Create a bootable installer for macOS

URL :: https://support.apple.com/101578

Creating a bootable USB

• Download a full macOS installer from the App Store.
• Connect a 32GB or larger USB drive.
• Run the following command from a terminal (replacing /Volumes/Untitled with the path to your USB drive):

sudo /Applications/Install\ macOS\ Sonoma.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --nointeraction

Booting from the USB

If you’re on Apple silicon, do the following:

1. Turn off the device.
2. Connect the USB drive.
3. Press and hold the power button until you see the startup options screen.

If you’re on Intel silicon, do this instead::

1. Turn off or restart the device.
2. Connect the USB drive.
3. Press and hold ⌥ Option or Alt until you see the startup manager.