Thank you, but I was doing stable xiaomi.eu 12.0.1 -> stable xioami.eu 12.5.
I tried both recoveries you mentioned and the effect is the same, after installing, wiping cache/dalvik, restarting to system, it constantly goes to recovery. I have 70 GB of personal files (I guess it's on /data partition), I backed up most important ones, but I would rather not format it, if I'm not sure it will help. Do you have any other ideas? Maybe I will install different ROM than xiaomi.eu 12.5? Can I install 12.3? Or maybe global stable 12.5?
TWRP in backup menu says "Data (excl. storage) (24151MB)" and I see my user files are on /sdcard partition. I guess if I backup only /data and format it, then my user files are safe and only applications and their data will be cleared?
oh wait, my user files are also under /data/media/0