I put the map in SD card under Garmin folder and jcv file in JCV sub-folder. Both map and JCV ppears to work but I had to change the image file to gmapsupp.img. I did this using the MSM 2011 40 map though, not this CN 2011 map.
As for the map header, I just downloaded GMapTool. Had a hard time trying to get to the download link. Had to navigate through a number of advertisement pages. Need to figure out how to use the software and report back.
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