![]() ![]() Select Restore From Time Machine Backup → click on Continue → confirm it. For this press and hold the Command (⌘) + R while restarting. Connect the external drive with a backup to your Mac.If you use Time Machine, follow these steps to reinstall macOS Catalina: As we mentioned above, you can restore the earlier macOS from the backup or reinstall it using a bootable installer. Now you are ready to downgrade from macOS Big Sur to Catalina. Quit Disk Utility and restart your Mac.You will need to provide a name, choose a partition map and format. Then, in the sidebar select Macintosh HD and click to Erase. ![]() Here in the sidebar select Macintosh HD – Data volume and click to Delete APFS Volume from the context menu. You will be switched to the Disk Utility window.You will see the macOS Utilities window.Then press and hold the Command (⌘) + R shortcut and at the same time press the power button. Also, that is the reason why we asked you to back up your data before downgrading the system.įollow these steps to erase Macintosh HD: That’s why you have to completely erase the new systems on your Mac and clean up all your files. But if you want to install an old system on an already installed new one, this process will not even start. The macOS system is designed in a way so that it allows you to install a newer macOS system on the earlier system. But let me first explain why you need to do this. Now you need to erase macOS Big Sur for a clean installation of another system version. Select one of the options above and move to the next step on the way to downgrading macOS Big Sur. Save the installation file on an external hard drive. Here are the links where you can download macOS Catalina, High Sierra, or Mojave. Download in advance the version of macOS to which you want to downgrade from Big Sur. Learn on the Apple support page on how to reinstall from macOS Recovery. By default, Apple provides the possibility to reinstall the factory-preloaded system from macOS recovery. If you regularly back up your Mac, most likely, you can restore one of the previous backups and revert to macOS Catalina from Big Sur. Download macOS Catalina or another system you want to use instead of Big Surīasically you have several options for installing another Mac operating system: Click on Select Backup Disk… → choose the disk and click on Use Disk.ģ.Go to System Preferences → Time Machine.Transfer your data to external cloud storage, such as Dropbox, Google Drive, iCloud, or use the Time Machine and select an external disk for storing the backup copy: ![]() Also, one of the next steps will include erasing your HD on macOS Big Sur and recovering your data on another system. In case something goes wrong, you can always recover your important data. Generally, we recommend that you always back up Mac’s data before updating and installing any new system on your computer.
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