If you’re selling, trading in or giving away your Mac, close the setup assistant without completing the setup process, then click Shut Down. When installation has completed, your Mac may start up to a setup assistant.Your Mac may restart and show a progress bar several times, and the screen may be empty for minutes at a time. Allow installation to complete without putting your Mac to sleep or closing its lid.If the installer can't see your disk, or it says that it can't install on your computer or volume, you may need to erase your disk first.If the installer offers the choice between installing on Macintosh HD or Macintosh HD – Data, choose Macintosh HD.If the installer asks to unlock your disk, enter the password that you use to log in to your Mac.Click Continue, then follow the onscreen instructions.When you see a window with the option to reinstall macOS, this means your Mac has started up from Recovery. Then click Next and enter that user’s administrator password, which is the password they use to log in to the Mac. If you’re asked to select a user you know the password for, select the appropriate user.To select a Wi-Fi network, use the Wi-Fi menu in the top right-hand corner of the screen. You may be asked to select a Wi-Fi network or attach a network cable.

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 during the startup process, macOS Recovery may 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 during the startup process, macOS Recovery may offer the latest macOS that is compatible with your Mac.

Command-R: when you press and hold these two keys during the startup process, 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.

If you're not using a Mac with Apple silicon, you're using an Intel-based Mac.

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