RBK50+S. How to allow only n and block a/b/g/ac

Smart connect and WiFi Mesh systems are all automatic now days. Handling of WiFi modes on Orbi is all automatic and handled between the Orbi and the connnecting devices. Selecting of different modes isn't supported on Orbi. Other NG routers you can do this if you disable Smart connect and set the Max Speed Rate supported by the router. However NG hasn't supported any kind of specifc modes to be selectect by the user. Just which speed rates maybe used is all. Orbi it's all automatic.