It's highly recommended for you to back up all important Mac data first before you start downgrading Mac OS to an older system. Tip: Backup Mac data before downgrading macOS or Mac OS X Methods on this page can be applied to all Mac systems including the latest Big Sur, Catalina, Mojave, High Sierra, Sierra, and old Mac OS El Capitan, etc. Full stepsĪfter reverting macOS or Mac OS X, run EaseUS Mac file recovery software > Scan and recover lost data. Full stepsīack up data first > Plug in USB and launch Disk Utility > Erase USB > Rename it as "My Volume". Start Mac and hold Command + R keys > Enter Recovery Mode > Insert Time Machine drive.
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