hey guys so i sold my buddy my edge race evolution cs when i upgraded to a sparton and, as fare as i know and eveyone else at a shop can tell me is there is no way that i could of loaded a spartan tune over top of my edge tune. But the major problem we are having is it wont let us put the edge tune onto his truck? are these chips vin locked once they go onto one truck. or what do u figure the problem is. the code that comes up is vehicle checksum error file 8U7AAG? hope someone can help us out thanks.