To default the unit, I had to use the analog phone port and dial the following:
#991*15901590*
In the end, the following configuration worked:
1. Under Network -> IP Settings -> IP Addresses leave WLAn and Network to be on the same network. (A tick enable/disable option).
2. Ensure the DHCP settings do not clash with your network. For Wireless to work best you need some DHCP addresses to be enabled.
3. Under the Internet access settings, tell the router to use an existing LAN connection with no authorisation. It will tell you to connect the LAN cable from LAN0 on the router to the network switch.
4. Now it should work.