i have read those...but very confusing.....what methods should i use????
i dont even know where to put the files

I have mapsource install on my PC and able to launch
I download and run 2012.10.exe for 3790 and it prompt for unlock code
I go to the directory where 2012.10e.exe extracted the file and copy the JVC folders and imgs to the device \garmin folder. The GPS still loads with old map....the problem is in the first place i cannot even find the old maps in the device