hdiutil convert /tmp/BigSur.dmg -format UDZO -o ~/Desktop/macOS_Big_Sur_11.2.1.dmg Use code with caution. 7. Clean Up Temporary Files
sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/BigSurInstaller --nointeraction Use code with caution. macos big sur 1121 installer dmg
Press Return , enter your admin password, and type Y to confirm erase. hdiutil convert /tmp/BigSur