The General forum is where users can discuss any topic regarding Motorola communications equipment - hardware, software, etc. There are also several focused forums on this board, so please take the time to ensure that your questions doesn't fall into one of those categories before posting here!
I think spectragod just answered it perfectly..."Order a new radio from your dealer, really simple, and unfortunatly the only way to upgrade that radio that I am aware of. "
I've myself have never seen or heard of a modification to do what you want either.