I would like to report back that now my nuvi 3450 also see CXNA 2013.10 and map 2013.20 in the Map Info. How I got to it works? I had to create 2013.20 map from mapsource. I cannot use pre-made unlock img that was download from [Only registered and activated users can see links. ]. I place CXNA 2013.10 in X:\Garmin\Map --> CXNA.img & CXNA.unl
Now it's work..