Hi aekhong and catymag,
I got it !!
Stranger thing, but I had to put the gmap3d.img inside the .System folder.
Before the convert, like 3790T, the GPS had read the gmap3d.img inside the "map" folder....
But it is ok. Matters that is working everything now!
Thanks a lot for the support!
I'm an adm on a Brazilian garmin forum, named nimraG (garmin in opposite way...lololo).
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