We've had the m9 mesh system for awhile now and recently upgraded our NBN to Fibre to the premises (FTTP) , thus no longer needing a modem router to act as a bridge as required when we were to the node (FTTN). But due to the NBN box location, we now have a corner of the house that is the furthest from the mesh and is patchy at best. 

Is there a way to set up our old TP Link Archer VR400 model router to act as another mesh wirelessly that can extend the current network? Unfortunately running a lenght of ethernet is not practical...

Thanks