I have a 3865 that I need to sell. I tuned my truck back to stock before selling it, but now when I plug the tuner into my computer, it still shows the VIN on the screen. Is this normal, or is the tuner still linked to that ECU? If it is still linked, does that make it a $200 paperweight?

 

No it shows the last VIN it was attached to. If you set it completely (EVERYTHING) back to stock, then it is good to go.