I believe all you need to do is buy tune from vender or just download original sct tune into this sct. I have only download after market tune to the car for couple weeks and decide to load stock tune back to the car. As far as I know, sct holds 3 tune from custom tuning and it also has original sct tune (which I don't think that would be as good as custom tuning. I have only load custom tune into car then return to stock once. So this sct should still have 4 or 5 unlock. This is he'll of the deal. Device is in original box from American muscle Bama tuning.