Sometimes when you use the VIN unlock function to reset the tuner for installation onto another vehicle, you may get an error message when trying to go through the programming procedure about the tuner not being able to find the file for your truck. This means that the tune database on your tuner is older than the software inside the PCM of your truck and it cannot match the two together.
Each firmware/software revision for your truck's PCM has a part number attached to it, and if the tuner cannot match that part number with its own database, it will present that error. This is can be fixed by using the updater application supplied by the manufacturer of your tuner.
This software can be found at: http://www.dieseltunerpros.com/.
Note: Due to the unpredictable origins of many H&S tuners on the market, there is a high chance updating the tuner with the software above will brick your unit. Proceed with extreme caution!