Application with overlay crashed device [3.4.0.22]

Unfortunately, I already updated and am not able to enter GUI again.
During the update process a message appeared like ‘Something went wrong, please try again later. REBOOT’.
After reboot, I have no GUI (only some kind of flickering white/black a few times).
ssh and devel-su into the phone are working.

Is there a list of potential overlay applications? Any suggestions?


pkcon refresh
-> Fatal error: Medium not attached: plugin:/ssu?repo=adaptation0

version --dup
-> Error: Medium not attached: plugin:/ssu?repo=adaptation0

ssu status
->
Device registration status: not registered
Device model: Xperia XA2 - Dual SIM (h4113 / h4113)
Device variant: sony-nile
Device UID: …
Release: 3.3.0.16
Domain: sales
Brand: Jolla

EDIT:
I solved it with ‘pkcon update; version --dup’
Now I am back at version 3.3.0.16 and give the upgrade another try.