![]() ![]() ![]() Quit Disk Utility and restart your Mac.You will need to provide a name, choose a partition map and format. Then, in the sidebar select Macintosh HD and click to Erase.Here in the sidebar select Macintosh HD – Data volume and click to Delete APFS Volume from the context menu. You will be switched to the Disk Utility window.You will see the macOS Utilities window.Then press and hold the Command (⌘) + R shortcut and at the same time press the power button. Click on Select Backup Disk… → choose the disk and click on Use Disk.Ģ.Download macOS Catalina or another system you want to use instead of Big Surīasically you have several options for installing another Mac operating system:.Go to System Preferences → Time Machine.For this, you need to follow these steps: I know the way of clean install of a previous version.
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