Find the detailed instruction here. C7 should be configured as an access point....

Devices which are 802.11n capable may not support 5GHz band. http://en.wikipedia.org/wiki/IEEE_802.11#802.11n 802.11n operates on both the 2.4 GHz and the lesser-used 5 GHz bands. Support for 5 GHz...

If the beta firmware doesn't fix it, why not re-open the ticket and tell them?

Wired connection to WPA2220 works OK? How about status of all lights on both units when you connect to internet or lose connection?

Cannot. If some one reset it, the router will go back to factory defaults and previous configuration will be lost.

Hi Carneth, did you make it? I'm not sure if the router can do what you want. Sounds quite complicated...Did you contact TP-LINK support team? http://ticket.tp-link.com/index.php?/Tickets/Submit