Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes.
Here's how to set a firmware password: Go into recovery mode, look in the Utilities Menu.If your Mac is using a firmware password, you're prompted to enter the password. macOS Recovery installs different versions of macOS, depending on the key combination you use while starting up. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet. Command (⌘)-R: Start up from the built-in macOS Recovery system.Keep holding until the described behavior occurs. To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. If your Mac is having trouble, give them a try! From zapping the P-RAM to booting in safe mode, these are the secret key combinations handed down from Mac guru to guru.
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