Open and enter the following creation command (replace MyVolume with the exact name of your USB drive):
Use the macOS Terminal to create the bootable drive using the createinstallmedia command. Open (found in /Applications/Utilities). macos big sur 1121 installer dmg
To avoid malware and corrupted files, always obtain the installer directly from Apple's servers. Method A: Using the Mac App Store (Recommended) Open and enter the following creation command (replace
Once you have your installer ready, either as a downloaded app or on a bootable USB, you can proceed with the installation. macos big sur 1121 installer dmg
to convert a Big Sur installer app into a bootable DMG file?