Garmin Edge Touring Cycling GPS Navigator

hello

few weeks back i bought the garmin edge touring. i work in china, so the idea was to install the beijing maps. if you go to this site

http://garmin.openstreetmap.nl/

you can select any country, they send you a file and you are meant to install it on you garmin edge.

the garmin touring is a little different from the garmin edge 800/100. in the sense that when you access the sd card there is already a garmin folder, inside this garmin folder there are a few files. one of them is about 3.5 gb, the file extension is .img i assume this must be the US map p reinstalled? however i have not taken it out.
the file i put in was a map of beijing, I have enabled the map when switching on the garmin. but it does not show anything. and when i look at a route that has already been done, there is no map showing or any terrain at all, it just a line which i assume is the route.

any suggestions will be much appreciated