Ramiro, I'm having the same problem with the EW-7811Un. I suspect what is going on is that after I remove the network cable and reboot with just the WiFi, the IP on the HM shows up as 192.168.201.1 which is outside of my WiFi network settings on my router. All other IPs fall in the 192.168.000.xxx range so something is not right even though the WiFi dongle seems to be connected. I'm going to try to set it up through the rPi with a keyboard and monitor and see if that fixes it.