You now have a bit-for-bit bootable copy. This method works flawlessly for DMGs that are complete disk images (including the boot sector). It will work for DMGs that contain only the .app installer file.
Double-click the .dmg file to mount it. If it contains a .pkg file, run it; this typically installs a "Install macOS [Version Name]" application into your Applications folder. create mac os x bootable usb installer from dmg
Click to begin flashing. This process bypasses Windows file restrictions and creates a native Mac-bootable sector layout. Method 3: Converting DMG to ISO on Linux You now have a bit-for-bit bootable copy
Open (Press Command + Space , type "Disk Utility", and press Enter ). Double-click the
Once your bootable USB installer is successfully created using any of the methods above, follow these steps to boot your target Mac: Turn off the Mac completely.