By securing do you mean if it's password protected? Yes,it is. By disabling the 2,4 Gz on the router, extender still can't connec't to 5G. I tried an older ADSL dual band router by Tp Link (which by...

I did a little more research and I realized that I am facing the exact same issues here as the users of this topic :...

Model : RE580D Hardware Version : Firmware Version : 171220 ISP : My RE580D range extender no longer connects to the 5gz band of my router...My router is the archer VR900V. I can't pinpoint the date...