If your Mac doesn’t include Apple’s T2 security chip, you won’t need to enable external media booting. To verify that you have this chip, follow this path: Apple button > About This Mac > System Report > Controller (or iBridge). These devices include Apple’s T2 security chip providing secure boot, encrypted storage, live “Hey Siri” commands, and more. It also applies to the iMac Pro released in 2017 and newer. This step applies to MacBook Pro, MacBook Air, and Mac mini models released in 2018 and newer. If you need help backing up your Mac, follow these step-by-step instructions. As stated, downgrading to Mojave requires wiping your Mac’s drive. If not, create one now before moving on to the next step. Chances are you may already have a backup before installing Catalina. Further reading:īefore anything, create a current Time Machine backup to save your files, or send everything to the cloud, whether it’s Dropbox, OneDrive, iCloud, or so on. Just make sure to choose the right operating system (OS) version for what you want. Note: These steps work just as well for switching from MacOS Big Sur back to Catalina.
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