You'll need to erase your hard drive before re-installing Catalina. If you don't feel comfortable making changes to your Mac with Terminal, you can create a bootable disk using the DiskMaker X program. Note: Making a bootable installer requires the use of Terminal. How to make a bootable macOS Catalina installer drive in case you want to downgrade from macOS Big Sur.You'll need a copy of macOS Catalina on an external hard drive for the easiest, fastest way to install the downgrade.įollow the steps linked below to make a bootable installer drive for macOS Catalina Step 2: Create a bootable drive of macOS Catalinaīefore you downgrade your Mac and erase Big Sur from your computer, download macOS Catalina (opens in new tab) from the Mac App Store.
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