![]() ![]() If you want to downgrade to a version of macOS that you didn’t originally download from the App Store, or a version of macOS that was never available via the App Store (such as Mac OS X Snow Leopard) then there are some workarounds. ![]() In the best case scenario, you’ll want to downgrade to a version of macOS that you downloaded via the App Store, as this means you’ll be able to re-download the installer via the App Store. You’ll also need the version of macOS that you want to install. Just be aware that formatting this drive will wipe everything from it! If the USB drive contains anything that you want to keep, then make sure you move or copy it to a safe location before proceeding. If you don’t have a Time Machine backup, then downgrading is going to be more complicated, as you’ll need to create a bootable installer.įor the best results, you’ll need a USB flash drive with at least 12GB of memory.
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