(Normally, you could hold Option at startup, and then select it but having Shift stuck down seems to prevent this.) Option 2: Select recovery mode with an NVRAM setting When that's finished, select that drive in System Preferences -> Startup Disk, and restart. In summary, download the macOS installer application from the Mac App Store, plug in a flash drive that can be erased (because it will be), and run something like: sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolumeĮnter your admin password when prompted (it won't echo), and follow the prompts. See Apple Support Document HT201372: "How to create a bootable installer for macOS" for full instructions. So I recommend at least starting the first option. The second option is probably simplest (if nothing goes wrong), but if it doesn't work, having an installer drive (first option) will give you a lot more options.
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