So I have come to the conclusion that this has to be the one method that is almost guaranteed to rid of absolutely everything regardless of the state of your M1 Mac, including all data and system volumes, all user accounts and passwords, Apple ID association, and start fresh:ġ) do the usual "hold power button" to boot into macOS RecoveryĢ) when the 4 icon options appear, ignore them and go to top menu bar and find "Terminal", launch itĤ) a GUI password reset dialogue window will appear, again ignore this, go to top menu bar to find "Erase Mac" and goĥ) if the Mac is still associated with an Apple ID namely Find My Mac, it may prompt you to type credentials, otherwise it will literally nuke the whole volume right awayĦ) probably takes minutes, after it is done you can go back out to do a fresh Big Sur install in the normal 4 icon window without restarting (there is no need to go Disk Utility, the drive is literally empty and macOS installer will create necessary volumes from scratch) Over the Big Sur updates pretty much every time it bricked on me so I have had at least 3 occasions of having to erase & restore, and I went into similar barriers and also tried different solutions, involving using 2nd Mac with Apple Configurator doing DFU reset.
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