I managed to crash my windows with an esoteric „inaccessible boot device 0x67“ error after deleting a driver that Windows 11 didn’t want to load because of high kernel isolation settings.
The system could not fix that, neither by going back to a restore point no other means like automatic system repair, safe mode, etc., until I executed the Windows 11 setup from a bootable memory stick and then made system restore return to a previous system restore point.
For some reason, this did the trick.