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Reinstall macos catalina how to#
Reinstall macos catalina mac os#

Now that you have prepared the external drive and macOS installer. macOS Sierra 10.12： System Requirementsīelow are the download links for the different macOS versions.macOS High Sierra 10.13： System Requirements.macOS Mojave 10.14： System Requirements.macOS Catalina 10.15： System Requirements.In most cases, macOS installers are kept in the Application folder.īefore downloading the macOS installer you want, check if your Mac is compatible with it. If the Scheme is available, select GUID Partition Map. To check which format your Mac is using, open the Terminal app and type and run the command: diskutil info /.

Reinstall macos catalina mac os#

If your Mac uses HFS+, choose Mac OS Extended (Journaled).

Name your drive as MyVolume or whatever you like and choose a format your Mac supports from the Format drop-down menu. Select your drive in the sidebar and click the Erase button at the top of the window. There might be other files in your drive. Although the macOS installer is about 12GB, you'll still need some extra space to store your data. You need an external drive of at least 14GB. To help you understand better, we've divided the steps into 4 main parts. This method is more complicated than the two methods mentioned above.

Reinstall macos catalina how to#

We'll show you how to install a downgraded macOS using a bootable installer. What if you don't have a Time Machine backup but still want to revert to an earlier macOS? Do not worry. How to Downgrade macOS Using a Bootable Installer

After the reinstallation process is complete, restore the files you backed up.

Select your Time Machine backup and click on Continue.

In the macOS Utilities window, select Restore from a Time Machine backup and click the Continue button.

Keep holding these two keys until you see the Apple logo or other loading image.（On Apple Silicon Macs, press the Power button.) Start your Mac and immediately hold down Command-R to start up from the built-in macOS Recovery system.How to Downgrade macOS Using Time Machine BackupĪlso, you can downgrade macOS using a Time Machine backup, but only if you have a full backup of your Mac on your earlier macOS. Don't forget to back up your Mac before performing the reinstallation steps.