How to create bootable macos usb5/19/2023 Download macOS Big Sur if you haven’t done so already.Backup your Mac and proceed at your own risk. Use exact syntax at the command line, as failure to do so can result in erasing the wrong volume. How to Create a Bootable macOS Big Sur Install Drive If you’re not comfortable with the command line, you can also use a tool like MDS to download installers and create boot disks with. If you’re not familiar with the command line, be sure to backup the Mac first, and to follow the instructions exactly.
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