Well it worked for me, connected the wires, powered on pc, waited a couple of seconds, powered on 360. When i got to the dos prompt, typed mtkflash r orig.bin, disconnected the wires, pressed enter, selected my channel and dumped the firmware. Turned off 360.Hexedited 4000-4200 into the xteme 3 firmware. connected the wires, powered on pc, waited a couple of seconds, powered on 360. When i got to the dos prompt, typed mtkflash w /m patch.bin, disconnected the wires, pressed enter, selected my channel and flashed the firmware.
Reconnected the wires and job done. I am useless at soldering but I still managed. easy job.