Hangs while booting after Android 17 update (71.2.A.2.35)

[Tabray]

My Phone won't boot anymore. I made the update to Android 17 last week. It seemed to be working until I restarted the phone today. It hangs on the boot screen with the XPERIA text.

I tried shutdown with power button and volume up pressed until the phone vibrates 3 times and restart. Did not help.
Same as obove only pressed for over 2 mins. Did not help.

Is there a possibility to fix it without loosing all data on the internal memory? Can Service technicians write the Android software without erasing all data on the phone?

Sony, WHAT are you doing, this is soo ***** up. If I have to reset the phone I have to install all software again, loosing data. This sucks. Especially on Android since there is no real backup solution at hand. 

[Tabray]

BE AWARE
Don't install the update 71.2.A.2.35.

If you disable the Gboard keyboard and use another, the phone won't boot anymore after a restart!!!!!!!

After that, there is no way to get your data back on the internal Memory. 

This will be my last Sony phone