2009 b8 checking in. This thread was a great resource preparing for my first round of mods. I had my battery disconnected for a bit when I sent out the ECU. My experience was a bit different from a lot of members and maybe that has to do with my early model year... I guess if you don't replace the battery then you don't have to code with VAG-com? also I didn't need to enter a radio code. I have MMI with nav, if that means anything.