Restart your Mac while holding the Option key.Plug in the external drive with macOS Mojave on it.Now everything should be ready for getting macOS Mojave back on your Mac. Once your Mac’s drive is erased, quit Disk Utility.In the Utilities window, select Disk Utility and click Continue.To go back to Mojave from Catalina, you have to uninstall your current version of macOS first.
Hit Return and provide your password when requested 3. Enter the command: sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/YourDriveNameġ2. In the Applications folder, select Utilities10. Go back to Finder and select Applicationsĩ. In the Erase tab, select the macOS Extended format and click EraseĨ. Open Disk Utility and select your external drive from the sidebarĦ. In the Applications folder, select Utilitiesĥ.
Connect a USB flash drive or an external drive with at least 16GB of storageĤ. To revert to Mojave from Catalina, you need to have a bootable installer.Ģ.