@Kevin_Z Further to my reply of March 4th, I am happy to let you know I have been able to resolve the connection problem. It turned out that my ASUS router RT-N66U has a "Wireless Log" which sits...

@Kevin_Z , Thank you very much for your detailed answer. However, this will not solve my problem. I will explain below. I use the extender precisely as it is designed for: to extend my WiFi coverage...

I am using as router ASUS RT-N66U and have successfully set up my AC750 RE200 extender (only for 2.4G). LED shows on extender OK. My ASUS router sees the extender connected and shows a MAC address...