I downloaded Apple Big Sur program three weeks go, now my printer driver isn't recognized by the new system. I typed Command, Shift, Option R to restart the older version but it said my disc was locked & couldn't go any further. I would appreciate anyone's help to solve this disc is locked problem. Also, someone mentioned I could revert using Time Machine, but not sure if that would help getting out of the Big Sur platform.
To go downgrade to an old version of macOS, I would recommend contacting Mac Support.
Before you make a decision to uninstall Big Sur, check out some common macOS 11 problems and fixes. Maybe, the problem that is hampering your flow is on the list — and you can easily solve it. Also, if your Mac runs macOS Big Sur beta, you should know the public version available starting November 12 fixes most of the problems.