sudo asr imagescan --source /Volumes/Install\ macOS\ XXX/BaseSystem.dmg
Double-click your .dmg file to mount it.
| Symptom | Diagnosis | Fix | | :--- | :--- | :--- | | createinstallmedia not found | You pointed to the wrong path or the app is damaged. | Ensure the .app is in /Applications and you typed the name exactly (use Tab key for autocomplete in Terminal). | | "Not enough space" | Your USB is smaller than 12GB or corrupted. | Use a 16GB+ drive. Re-format using Disk Utility (View > Show All Devices > Erase with GUID). | | USB doesn't boot | The DMG was for a different architecture. | A DMG for a PowerPC G5 won't boot an Intel Mac. A Catalina DMG won't boot a 2008 MacBook. Check compatibility. |
The createinstallmedia command (Apple’s official tool) requires the .app bundle, not a raw DMG. If your DMG contains a .pkg installer, you must run the package first to extract the .app to your Applications folder.
Rating: 4.5/5 Stars
sudo asr imagescan --source /Volumes/Install\ macOS\ XXX/BaseSystem.dmg
Double-click your .dmg file to mount it. create mac os x bootable usb installer from dmg
| Symptom | Diagnosis | Fix | | :--- | :--- | :--- | | createinstallmedia not found | You pointed to the wrong path or the app is damaged. | Ensure the .app is in /Applications and you typed the name exactly (use Tab key for autocomplete in Terminal). | | "Not enough space" | Your USB is smaller than 12GB or corrupted. | Use a 16GB+ drive. Re-format using Disk Utility (View > Show All Devices > Erase with GUID). | | USB doesn't boot | The DMG was for a different architecture. | A DMG for a PowerPC G5 won't boot an Intel Mac. A Catalina DMG won't boot a 2008 MacBook. Check compatibility. | | | "Not enough space" | Your USB
The createinstallmedia command (Apple’s official tool) requires the .app bundle, not a raw DMG. If your DMG contains a .pkg installer, you must run the package first to extract the .app to your Applications folder. | | USB doesn't boot | The DMG
Rating: 4.5/5 Stars