Straight up who ever you got your tuning from has no clue what he is talking about and you should get your money back from him. He is a retard, he has absolutely zero clue and has no business being in the tuning business. BBX is the configuration setup for your autocal to work on your truck, it has nothing to do with your tune file, it’s the configuration of your autocal. Get your money back from the guy and report him as an illegitimate person to get tuning from. Your autocal has to be configured to work on your truck before it can write the tune file to your truck.