Things You'll Need
Instructions
Update with Xbox LIVE
Connect your Xbox 360 to your router or modem with the Ethernet cable. This will allow the console to access the Internet.
Sign in to Xbox LIVE on your Xbox 360 dashboard. If you do not have a LIVE profile (also known as "Gamertags"), you will be prompted to create one.
Load an original Xbox game into the disc tray of your Xbox 360. The system update will begin automatically.
Restart your system after the update completes. Your 360 will now play all supported original Xbox titles.
Update with a USB Flash Drive
Connect the USB flash drive to your computer by plugging it into an open USB port.
Download the console update file from Microsoft (for link, see Resources below). Unzip the archive file after saving it to your computer.
Copy the update files to your USB flash drive, then disconnect it from your computer.
Plug the flash drive into an open USB port on your Xbox 360 (they can be found just below the power button). Restart the system. When the system asks you if you wish to install new software select "Yes, update now." Your original Xbox games will be playable when the update completes.
Update Using a CD or DVD
Download and unzip the system update from Microsoft (for link, see Resources).
Insert your blank DVD or CD into the disk drive on your computer.
Copy the Xbox 360 update files from your computer to the disc using your CD/DVD burner's software package. When the disc is complete, remove it from your computer.
Place the CD/DVD in the disc tray on the Xbox 360 and restart the system. When prompted to install software updates, choose "Yes, update now." Once the disc installs, you'll be able to play your original Xbox games.