Boot original Xbox bios
- Power on the xbox with the “EJECT” button.
- The green xbox logo will show. ( ie original bios)
- It will remain using the Original Bios until you power off the xbox.

Boot modchips's bios
- Power on the xbox by holding the "Power" button for 1-2 seconds
- The evox xbox logo will show. (Ie modchip bios)