Hi Guys. I have got a Ford Mondeo 1997. I bought bluetooth mini obd2 elm327 version 2.1 in ebay.com and this item came to me but didnt work 2.1 in my car. I want to down this firmware to version 1.5. Elm327 version 1.5 is working in my car. How can i down my mini elm327's firmware from 2.1 to 1.5???...