I recently bought a 2016 F-150 with Sync 3 with Navigation. I'm trying to update Sync3 - however, and here's the rub - the truck didn't come with navigation originally. It was added by the previous owner. When I go to owner.ford's website for the update files, the files I download are obviously VIN specific, so it gives me the files to update Sync 3 without navigation. When I plug my USB drive into the port in my truck, an error pops up and says the files are for non-nav vehicles, which my truck used to be. I need to be pointed in the right direction on how to get the files that update Sync 3 with navigation. I spoke with 3 dealers in my area, and only one is willing to even attempt to update my system. The other 2 wanted nothing to do with this. I spoke with Ford's IVT team several times, and they said it shouldn't be a problem for a dealer to update the system, but now I'm nervous that a dealer CAN'T do it and I'm going to be billed for tech time regardless. Any help at all is very much appreciated. I'm just spinning in circles on this.