![]() ![]() Once that’s finished, launch Terminal from your Utilities folder.Find your external drive in the list, then select Erase, choosing the Mac OS Extended format.Now, open Disk Utility from Applications > Utilities.Next, you’ll need to download a copy of macOS Catalina from the App Store. ![]() ![]() Start by connecting an external drive with more than 12GB of storage to your Mac.Here’s how to create a bootable USB drive for your Mac: ![]() Create a bootable drive for Catalinaīefore you can downgrade to Catalina, you’ll need to create a suitable USB drive for the operating system. You can still revert to Catalina it’s just going to take a bit longer. Using Time Machine makes downgrading Big Sur much easier, but if that’s not an option for you, don’t worry. Downgrade to Catalina using a bootable USB drive Provided everything goes to plan, when your Mac restarts, it should be back to Catalina again.
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