add nitrokey3 update in qubes

nitrokey3/linux/firmware-update-qubes.rst

@@ -0,0 +1,38 @@
+Firmware Update With Qubes OS
+=============================
+
+.. only:: comment
+
+ .. contents:: :local:
+
+This guide describes how to update Nitrokey 3's firmware with nitropy in Qubes OS. 
+
+.. important:: 
+   please read the general `firmware update instructions`_ before! Since for specifc versions there are limitations regarding what data is possible to migrate to the new version. 
+
+.. _firmware update instructions: ./firmware-update.html
+
+
+Setup
+-----
+
+Install nitropy in a app VM of your choice following the `installation instructions`_.
+
+.. _installation instructions: ../../software/nitropy/all-platforms/installation.html
+
+
+How to Update
+-------------
+
+.. important::
+   Never disconnect the Nitrokey 3 or abort the process while updating,
+   because it will likely render your device unusable!
+
+1. Run ``nitropy nk3 reboot --bootloader`` in app VM.
+2. Once instructed by ``nitropy`` touch the device to activate the bootloader.
+3. This will detach the nitrokey from the app VM, and the bootloader will apear in sys-usb 
+4. Attach the bootloader to the app VM 
+5. Run ``nitropy nk3 update`` and follow the instructions. This will reboot the Nitrokey to finalice the update eventually.
+6. Re-attach the Nitrokey back to th app VM
+
+In case of any errors please take the logs from ``/tmp`` directory (``/tmp/nitropy.log.*``).