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.

[Members_Y2BthE5]

I have the same phone it was network redirects costing a lots problems .Battery hack with apps