I have similar problem.
I have my .kml file with saved Route, but unfortunately I can not find it in my navigation iGO primo.
I have tried creating following folders on Resident Flash: CONTENT/USERDATA/ROUTES/ and copied in my .kml route, but after restarting my device can't find it in saved routes. I have tried to copy my .kml file in POI and again, can not find it anywhere between POI objects.
Created the same on SD card: PRIMO/CONTENT/USERDATA/ROUTES/ and copied in my .kml route. Changed Navi Path to SDMMC. Again, my route is not appearing anywhere.
After I tried to copy all PRIMO folder on my SD card and without any success.
The size of my .kml route file is 307KB.
I have red internet across to find any solution for this problem, but without any success. Unfortunately I am not a big IT specialist and have no idea, what I am doing wrong. Maybe somebody have any idea, what could help?