I have an Audi TT Quarttro 2002. I had to change the battery and now my stereo stop working showing SAFE on the screen. I need to know how to reset it because I don't have the manual book for the stereo. I bought my car used and the owner lost the book. I called a dealer and they told me I have to pay $60 to reset it. Can someone post an instruction on how to reset it. I'll find out the code from the Audi. Any help is appreciated.