Ive got a radio in another boat that is installed similar to a car radio. Theres a locking device that the radio snaps into when push into the box that holds the radio. The only way to remove the radio is with a special type key that slides in from the front of radio and disconnects this locking system, then the radio pulls out from the front. If you have an audio shop close I would have them look at it, they might have the tool to get it out. Hope this helps.Murph