We had a Predator owner whose upload experienced a communication error and left the car stranded on the side of the road. This occured on a Sunday so the car had to be towed back to his home. On Monday, Diablosport did furnish an unlock code that allowed the owner to again try and successfully upload a tune.
This is just here to be informational. I would caution you to only download and upload tunes at your home or somewhere that the car could be left in case of a communication failure when using a Predator.