So as it's a bit tricky for users ,a small explanation again:
If you have CN NT map in your Nuvi use SMALL map, it wont appear in map list but it will work just adding cities EPM to your existing CN.
If you have NTU map in your Nuvi use FULL map, it will appear in map list coz you'll have another complete CN cities map in your Nuvi. (SMALL map with just MMR made for NT map wont work with NTU map)
To test EU CX ,fix the satellites in the city or simulate in one of the cities putting your position in the city.
EUcx .img name and .unl name must be the same ,different extensions- To make the .unl with JM Kg use just FID 800
Both files go in sd in "Map" (not "map" - not Garmin) folder