![]() ![]() Reinstall macOS Catalina or Mojave from Bootable Drive Agree to the terms and follow the instructions to download and install.In the pop-op macOS Utilities interface, choose Reinstall macOS>Continue.Hold down Command+R when rebooting your mac.Reinstall macOS Catalina or Mojave from Internet When the download finishes, follow the on-screen instructions to install macOS Catalina or Mojave.Search macOS Catalina or Mojave, click Download.There are 3 methods to install older macOS version on your mac. Choose APFS or macOS Extended format and confirm to Erase.Then select your Startup Disk, click on Erase tab.In the pop-up interface, choose Disk Utility>Continue.Hold down Command+R when rebooting to reboot your mac in Recovery Mode.Click on the Time Machine icon in menu bar, choose Back up Now.Run Time Machine and set it up for backup.Connect an external hard drive for backup to your mac.But here Time Machine backup is recommended. There are 2 ways to back up file, either back up your files to an external hard drive with Time Machine or upload your data to cloud-based service for storing, like iCloud, DropBox, OneDrive. If you don’t want to render your data under any potential risks, you are highly recommended to back up files. It is safe to upgrade or downgrade a macOS version, there is no harm done to your files or data, but data loss after mac update or reversion happens sometimes. Also, make sure your mac is connected to the internet for later macOS installer download. You should quit running programs and leave enough space (15GB to 20GB) to install Catalina after erasing Big Sur from your Mac hard drive. Before the downgrade, your data matters the most, so don’t forget to back them up though it takes time to finish a backup. To downgrade Big Sur to Catalina without losing data, here are 6 steps to follow. How to Downgrade Big Sur to Catalina without Losing Data? ![]() No matter what your reason is to revert to an older version, you can refer to following part to downgrade from Big Sur to Catalina without losing data.
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