Are you able to update your firmware to the latest version? any 7.0 and above? Not every RUT900 can be updated to the 7.0+ version because of the hardware, so it would be nice to know if you can. What is the product code of your device?
Can you please provide more details? What is your network topology? What problems are you having? Maybe you can attach a troubleshoot file?
Have you checked our Wiki? You can find some information about OSPF HERE and HERE.
Also, when you enable a routing protocol, you should be able to use command 'vtysh' to enter a cisco-like command line interface. This will allow you to execute commands such as 'show ip route' and some other cisco commands on your RUT device.