If you have any other Mapsets in Your Nuvi Delete them. (Don't just deselect them, Delete them)
I've had the same problem when I have a lot of Mapsets in the Nuvi. (Real 3490LMT)
Perform Hard Reset
From Master Volume Screen in Landscape Mode
Press Right Top Corner for 10 Seconds
Then Clear all user Data.
You can also try holding the power switch down for more than 10 seconds for quick fix.
It will reboot the nuvi to reload map data from SD Card.



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