If he was to get a new flash box to tune his car, the first time it was plugged into his car, the modified tune (if it has one) would then become his F tune, a tuner could flash a standard tune into the car, but it would not be his f tune. It could then have another flash box plugged in and then then that tune would become the F tune, in the 2nd box, but it would leave the first box worthless A ford dealer could reflash it back to stock but would probably charge for it. The car should be run to see what PSI it is running to see if it has been tuned or not