BaseCamp doesn't "see" nuvi 2455 memory

Former Member
Former Member
Last week before going on trip downloaded and updated latest BaseCamp, Updated nuvi and got latest maps.
Went on the trip and now I want to download tracks from nuvi to Basecamp but the device is reported as having a "communication" problem and that I need to update software on device.

Did the quick update but there is still a communication problem.

Sometimes when I plug the nuvi in to USB to PC the external memory shows and other times it does not.

If the External memory shows I have two different maps on the nuvi 2015.20 on internal memory and 2015.40 on external memory.
I don't know if the map problem is the nuvi cannot consistently read the external memory or if having two different map versions creates a conflict

Should I have two different maps on the nuvi?