Quote Originally Posted by suger4spice View Post
My problem is the reverse. I have a nuvi 3490 with Europe LTM. The European maps and JCV are being updated regularly by Garmin. I also purchased North America NT and installed it on an SD card. Map was purchased online and downloaded to the Card, but only the map file was provided, no 3d buildings or JCV. Please advice how I can add the supporting files to the sd card. Thanks.
Why did you download the map on a SD card and didn't connect your 3490. As soon as there wan no more available space on 3490, it would ask you to insert an empty microSD card to finish installation.

On your SDcard, inside GARMIN folder, copy GarminDevice.xml file from your Device:/Garmin/ folder.
Insert the SD card in a card-reader and try to update the map with GarminMapUpdater.
I hope that the program will "see" your card as your "3490" and download the map and all the additional files that are specific for your 3490.

My only thought is that, the map is maybe lock with your SDcard id number, and if the card is less than 4 Gb, maybe you get an error response.