human
How to enable USB booting on Chromebook?
assistant
Enable USB Booting on Chromebook
1. Back up your Chromebook.
2. Power it off.
3. Boot into recovery mode.
4. Press Ctrl + D and press Enter.
5. Press Ctrl + D to log in.
6. Open the console.
7. Type "sudo crossystem dev_boot_usb=1" and press Enter.
8. Insert the drive and press Ctrl + U.