diff --git a/RELEASE.txt b/RELEASE.txt
index d3d7b9f0b..084fe219a 100644
--- a/RELEASE.txt
+++ b/RELEASE.txt
@@ -28,6 +28,25 @@ This document describes the differences between v9.1.0 and v9.0.0
 =====================================
 
 
+
+1.1 New or Changed Features
+============================
+
+
+
+1.2 Resolved Features 
+======================
+
+
+    Client
+    -------
+
+
+    *   Command line - Multi detector index inside file
+        Multi detector index '[index]-' was ignored silently in the config/parameter
+        file since 5.0.0. Now, it will throw an exception. Please use the multi
+        detector index on the 'config' or 'parameter' command instead.
+
  
 
 
@@ -35,12 +54,12 @@ This document describes the differences between v9.1.0 and v9.0.0
 ==========================================
 
 
-    Eiger       9.1.0
+    Eiger       9.0.0
     Jungfrau    9.1.0
-    Mythen3     9.1.0
-    Gotthard2   9.1.0
-    Gotthard    9.1.0
-    Moench      9.1.0
+    Mythen3     9.0.0
+    Gotthard2   9.0.0
+    Gotthard    9.0.0
+    Moench      9.0.0
   
 
     On-board Detector Server Upgrade
diff --git a/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServerv9.1.0 b/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServerv9.1.0
deleted file mode 100755
index d7a9dee61..000000000
Binary files a/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServerv9.1.0 and /dev/null differ
diff --git a/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServerv9.1.0 b/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServerv9.1.0
deleted file mode 100755
index 582a1c24f..000000000
Binary files a/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServerv9.1.0 and /dev/null differ
diff --git a/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServerv9.1.0 b/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServerv9.1.0
deleted file mode 100755
index 1ed9bf717..000000000
Binary files a/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServerv9.1.0 and /dev/null differ
diff --git a/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServerv9.1.0 b/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServerv9.1.0
deleted file mode 100755
index 924c6fa65..000000000
Binary files a/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServerv9.1.0 and /dev/null differ
diff --git a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServerv9.1.0 b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServerv9.1.0
deleted file mode 100755
index 238fbe0ce..000000000
Binary files a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServerv9.1.0 and /dev/null differ
diff --git a/slsSupportLib/include/sls/versionAPI.h b/slsSupportLib/include/sls/versionAPI.h
index bb8f6d317..7ef5581fb 100644
--- a/slsSupportLib/include/sls/versionAPI.h
+++ b/slsSupportLib/include/sls/versionAPI.h
@@ -1,13 +1,13 @@
 // SPDX-License-Identifier: LGPL-3.0-or-other
 // Copyright (C) 2021 Contributors to the SLS Detector Package
 /** API versions */
+#define APIGOTTHARD  "9.0.0 0x241121"
+#define APIGOTTHARD2 "9.0.0 0x241121"
+#define APIMYTHEN3   "9.0.0 0x241121"
+#define APIMOENCH    "9.0.0 0x241121"
+#define APIEIGER     "9.0.0 0x241121"
 #define APILIB       "9.1.0 0x250204"
 #define APIRECEIVER  "9.1.0 0x250204"
 #define APICTB       "9.1.0 0x250204"
-#define APIGOTTHARD  "9.1.0 0x250204"
-#define APIGOTTHARD2 "9.1.0 0x250204"
-#define APIMYTHEN3   "9.1.0 0x250204"
-#define APIMOENCH    "9.1.0 0x250204"
 #define APIXILINXCTB "9.1.0 0x250204"
-#define APIEIGER     "9.1.0 0x250204"
 #define APIJUNGFRAU  "9.1.0 0x250224"