Enter a name for the file to be destroyed (Like macOS Mojave or something).Click on Disk Utility in the OS X Utilities selector.Ĭlick on the Erase tab at the top of the window.Hold down Command-R when you hear the startup chime (or the screen turns black on newer Macs) and keep holding the keys until your computer reboots.Connect your Mac to the internet via Wi-Fi or Ethernet.How to create a bootable installer for macOS Big Sur.If you don't create a bootable drive for macOS Big Sur, you may have to install an older Mac operating system first and then upgrade to macOS Big Sur afterward. You'll need a copy of macOS Big Sur to perform a clean install later on. VPN Deals: Lifetime license for $16, monthly plans at $1 & more Step 2: Create a bootable drive of macOS Big Surīefore you erase your current operating system, download macOS Big Sur from the Mac App Store.
