yeah, again, the device knows the map is there, but it's trying to authenticate the map (there is no authentication for it, it's from OSM). i called garmin and they're basically like "we dont support 3rd party maps". wtf is that?
The maps are not made by Garmin or an official MapSource Product Creator license holder, so they don't provide any support for them.
not sure if y'all are understanding the real issue: in order to cut out piracy, garmin cut off all custom/3rd party maps to their devices with the gpsmap 64st.