I may have a way to load the poi.
1) get a usb cable male-male
2) connect this cable to the PC and to the USB socket (the one used to play music)
3) reboot the Garmin device by a long press on the vocal command button
4) the needed driver shoul install on the PC
5) start POILoader (a Garmin tool to do that)
6) select your POI folder
7) done!