X-BOX 360 - Xtreme Firmware:
The software is installed / programmed directly to the X-box 360's DVD driver PC board. Using an X-Box on X-Box Live with this modification may get the console banned from X-BOX Live. PLEASE NOTE: Only backed-up games from the same region as the console or region free games will work.

X-BOX 360 - i-Xtreme Firmware:
This is the same as the Xtreme firmware with the exception that it's still safe to use X-Box live with original games. Note with this modification only full stealth games will work.