@mario-ch

I actually downloaded 4 versions of the OEM after I read the post, and numbered them. Then went through the whole spiel with fastboot, wipe, twrp, oem, ubports.

it worked with
TWRP 36090 kugo
OEM SW AOSP v08 loire
UBports 0.8.9.
and some patience.
Finalizing install now, thanks a lot!

on ubuntu pc, with xperia compact x:

starting with android 8, flashed twrp, removed all data.
then flashed oem binaries 'loire'. got an 'ok' on all of these - great.

When running ubports - starts up great, nice blue light, picks the right phone, but just when downloading packages the phone disconnects. Not a cable issue - did not touch it, different cables, different ports, all the same: reboot at about at file 8 or 10. If I reconnect (cold start, boot, blue light) ubports does not recognize the phone is back on connection.

Tried ubports 0.8.8 and 0.8.9, same result. Tried also the oem v17, tone, still nothing.

On the phone is a tool 'ubrecovery', but there are no img files I could use.

I do have a micro SD to move files, if necessary. Any idea on how to get this to work, please?