I was about to buy this https://www.ebay.com/itm/USB-Cable-K...UAAOSwoCtc-kby
from ebay but wanted to make sure since it says its compatible with the a4 cabriolet but not the regular b6 a4. Would also like to know if anyone has ever had one of these cheapos damage their ecu or anything like that. I can't imagine much could go wrong with a simple serial cable but would like to make sure.