData_->nPixelsX, generalData_->nPixelsY, dynamicRange,
-        numImagesProcessed, numModX, numModY, dataFile_->GetPDataType(),
+        numFramesCaught_, numModX, numModY, dataFile_->GetPDataType(),
         dataFile_->GetParameterNames(), dataFile_->GetParameterDataTypes());
 }
 
diff --git a/slsReceiverSoftware/src/HDF5VirtualFile.cpp b/slsReceiverSoftware/src/HDF5VirtualFile.cpp
index 71ef51099..015ad0ae3 100644
--- a/slsReceiverSoftware/src/HDF5VirtualFile.cpp
+++ b/slsReceiverSoftware/src/HDF5VirtualFile.cpp
@@ -5,8 +5,8 @@
 
 #include <iomanip>
 
-HDF5VirtualFile::HDF5VirtualFile(std::mutex *hdf5Lib)
-    : File(HDF5), hdf5Lib_(hdf5Lib) {}
+HDF5VirtualFile::HDF5VirtualFile(std::mutex *hdf5Lib, bool g25)
+    : File(HDF5), hdf5Lib_(hdf5Lib), gotthard25um(g25) {}
 
 HDF5VirtualFile::~HDF5VirtualFile() { CloseFile(); }
 
@@ -73,12 +73,10 @@ void HDF5VirtualFile::CreateVirtualFile(
             "version", PredType::NATIVE_DOUBLE, dataspace_attr);
         attribute.write(PredType::NATIVE_DOUBLE, &dValue);
 
-        // virtual data dataspace
+        // virtual dataspace
         hsize_t vdsDims[3] = {numImagesCaught, numModY * nDimy,
                               numModZ * nDimz};
         DataSpace vdsDataSpace(3, vdsDims, nullptr);
-
-        // virtual parameter dataspace
         hsize_t vdsDimsPara[2] = {numImagesCaught,
                                   (unsigned int)numModY * numModZ};
         DataSpace vdsDataSpacePara(2, vdsDimsPara, nullptr);
@@ -91,37 +89,54 @@ void HDF5VirtualFile::CreateVirtualFile(
         // property list for parameters (datatype)
         std::vector<DSetCreatPropList> plistPara(paraSize);
 
-        // hyperslab
-        int numMajorHyperslab = numImagesCaught / maxFramesPerFile;
+        // hyperslab (files)
+        int numFiles = numImagesCaught / maxFramesPerFile;
         if (numImagesCaught % maxFramesPerFile)
-            ++numMajorHyperslab;
+            ++numFiles;
         uint64_t framesSaved = 0;
-        // loop through files
-        for (int hyperSlab = 0; hyperSlab < numMajorHyperslab; ++hyperSlab) {
+        for (int iFile = 0; iFile < numFiles; ++iFile) {
 
             uint64_t nDimx =
                 ((numImagesCaught - framesSaved) > maxFramesPerFile)
                     ? maxFramesPerFile
                     : (numImagesCaught - framesSaved);
-            hsize_t start[3] = {framesSaved, 0, 0};
-            hsize_t count[3] = {nDimx, nDimy, nDimz};
-            hsize_t startPara[2] = {framesSaved, 0};
-            hsize_t countPara[2] = {nDimx, 1};
-            // loop through readouts
-            for (unsigned int i = 0; i < numModY * numModZ; ++i) {
 
-                // setect data hyperslabs
-                vdsDataSpace.selectHyperslab(H5S_SELECT_SET, count, start);
+            hsize_t startLocation[3] = {framesSaved, 0, 0};
+            hsize_t strideBetweenBlocks[3] = {1, 1, 1};
+            hsize_t numBlocks[3] = {nDimx, nDimy, nDimz};
+            hsize_t blockSize[3] = {1, 1, 1};
 
-                // select parameter hyperslabs
-                vdsDataSpacePara.selectHyperslab(H5S_SELECT_SET, countPara,
-                                                 startPara);
+            hsize_t startLocationPara[2] = {framesSaved, 0};
+            hsize_t strideBetweenBlocksPara[3] = {1, 1};
+            hsize_t numBlocksPara[2] = {1, 1};
+            hsize_t blockSizePara[3] = {nDimx, 1};
+
+            // interleaving for g2
+            if (gotthard25um) {
+                strideBetweenBlocks[2] = 2;
+            }
+
+            for (unsigned int iReadout = 0; iReadout < numModY * numModZ;
+                 ++iReadout) {
+
+                // interleaving for g2 (startLocation is 0 and 1)
+                if (gotthard25um) {
+                    startLocation[2] = iReadout;
+                }
+
+                vdsDataSpace.selectHyperslab(H5S_SELECT_SET, numBlocks,
+                                             startLocation, strideBetweenBlocks,
+                                             blockSize);
+
+                vdsDataSpacePara.selectHyperslab(
+                    H5S_SELECT_SET, numBlocksPara, startLocationPara,
+                    strideBetweenBlocksPara, blockSizePara);
 
