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Here is one procedure for possibly recovering an affected Mac which cannot boot: https://mrmacintosh.com/how-to-restore-bridgeos-on-a-t2-mac-how-to-put-a-mac-in
by bangonkeyboard 7y ago
Here is one procedure for possibly recovering an affected Mac which cannot boot: https://mrmacintosh.com/how-to-restore-bridgeos-on-a-t2-mac-how-to-put-a-mac-into-dfu-mode/ https://mrmacintosh.com/how-to-restore-bridgeos-on-a-t2-mac-...
It requires a separate, recent Mac, involves arcane combinations of specific ports, keys, and timings, relies on luck and voodoo, and ultimately may not even work.