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by kitsunesoba 2040 days ago
I don't own an M1 device, but it's been confirmed that boot security can be disabled entirely. I'm pretty sure that booting from external devices works fine once security has been disabled.

It's a bit different from Intel based Macs though. It used to be you'd hold Option while booting to be presented with an EFI boot disk picker, but now you hold down the power button to be greeted by a micro-macOS boot options menu.