Sonoff Zigbee dongle

My dongle is not automaticly discovered by HA. I was looking around and found out it was not discovered by my synology ( on dsm 6.2). Updated the drivers and now I have a ttyUSB0, but not a `/dev/serial/by-path. I think that is my problem.
I cannot add zHA because there is no connection with the dongle
Can anybody help me out ?