These systems are garbage.  There is no ability to create a dedicated 2.4ghz channel aside from activating the guest network which then tells you there is a "security risk" because you guest network is activated and no one is using it despite the fact that you have five devices hooked up to it.  However, this isn't the biggest issue. 

The biggest issue is that you cannot dedicate any port as being "open" so that devices may connect to it. INSANE.  For instance, wifi enabled garage doors WILL NOT work.  They need a dedicated open TPC port.  You are also unable to manually control channel congestion.  ASUS and NEtgear allow you to do this.  I am literally throwing this entire system, all three deco units out and starting over.  TP LINK is terrible.