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Save software licenses and important files.Follow the steps below to back up your Mac, erase the startup disk, and then reinstall macOS. New Macs that ship with 10.15 Catalina pre-installed cannot downgrade to 10.14 and below, though future upgrades can be undone by downgrading back to 10.15 Catalina. Any compatible Mac that can upgrade to macOS 10.15 Catalina can also be restored to another compatible version. If you’ve recently upgraded your Mac’s operating system to 10.15 Catalina and need to go back, this is the guide for you. In this guide, we will show you how to downgrade your Mac’s operating system from macOS 10.15 Catalina to another compatible version. MacBook Pro introduced in 2018 or later.
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MacB o ok Air introduced in 2018 or later.Contact Apple Support for assistance with your Mac computer. Macs with Apple’s T2 chips cannot be downgraded with this guide.
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