Or maybe there are changes made to the UI that some users just aren’t a fan of, or maybe there could be some major bugs or app incompatibility issues with the new build. When the new owner starts up the Mac, they can use their own information to complete setup.The oldest version of macOS you can downgrade to will be the version your Mac came with, so for example if you bought an iMac that came with OS X Lion, in theory that would be the earliest version you can reinstall.If you happen to own an M1 or any M-series chipset, old versions of macOS will be incompatible as they were written for Intel’s x86 platform in mind.Thankfully though, if you want to go back to the previous version of macOS, or an even older version of macOS, it is possible, and here’s how to do that. ![]() If you're selling, trading in, or giving away your Mac, press Command-Q to quit the setup assistant without completing setup, then click Shut Down. Your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.Īfter installation is complete, your Mac might restart to a setup assistant. Allow installation to complete without putting your Mac to sleep or closing its lid.If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.If the installer asks to unlock your disk, enter the password that you use to log in to your Mac. ![]()
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