Press and hold the Power Button continuously. Release it only when you see "Loading startup options..." on the screen. Select the macOS installer volume and click Continue .
Replace /Applications/Install\ macOS\ Monterey.app/ with the path to your .dmg file mounted on your system, and /Volumes/macOS\ Installer with the name of your USB drive. create mac os x bootable usb installer from dmg
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A standard macOS installer DMG typically contains one of two things: Press and hold the Power Button continuously
: Creating an installer can take 10–30 minutes. Method 1: Creating the Installer on a Mac (Recommended) create mac os x bootable usb installer from dmg
until the screen reads "Loading startup options". Select the USB installer drive volume and click Continue .
Tell you are compatible with the createinstallmedia command.