![]() Once Terminal says it’s done, you can quit the app and remove the USB drive.You’ll be prompted that Terminal wants to access files on the removable volume, click OK to allow.Enter Y to confirm you want to erase the USB drive.Enter your admin password if prompted and hit Enter again.Once you’ve entered the command line, hit Enter.El Capitan – sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume –applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app.High Sierra – sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume.Mojave – sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume.Catalina – sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume. ![]() Big Sur – sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume.Also remember to change MyVolume to the name of the USB drive you’re using: Type in the command lines below (as shown on Apple’s support page) depending on which version of macOS you’re trying to install.Now that your USB drive has been formatted properly, you’ll now need to make sure it is bootable. Keep in mind that this essentially wipes your USB drive of all data, so make sure that the USB drive you plan to use doesn’t have anything important on it. Give it a minute or two and it should be done.Give the drive a name, select Mac OS Extended (Journaled) under Format.Click on the drive on the sidebar to the left and then click Erase.If you’ve decided to download an older version of macOS, these are the options that you’ll be able to find from the App Store:Īfter you’ve downloaded the version of macOS you want to downgrade to, you might be tempted to just click on the installer and let the installation begin, but unfortunately it’s not that simple as you will need to create a bootable USB drive.īefore you proceed, make sure that you have all your important files backed up to an external drive or to the cloud so that you don’t lose those files in case something goes wrong during the installation process.Īpple recommends that users have a USB drive that has at least 14GB of free space and that it has been formatted as Mac OS Extended. Restoring Time Machine backups could be tricky if you’re trying to restore a backup made on a newer version on an older version of macOS (for example restoring a backup made on macOS High Sierra on OS X El Capitan).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. ![]()
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