Hello Everybody, I am a new member and this is my first post. I recently bought a v8.0 command navigation dvd from a friend for my 2005 clk w209. The car had one of the early versions on it when i bought it(v2.2). When I took the old one out and put the new one in, half way through the process Error2 message comes up and fails to update the version. I also went to 2 merc dealers near me, they both said it should work just by replacing it with the new one. I also heard from others that I might need a software update disc first. Where can I get this update disc? What's the part no? Merc dealers say that there's no such a disc. & you don't need it... I'm sorry if this has been discussed before but I can't find it. Thank you to everyone for taking their time to answer, I really appreciate it. I didn't get much help from the dealers today. Thank you very much.