                 // source file name
                 std::ostringstream os;
                 os << filePath << "/" << fileNamePrefix << "_d"
-                   << (modulePos * numUnitsPerReadout + i) << "_f" << hyperSlab
-                   << '_' << fileIndex << ".h5";
+                   << (modulePos * numUnitsPerReadout + iReadout) << "_f"
+                   << iFile << '_' << fileIndex << ".h5";
                 std::string srcFileName = os.str();
                 LOG(logDEBUG1) << srcFileName;
 
@@ -138,25 +153,20 @@ void HDF5VirtualFile::CreateVirtualFile(
                 std::ostringstream osfn;
                 osfn << "/data";
                 if (numImages > 1)
-                    osfn << "_f" << std::setfill('0') << std::setw(12)
-                         << hyperSlab;
+                    osfn << "_f" << std::setfill('0') << std::setw(12) << iFile;
                 std::string srcDatasetName = osfn.str();
 
-                // source data dataspace
+                // source dataspace
                 hsize_t srcDims[3] = {nDimx, nDimy, nDimz};
                 hsize_t srcDimsMax[3] = {H5S_UNLIMITED, nDimy, nDimz};
                 DataSpace srcDataSpace(3, srcDims, srcDimsMax);
-
-                // source parameter dataspace
                 hsize_t srcDimsPara[1] = {nDimx};
                 hsize_t srcDimsMaxPara[1] = {H5S_UNLIMITED};
                 DataSpace srcDataSpacePara(1, srcDimsPara, srcDimsMaxPara);
 
-                // mapping of data property list
+                // mapping of property list
                 plist.setVirtual(vdsDataSpace, relative_srcFileName.c_str(),
                                  srcDatasetName.c_str(), srcDataSpace);
-
-                // mapping of parameter property list
                 for (unsigned int p = 0; p < paraSize; ++p) {
                     plistPara[p].setVirtual(
                         vdsDataSpacePara, relative_srcFileName.c_str(),
@@ -165,21 +175,23 @@ void HDF5VirtualFile::CreateVirtualFile(
 
                 // H5Sclose(srcDataspace);
                 // H5Sclose(srcDataspace_para);
-                start[2] += nDimz;
-                if (start[2] >= (numModZ * nDimz)) {
-                    start[2] = 0;
-                    start[1] += nDimy;
+
+                if (!gotthard25um) {
+                    startLocation[2] += nDimz;
+                    if (startLocation[2] >= (numModZ * nDimz)) {
+                        startLocation[2] = 0;
+                        startLocation[1] += nDimy;
+                    }
                 }
-                startPara[1]++;
+                startLocationPara[1]++;
             }
             framesSaved += nDimx;
         }
-        // data dataset
+        // datasets
         dataSetName_ = "data";
         DataSet vdsDataSet(fd_->createDataSet(dataSetName_.c_str(), dataType,
                                               vdsDataSpace, plist));
 
-        // parameter dataset
         for (unsigned int p = 0; p < paraSize; ++p) {
             DataSet vdsDataSetPara(fd_->createDataSet(
                 parameterNames[p].c_str(), parameterDataTypes[p],
@@ -196,4 +208,4 @@ void HDF5VirtualFile::CreateVirtualFile(
     if (!silentMode) {
         LOG(logINFO) << "Virtual File: " << fileName_;
     }
-}
\ No newline at end of file
+}
diff --git a/slsReceiverSoftware/src/HDF5VirtualFile.h b/slsReceiverSoftware/src/HDF5VirtualFile.h
index a479bce2d..89b1c0b60 100644
--- a/slsReceiverSoftware/src/HDF5VirtualFile.h
+++ b/slsReceiverSoftware/src/HDF5VirtualFile.h
@@ -9,7 +9,7 @@
 class HDF5VirtualFile : private virtual slsDetectorDefs, public File {
 
   public:
-    HDF5VirtualFile(std::mutex *hdf5Lib);
+    HDF5VirtualFile(std::mutex *hdf5Lib, bool g25);
     ~HDF5VirtualFile();
 
     std::array<std::string, 2> GetFileAndDatasetName() const override;
@@ -30,4 +30,5 @@ class HDF5VirtualFile : private virtual slsDetectorDefs, public File {
     H5File *fd_{nullptr};
     std::string fileName_;
     std::string dataSetName_;
+    bool gotthard25um;
 };
\ No newline at end of file
diff --git a/slsSupportLib/include/sls/versionAPI.h b/slsSupportLib/include/sls/versionAPI.h
index 04645699b..71b44521d 100644
--- a/slsSupportLib/include/sls/versionAPI.h
+++ b/slsSupportLib/include/sls/versionAPI.h
@@ -6,10 +6,10 @@
 #define APIRECEIVER 0x211124
 #define APIGUI 0x211124
 
-#define APICTB 0x220318
-#define APIGOTTHARD 0x220318
-#define APIGOTTHARD2 0x220318
-#define APIJUNGFRAU 0x220318
-#define APIMYTHEN3 0x220318
-#define APIMOENCH 0x220318
-#define APIEIGER 0x220318
+#define APIEIGER 0x220324
+#define APICTB 0x220328
+#define APIGOTTHARD 0x220328
+#define APIGOTTHARD2 0x220328
+#define APIJUNGFRAU 0x220328
+#define APIMYTHEN3 0x220328
+#define APIMOENCH 0x220328