Thank you for the reply sir. The next page of the Menu are these:
USB Video
BT Audio
AUX2
Did you mean sir that the folder name on my SD Card should be 'Mobilenavigator' instead of 'Primo2'? And set 'Primo2.exe' to 'Mobilenavigator.exe'?
Still, the Navi function does not respond further.
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