Notice: This method applies to downgrade macOS: Big Sur to Catalina, Catalina to Mojave, Mojave to High Sierra, High Sierra to Sierra and downgrade Mac OS X: Yosemite to El Capitan, etc.
How to downgrade mac os without time machine mac os x#
Downgrade macOS or Mac OS X with Time Machine
Here, you'll find two methods for you to downgrade macOS without losing data and you can choose either one as a guide. After backing up all data, then you can start to revert macOS with ease.
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.