Originally Posted by
turbotrana
The first tune has a checksum error. If this is the stock tune send it to HP Tuners and they may be able to fix it up. It is very important to have a stock tune, even if just to do a compare to the modded tune.
The second tune is the modded tune.
So you can revert the SCT box to stock (unmarry) and you can download the second tune and start playing. Always keep a copy of both the modded and stock tune somewhere safe so if worse comes to worse you always have a tune to fall back on.