let me just get one thing straight-this model CANbe unlocked because i did mine-if you fish around online you'll find a service manual-even the service manual makes no mention of this board which from memory is held in place by two screws and it just slots onto connectors in two places, i think as i remember it's got a bit of a L shape, sorry i don't know the technical terms you're all using or what it's called but it obviously did something in my case