How to check there’s no hardware problem, then use Restore in DFU mode to completely wipe internal storage, including firmware, and reset the NVRAM.
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Recovery reinstall, using an Installer app, or a bootable installer, or with an Apple silicon Mac in DFU mode? What the choices are, and how best to do it.
Is that Mac completely dead due to a severe failure, or could it just be in DFU mode? They aren’t easy to distinguish on most Macs.
What should you do if a firmware update goes wrong? Here’s a guide to avoid panic, whether your Mac is Intel, has a T2, or M-series chip, and for Studio Displays.
Apple silicon Macs are better-equipped to prevent and deal with disaster. Restoring in DFU mode is extremely unusual, and more powerful than anything you can do with an Intel Mac.
Why your Mac’s firmware version may not be the latest you expect. What you can do about that, depending on its type.
The rules of firmware updating explained, and their consequences for each type of Mac. How to refresh firmware on a T2, and how to downgrade it in an Apple silicon Mac.
Should you be scared of ‘bricking’ your Mac? Just what does it mean, and what could you do about it? Don’t panic: it’s not a dragon to be slayed.
Erase your M1’s internal storage in Recovery, reinstall macOS and you could see an error in which it failed ‘to personalize the software update’. That’s not easy to fix, as explained here.
What would happen to a Mac’s firmware if you installed Monterey beta to its internal or external disk? Could that be reversed?
The Eclectic Light Company 