As well said by
kolokythas above your Nuvì (it's HWID should be 1772) should be patched to read Unlocked Maps. otherwise you will get the message "can't unlock maps" on device.
Another issue: in the image above i can't view the only file you need,
the gmapsupp.img (this is the only file recognized by device).
The
Garmin_BinhHy_3.01.1016.gmap folder contents MapSource version Maps, they are to be installed on PC and than you can create the gmapsupp.img using MapInstall.
This is my Link to the same Map, but it contains the IMG too.
VietnamMap_3.01.1016_Unl.rar (160.5 MB)Archive contents:
MapSource Version (.gmap folder) UnLockedInstructions: Extract
Garmin_BinhHy_3.01.1016.gmap folder in the predefined Path (it should be
C:\ProgramData\GARMIN\Maps for Windows Vista and up)
J
CV Files (SVG + Raster)
IMG (gmapsupp.img) UnLocked
POI Collection (Ad_POI folder)- Hidden Content
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Last Note: your device need SVG JCV, not Raster JCV