alright man theres a few ways you can go about this
one way is to get the unlock password off your xbox and hook it up to your computer and unclock it manualy
second way is to disable locking in the xbox bios
third way is to turn the xbox on and wait till the harddrive spins down and unplug the harddrive real quick witht he xbox on
if that doesnt work chack out www.xbox-scene.com
for some tuts
may i ask why you need to unlock it?