Power on your Xbox console and television.
Navigate to and select “System Settings” from the Xbox Home screen.
you may need to select “Settings,” followed by “System.”
Select “Console Settings.”
Navigate to and select “System Info.”
Write down the serial number of your Xbox console.
Alternately, you can obtain the serial number from the back of the console itself or from the inside of the oval door located on the front of your console.
Press the “B” button on your Xbox controller two times to return to the System Settings menu.
Navigate to and select “Storage” or “Memory.”
Navigate to “Hard Drive” and press the “Y” button on your Xbox controller. The Device Options menu will display on-screen.
Navigate to and select “Format.”
Select “Yes” when prompted to confirm that you want to delete all content from your Xbox.
Enter the serial number for your Xbox 360 when prompted to by your console.
Select “Done.” Your Xbox 360 will now begin to reset, and restore itself back to its original factory settings.