Originally Posted by
Fraree
I have a similar question. A mate gave me his 1705 Max micro tuner as he sold his truck a while back.
I've read in the paperwork accompanying the tuner stating the unit can be "Vin locked". I have plugged this unit in, as per instructions and nothing ! So the question is, what now? 
Define "nothing". Nothing shows up on the screen, no instructions as to either load, unload, or a msg that shows that it's vin locked?
If he didn't return his truck to stock, there is very much a chance that it is vin locked to his old truck. You have a couple of options. 1. Pay the company to unlock the device. 2. Use it as a code reader only or 3. Toss it and buy a new one.