The process takes 15–30 minutes. Once you see Copy complete and Done. , your bootable USB is ready.
Hold the Power button until "Loading startup options" appears. create mac os x bootable usb installer from dmg
| Issue | Solution | |--------|----------| | Command not found | Check the .app name and path carefully – use Tab key for autocomplete | | "MyVolume" not found | Rename USB to exactly MyVolume (case-sensitive) or adjust the command | | DMG contains only a .pkg | Install the .pkg first, which places the .app into Applications | | .app is hidden in the DMG | Some DMGs have InstallESD.dmg – mount it and use Disk Utility's Restore feature instead | | Old macOS (Lion/Mountain Lion) | Use Disk Utility: drag InstallESD.dmg → select USB → click | The process takes 15–30 minutes