NOS 500 MHz Router: Settings lost after Power Outage

Hi,

The default security is WPA + WPA2.  This setting causes the iPhone to list as “Weak Security”
This router can only be accessed using the NOS Net APP.  

The setting can be changed via the App to WPA2.  However if there is a power outage the Router reverts back to WPA + WPA2.

Any ideas on how this can be solved?

Thanks