I have a Zyxel Prestige 660HW which matches the ZyXEL Telefonica Prestige 660HW 61 on the compatible routers list but just can't get it connected. I've tried it initially with my current settings but have dropped it down to un-encrypted, no mac filtering, dhcp visible SSID but it still won't connect. It did see the network though. Always get Error Code: 51300. Any ideas?