I just finished a new article that could be considered a follow up to my previous BridgeOS update & restore article. I talk about how BridgeOS updates work and how you can now downgrade from a beta version of BridgeOS (Big Sur) to a native production version (Catalina). This was previously impossible. In the past you had to wait until a more stable beta BridgeOS or wait until the next os went live.
https://mrmacintosh.com/how-to-downgrade-t2-bridgeos-beta-to-a-production-version/
My previous article on how to restore or update BridgeOS.
https://mrmacintosh.com/how-to-restore-bridgeos-on-a-t2-mac-how-to-put-a-mac-into-dfu-mode/
If you are having issues after you downgraded from Big Sur to Catalina on your T2 Mac, this might help you.
