Read my response in your video card thread.
About unlocking, it is entirely card dependant. Some cards canot do it, others can. For each card that can, you need a specific flash file for that card. Also, it is nota guaranteed process...sometimes it works, other times it kills your card, and even other times it only works on half of the pipes you were *supposed* to unlock. For each card, it is a risky process...and definetly not guaranteed. What card are you looking to flash?