1) Cut a hole in the XBox
2) Stick your dick in the XBox
3) Warm apple pie
Yes, its free, and this is what the 200 page mod manual boils down to...
1) Open the 360
2) Find out what kind of drive you have (Hitachi, Samsung, BenQ/Philips), and what ROM version.
3) Download the appropriate firmware
4) Connect your 360 to your computer via SATA cable
5) Flash the drive with the appropriate method for your drive
6) ???
7) Profit from $2 games