Do you explore folder .System on device? You must make change in PC setting for permission to do it by the way. You can see gmapprom.img and satellites in this case.
D6210030A (South 2018.10) .unl and .gma are remains from previous installed version only.
P.S.Garmin Express have the own opinion about the most beloved wife which he calls gmapprom! But at the most case a North map is gmapprom.
Bookmarks