Hi,
Could you check if CLI is reachable? If you somehow blocked yourself through RMS, which is very unlikely, you should be able to reach the device through CLI. If you're able to reach CLI - let me know.
If it will not work - try unregistering and registering the device back.
If that also will not work - just reset the router to default factory settings as there might be something else done that will be hard to find.
EB.