Hey all! So I have an 07 N* with the Bose 5.1 Nav Unit. Since I've owned the car I've actually never used the navigation as I didn't have a disk. Recently I was able to obtain a free copy of the 2013 maps, and thought awesome can finally use it. Put the disk in the nav unit and nothing it wouldn't read it. After some research on this very useful website I see there is a software update for my unit. So I print out the TSB floating around here and set up an appointment at Ed Morse Cadillac in Del Ray Beach, FL. So yesterday I drop the car off at 8:30 am now the service adviser was very friendly and didn't know of this update but once I gave him the paper work he looked it up and assured me they had the update disk floating around and could get it done. 8 hours later he calls to tell me my unit wouldn't take the update and he thinks it needs to be REPLACED!!! I find this way to hard to believe everything else works great Radio, Xm, OnStar, Bluetooth. I asked if he had an old disk we could try to see if it would at least read that and no he didn't. So now they want me to leave my car with them for god only knows how many days to really dig into it (his words not mine). But before I do that and see the $ rack up I wanted the opinion of the community, maybe someone has an old Nav disk they could allow me to use to test my system or just point me in the right direction. Sorry for the lengthy post but I'm going crazy trying to get this damn Nav working. Thanks again guys for any input.