Nevertheless sparse Apple’s documentation may need change into, when it does clarify issues correctly, it’s wonderful what’s revealed within the element. One doc each severe Mac person ought to learn and check with repeatedly is the Platform Safety Information, which Apple has simply revised to provide all of the gory particulars of how M1 Macs begin up. In the middle of doing that, it reveals that these new fashions have a boot mode which doesn’t look like documented wherever else, however which might show a Mac-saver: Fallback Restoration OS.
In the event you want your M1 Mac to enter 1 True Restoration (1TR), Restoration Mode, however that fails, there’s a second copy of the software program required for 1TR “for resiliency”. In addition into that, as a substitute of simply holding the Energy button till 1TR begins loading, it is best to “double-press and maintain the ability button”, in response to the information.
In apply, I’ve discovered this requires you to press the Energy button twice in fast succession, and on the second press, as a substitute of releasing the button, maintain it pressed till restoration choices are reported as loading. This works reliably on an M1 MacBook Professional, however I’ve up to now been unable to get it to work in any respect on my M1 Mac mini, however perhaps I’m simply not doing it proper.
What you then get is each bit nearly as good as common 1TR, with one important exception: you’ll be able to’t set the system safety state utilizing the Startup Safety Utility. Apple explains that it is because “LLB [Low-Level Bootloader] doesn’t lock a sign into the Boot Progress Register saying it’s going into recoveryOS”. However for all different functions, that is simply nearly as good as 1TR, and is similar.
I’ve up to date my web page on M1 boot modes to incorporate this useful addition, which makes me much more impressed with 1TR, though perhaps this fallback could be higher named 2TR.