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Most operating systems these days have started incorporating the recovery mode that helps repair computers in dire times. For Mac users, Command + R is the
M1 Macs have another hidden boot mode
However sparse Apple’s documentation might have become, when it does explain things properly, it’s amazing what’s revealed in the detail. One document every serious Mac user should read and refer to repeatedly is the Platform Security Guide, which Apple has just revised to give all the gory details of how M1 Macs start up. In the course of doing that, it reveals that these new models have a boot mode which doesn’t appear to be documented anywhere else, but which could prove a Mac-saver: Fallback Recovery OS.
If you need your M1 Mac to enter 1 True Recovery (1TR), Recovery Mode, but that fails, there’s a second copy of the software required for 1TR “for resiliency”. To boot into that, instead of just holding the Power button until 1TR starts loading, you should “double-press and hold the power button”, according to the guide.