Keep holding the keys until you see an Apple logo or spinning globe.Shift-Option-Command-R: When you press and hold these four keys at startup, macOS Recovery might offer the macOS that came with your Mac, or the closest version still available.Option-Command-R: When you press and hold these three keys at startup, macOS Recovery might offer the latest macOS that is compatible with your Mac.Command-R: When you press and hold these two keys at startup, macOS Recovery will offer the current version of the most recently installed macOS.If none of them work, review the guidelines for using startup-key combinations. Immediately after releasing the power button, press and hold one of these key combinations.Press and release the power button to turn on your Mac.After that, click on the gear icon labelled "Options".If you're not using a Mac with Apple silicon, you're using an Intel-based Mac. On an Apple silicon Mac, you can also turn on your Mac and continue to hold the power button until you see the startup options screen.Use this key combination to erase your drive before giving it to someone else. If you've never installed 10.12.14 (Sierra), using ⌘ Cmd+ R will install the OS without tying it to your Apple ID.If you didn't have 10.12.14, Sierra, this key combination will not work. On an Intel-based Mac, to install the macOS your Mac came with, no matter how out-dated, press ⇧ Shift+ ⌥ Opt+ ⌘ Cmd+ R.For example, a Mac from early 2012 will not be compatible with macOS 10.15, Catalina. To upgrade your macOS to the most current OS that is compatible with your Mac, press ⌥ Opt+ ⌘ Cmd+ R.If you're hoping for a different version, check out these alternatives: This key combination tells your Mac to reinstall the same version of macOS that was already installed. Press and hold ⌘ Cmd+ R right after you press the power button.
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