I have the same problem but got there in a odd way - I was offered an update to Catalina but when I installed that update it installed Big Sur, not Catalina. Now I am experiencing the Big Sur frozen screen.
podolsky
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
From
Maine