How do you install maps in Navitel

Hi guys,

I successfully innstalled Menaco on my Dacia device, when I start my MediaNav device, eveything seems Ok.
When I start Navitel, it's starts without any problem. I downladed Benelux and France maos from Navitel's site. I've installed the .nm7 files in the right folder on the USB stick, but the Navitel app doesn't find them. When I use the app to explore the USB stick, and I browse to the folder, it does not show me any map.
So, so far, I cannot use it.
Any clue ?

I have exactly the same problem on my Renault Clio IV with maps for few other countries.