![]() ![]() 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. (If you've already formatted the external drive, skip to Part 2.) ![]() 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. 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 Ventura Using a Bootable Installer It is recommended that you back up your Mac before reverting to an old macOS.
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