Update via Updater app no longer seems to work

[Volker]

@Asperamanca

I saw it in the console during the update. A red line indicating that the system partition cannot be found.

That’s a normal output line (although it sounds strange) during OTA update.

@Asperamanca

If I backup using TWRP, and later restore it, should that work?

Yes, except that /data/media (i.e. the internal common storage) is not included in normal TWRP backup.