I pointed to it because of potential similarities.
If you are lucky it is just corruption of btrfs - as opposed to the eMMC failing. Former could potentially be remedied:
- Updater selhal: Failed to provide the approval report: Read-only file system [3.7.1] - #15 by Weafyr - SW help - Turris forum, or
- purge/reformat the partition and redeploy a medkit image (hopefully some backup is at hand)
It may also just be some temporary btrfs hiccup that goes away with a reboot but chances are probably slim and odds are high that booting will fail.
To get this sorted remotely via VPN may not be feasible