Attempting to do the restore from the installer USB fails. Time Machine backups must be restored by first performing a fresh Big Sur installation and then doing the Time Machine restore from the Setup Assistant. In my testing, this appears to correct the instability. So far, the only fix seems to be similar to the method for disabling FileVault: Back up the entire Big Sur installation using Time Machine, erase and reinstall Big Sur, and use the Setup Assistant to restore the Time Machine backup.
The instability is not fixed by running the Big Sur installer again. Upgrading from a Catalina installation which has been patched using dosdude's macOS Catalina Patcher results in an unstable system. (Not to mention, FileVault bugs may also make it impossible to open Terminal on the installer USB.) The best way out of this conundrum is probably to back up the entire Big Sur installation using Time Machine (Time Machine encryption, unlike FileVault, appears to be stable), erase and reinstall Big Sur, and use the Setup Assistant to restore the Time Machine backup. Description: This issue was addressed with improved state management. Apple is aware of a report that this issue may have been actively exploited against versions of iOS released before iOS 15.7.1.
BIG SUR MICROPATCHER UPGRADE
Once you upgrade to Big Sur, bugs may make it impossible to disable FileVault and may make it impossible to unlock your FileVault volumes when applying updates or booting from the installer USB. Impact: An app may be able to modify sensitive kernel state. Compatibility List: Spoiler: Macs officially compatible with macOS Big.
For maximum stability, disable FileVault before upgrading to Big Sur. 1 This thread will be used to discuss advancements in getting macOS 11.0 Big Sur running on unsupported Macs. _FileVault has been buggy throughout the entire Big Sur development cycle. Reading this I am uncertain to solve the issue: do I have to go back to an original Catalina-Installation, then deactivating FileVault and upgrading or can I deactivate FileVault on a fresh patched BigSur installation?
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