[PROBLEM] upgrade to Krypton returns 16.1 after reboot

[jakenl]

I run through the Xbian GUI menu the normal update procedure (stable). Reading the update text scrolling by I don't see anything misbehaving. Installation is successfully. After reboot, I am back at version 16.1 again. I first thought that maybe some plugins are in the way, so I deleted a bunch of them that I don't use anyway by 'uninstalling' them the official way. After a reboot all those plugins were back...

Maybe it somehow loaded an old snapshot, and through the Wiki I was able to delete all existing snapshots. After another reboot, all those snapshots are back....

Alltogether it seems like my SD-card is in read-only mode but how in the world can that happen? Kodi still runs fine, so that is not a problem, but I can't update a single thing anymore.