You just need to read post one to understand maps names in your devices-
Your internal memory maps names are correct-
If the IMG you downloaded is locked use this before copying in your gps, no unl file will be needed-
[Only registered and activated users can see links. ] , then rename it in an appropriate way-
As you have already CNEU and CNNA in your internal memory, should be better to put your new IMG in an sd-
Create a Garmin directory and put it inside and rename it gmapsup2.img, or ,in some new devices, create a folder named Map and rename your map xxx.img, where xxx is the name you prefere-