But Apple doesn’t let you downgrade your current version of macOS. If you’re installing to an external drive or a new partition, you can just follow what the installer tells you to do. Select your USB drive and wait until it loads.Keep holding it until you see a choice of boot options.Before the chime, press and hold the Option key.How to use a bootable USB drive on a Mac: To that, you need to select it when your Mac starts up. When you’ve created a bootable USB drive, you can use it to install macOS from. Click Create Installer and wait for Disk Creator to finish Installing an old version of macOS from a USB drive Browse your Mac to find the macOS installer in Applicationsĥ. Select your USB drive under Select the volume to become the installerģ. How to create a bootable disk using Disk Creator for Mac:Ģ. This does the same thing as using Terminal commands but with a simple graphical interface. You can also use the free app Disk Creator to make your bootable USB drive. Use Terminal to put the installation files on the USB driveĬheck out our full guide to making a bootable copy of macOS to see how this is done.
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