I have a Nuvi 1490T with maps up until the last update of 2011. Can you please tell me exactly which files I need to transfer over to my unit to make everything current? I have seen Post #1 and there are several files there but I don't know exactly which ones I need. I know I need the GMAPPROM.IMG 1.60GB file and the gmap3d.img 177,7MB 3DMaps file and the D3060050A.JCV 757,1MB LaneAssistFull = Junction View file, but what about all those other files? I could really use your help. Thank you.