![]() ![]() Connect the MacOS Big Sur USB installer drive to a USB port on the Mac.Be certain you have made a full backup fo the Mac.Do not proceed if you do not want to remove all data from the Mac. Warning: This erases the entire Mac, setting it up as if it were new again. How to Clean Install MacOS Big Sur (Reformat, Erase, & Factory Reset) An understanding that a clean install erases all data and everything else on the Mac – nothing will remain on the computerĪssuming you’ve met those prerequisites, and you understand what you’re about to do and why you’re doing it, here’s how you can clean install macOS Big Sur on compatible Intel Mac or Apple Silicon Mac.Active internet connection (required by macOS Big Sur for setup). ![]()
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