I don't have a JCV folder on the SD card, only on nuvi\.System\JCV.

About the 3D buldings, I put the file on SD\Garmin (where the EU 2010.30 map resides). I don't have a map folder on the SD card.

Also, how can I check if the 3D buldings and the junction view is working?
Only on the road? If so, is this available to all cities and roads?

Thanks