Android 12 upgrade on S20: pre-alpha quality, any help? Downgrade to 11?

[Sergey Udaltsov]

I updated 2 days ago my S20 SM-G981B to Android 12, official, non-beta. The phone started misbehaving badly:

1. Various apps crashing/freezing (including official Samsung Galaxy Store, Youtube Music etc).
2. A couple of times I got into endless reboot loop, could fix only in recovery mode + cache clean. 
3. At least twice after reboot I was getting the odd error message:

 

Anything I could do to troubleshoot or get back to normally working Android 11?

Of course, I have the latest firmware and latest versions of all apps (only from Google App Store and Galaxy Store).

The worst firmware I ever had.

[Samzung_Customer]

A factory reset should be done, that may sort your issues out.

I think slowly, but surely other users are reporting issues now for the S20 series with this update

I'm having slight lag/choppiness performance behaviour.

Especially when like opening or closing apps and UI stutters.

[Sergey Udaltsov]

I would not like to reconfigure dozens of apps.

[Samzung_Customer]

Maybe try to do a backup

[LOOK18]

if you downgrade you have to reconfigure all the apps again..if you restore it is the same ... so the choice is yours

[Sergey Udaltsov]

really I want something less radical than reset or downgrade.. 

[LOOK18]

try this .. if the problem persists you have to bring it to assistance

[Sergey Udaltsov]

what is 'this'?

[LOOK18]

reset or downgrade

[kkdowning]

I got almost the same problems on S20+, my battery went from 60 to 4% in less than 2 hours, everything is running slow, I hate the "extending" animation when you scroll to the end (I preferred the white line that shows up), mobile data is ultra slow...

Not sure what to tell you other than check your IMEI and search for a ROM that fits your IMEI and flash the phone through ODIN, I suggest this if your warranty is done.