What happens if you disconnect your battery?? Will it reset the ecu and cause you to lose your tune?

Wouldn't you only need the flash pro just to tune your care and nothing else? like a 1 time deal and sell it after?

 

No, it's a flash which burns to non-volatile memory

When you unlock the Flashpro from your car, you must return the tune back to stock. It's part of the process...

 

You don't need to keep the Flashpro physically connected to the car, but the FlashPro will remain logically locked to your car. While it's locked to your car, it can't be used to tune any other car. The only way to unlock it from your car is to return your car to stock.