PSA: if you try to partition an M1 mac with Disk Utility, it works, but it breaks recovery mode. Presumably the bootloader hardcodes that recovery is partition #3... instead of using GPT partition type codes as it should. Deleting the partition fixes it...
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Yeah, I've only realized this too late. The bootloaders are totally different on the M1 (iBoot derivative) vs. x86 (Apple EFI)
As far as I can tell the startup options menu on M1 macs is just... macos recovery already. A fullscreen app pretending to look like the old UEFI boot picker.
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What exactly happens if you mess up and brick the device? Reflash via apple configurator like the dev kits?
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Yup. DFU mode, just like an iOS device.
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