I have been told that I can not use a used ecm from a nother car because of the transponder code(in the key) and also that mazda ecm,s can not be reflashed to change the vin # . dose any one NO if this is true or is there a way it can be done ?the ecm# on on it is AJB7-18-881F it is for a mazda 6 2005 3.0 6speed auto. any help would be great thanks