diff --git a/rpi/mass-storage-gadget64/boot.img b/rpi/mass-storage-gadget64/boot.img
index efaeea6..20cbb81 100644
Binary files a/rpi/mass-storage-gadget64/boot.img and b/rpi/mass-storage-gadget64/boot.img differ
diff --git a/rpi/mass-storage-gadget64/bootfiles.bin b/rpi/mass-storage-gadget64/bootfiles.bin
deleted file mode 100644
index 7035a17..0000000
Binary files a/rpi/mass-storage-gadget64/bootfiles.bin and /dev/null differ
diff --git a/rpi/mass-storage-gadget64/bootfiles.bin b/rpi/mass-storage-gadget64/bootfiles.bin
new file mode 120000
index 0000000..f9b98a3
--- /dev/null
+++ b/rpi/mass-storage-gadget64/bootfiles.bin
@@ -0,0 +1 @@
+../firmware/bootfiles.bin
\ No newline at end of file
diff --git a/rpi/rpiboot b/rpi/rpiboot
index c62da6d..f0bce5d 100755
Binary files a/rpi/rpiboot and b/rpi/rpiboot differ
diff --git a/rpi/write_to b/rpi/write_to
index 59fe3e6..7b061cf 100755
--- a/rpi/write_to
+++ b/rpi/write_to
@@ -43,53 +43,46 @@ class HostSystem:
 
 
 class Linux(HostSystem):
-    rescue = """
-    Remark: not all cables might work.
-    Example on Markus Mac:
-    - does not work: black USB C to USB C cable
-    - works: white USB A to USB C cable plugged into docking station.
-
-    Please unpower the box with compute module,
-    start this script again and put power immediately."""
+    rescue = ""
+    usbbootdir = os.path.expanduser('~/usbboot')
 
     def get_disks(self):
         return [line for line in cmd('lsblk -d').split('\n') if line]
 
     def rpiboot(self):
-        lines = []
-        with Popen(['sudo', './rpiboot', '-d', 'mass-storage-gadget64'], stdout=PIPE) as p:
+        msg = '\nswitch device power on now'
+        with Popen(['sudo', f'{self.usbbootdir}/rpiboot', '-d', f'{self.usbbootdir}/mass-storage-gadget64'], stdout=PIPE) as p:
             tmo = 1
-            t = 0
             while select([p.stdout], [], [], tmo)[0]:
                 rawline = p.stdout.readline()
                 if not rawline:
                     return tmo != 1
                 line = rawline.decode('latin-1').strip()
                 print(line)
-                if lines is None:
-                    pass # print(line)
-                elif 'Waiting' in line:
+                if 'Waiting' in line:
                     tmo = 30
-                    lines.append(line)
-                    t = time.time()
-                elif tmo == 1:
-                    lines.append(line)
-                else:
-                    print('\n'.join(lines))
-                    print(line)
-                    lines = None
+                    if msg:
+                        print(msg)
+                        msg = None
             else:
                 p.terminate()
                 return False
 
     def find_raspi(self):
-        input('make sure device is not connected [confirm]')
         prevset = set(self.get_disks())
-        input('now connect [confirm]')
-        disks = self.wait_disks(prevset, 5)
+        short = {v.split()[0] for v in prevset}
+        if short != {'mmcblk0boot1', 'mmcblk0boot0', 'mmcblk0', 'NAME'}:
+            # not the disks we typically have on a dual-eth-rpi
+            input('make sure device is not powered [confirm]')
+            prevset = set(self.get_disks())
+        if self.kind in EMMC:  # need rpiboot
+            disks = None
+        else:
+            input('now connect the device [confirm]')
+            disks = self.wait_disks(prevset, 5)
         if not disks:
             print('can not yet detect disk, try to run rpiboot')
-            print('if is blocked at "Waiting for BCM...", turn off and on power of target rpi')
+            input('\nconnect the device with power off [confirm]')
             # cmd('sudo ./rpiboot -d mass-storage-gadget64')
             self.rpiboot()
             disks = self.wait_disks(prevset, 15)
@@ -111,6 +104,10 @@ class Linux(HostSystem):
         return None
 
     def write_image(self):
+        if not os.path.exists(self.usbbootdir):
+            print(f'please install the usbboot directory at {self.usbbootdir}')
+            return
+        print('troubleshooting: install newest version of usbboot')
         proposed = [v.split()[0] for v in self.find_raspi()]
         self.list_external()
         if len(proposed) == 1:
@@ -135,7 +132,7 @@ class Linux(HostSystem):
         print('you may be prompted for your account password for sudo')
         os.system(f'sudo umount /dev/{dev}')
         print('')
-        prt('get, uncompress and write... (takes about 15 min)')
+        prt('get, uncompress and write... (takes about 20-30 min)')
         os.system(f'ssh {IMAGES_HOST} "dd if={self.imgdir}/{image} bs=512k" | lz4 -d | sudo dd of=/dev/{dev} bs=512k')
         prt('unmount bootfs')
         for _ in range(3):