![]() Start up the Mac holding down the Option/Alt + R while it is booting up.Plugin the external drive that contains your bootable installer. ![]() Your Mac will display the Startup Manager, click on your external drive and select Install macOS.Īfter creating a Bootable Installer of Mac OS, follow these steps to downgrade Mac OS:.Start the Mac holding the Option + Alt key while it is booting up.Plug the external drive into your Mac that you want to install the macOS on. ![]()
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