Haxorware Sb5101 Can Only Use One Computer

[wdw2050]

I am having the same issue. my modem was working with my router then one day its stop so i plug the modem direct to the computer and i got internet and then i try the router again and get the RR provision page. I also brought a new router samething. I try the mac clone setting on the router same thing the RR provision screen.
also on the RR provision screen it say MAC ADDRESS UNKNOWN?

any suggestions