I tried doing a GPS udpate, and it didn't work. MapNSoft (the maps company) claims that it's my port, and my local dealer won't help me (they won't even admit that there is a GPS update). When switching two of the USB's MapNSoft sent me, and the whole system crashed. I can play music, using my tuning buttons etc. but there's no visual. The reset button isn't working, and I can't figure out any other way to reset it, short of bringing it to the dealer (who basically has the worst service). How would a dealer fix this problem?