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