It's not a router itself, it's a 'box' given by my ISP that includes a router feature, I don't know for the firmware, but I do have another box, which is a newer version, that I'm not using for some reasons, I'll eventually try it.
If you do /socklisten -p test 113, does the port forward work properly? It may just be that your router blocks UPnP forward requests on certain ports but not others.
