I used MapUpdater to download Europe NTU 2015.10 & what i found is that i had an update for the DEM file also.
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The size of the files is exactly the same, 310,392 kb
In my case with nuvi 3490 this new Europe DEM file came in the .System folder as D2249750A.img. In order for the device to see it as a DEM map in "my Maps" menu and for me to be able to check or uncheck it must be renamed to gmapdem.img.
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