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You might be able to restore the NOR with 'Apple Configurator 2', which seems to be a public version of an internal tool, though it's limited to taking an other
by spacedcowboy 5y ago
You might be able to restore the NOR with 'Apple Configurator 2', which seems to be a public version of an internal tool, though it's limited to taking an otherwise unbootable machine to a fully-installed-OS machine.
Plug the bricked machine into another Mac using a TB3 cable in a particular slot (they tell you which) and follow the instructions. Worked for me.