#Downgrade mac os to high sierra how to#
#Downgrade mac os to high sierra install#

Click Restore to retrieve the backup (including macOS Catalina and your personal data).

Choose the destination (typically your Mac's internal hard drive) to save your Time Machine backup.

Select the backup disk and click Continue.

Select Restore From Time Machine Backup in macOS Utilities window and click Continue.

Connect your backup drive containing macOS Catalina to your Mac.

Then, you can follow these steps to revert to macOS Catalina: That's because the backup contains the macOS Catalina installer files.Īfter the Macintosh HD being erased in macOS Recovery, choose Disk Utility > Quit Disk Utility to return to the macOS Utilities window. If you've backed up your Mac with Time Machine before upgrading to macOS Big Sur, the macOS downgrade work will become very easy. Downgrade from Big Sur to Catalina with Time Machine backup It's up to your situation and preference.

#Downgrade mac os to high sierra install#

The erasing process will take a while, don't do any other operation during the process, or the startup disk may be damaged.Īfter backing up your files and passwords and erasing your startup disk, you can get down to downgrade your macOS to or install Catalina by one of the following methods. Set a name, choose APFS in the Format: box.Choose the macOS volume and click Erase.Then, right-click the macOS-Data volume and click Delete APFS Volume.

#Downgrade mac os to high sierra how to#

How to Fix Mac Recovery Mode Not Working.Restart your Mac and press and hold the Command + Option + Shift + R keys until the Apple logo appears (or the spinning globe) to boot into macOS Recovery mode.The startup volume erasure task should be taken in macOS Recovery mode. Erase your MacĪfter the backup work is finished, it's time to erase the startup disk to make room for macOS Catalina. Or write down all the accounts and corresponding passwords. To save your passwords, you can check in Keychain in iCloud when using it to back up data. Notably, macOS reversion will also erase all the passwords you used in the current OS, like passwords for apps and networks.

Or, you can back up your Mac files with Time Machine for restoring after rollback macOS update. If you want to back up all data on your Mac, you synchronize it to your iCloud if there's enough storage space. If you only need a few files, copy them to an external hard drive as a backup. Thus, you need to back up your Mac in advance. The macOS downgrading process will erase all data on your Mac. Back up your Mac: important files and passwords The three ways of downgrading macOS to Catalina are also suitable for downgrading from Big Sur to Mojave or High Sierra, from Monterey to Big Sur.