Device light not on for AC 750 even though Ethernet is plugged in

[Aiyubb7]

My wifi extender is plugged in and connected to the wifi. But when I try using it on my Xbox One, the device light does not seem to be on, even though an Ethernet cable is plugged in. I thought the Ethernet cable was the problem, but I bought a new one today and still the device light is not on. The problem only started occurring from yesterday when the device light just randomly turned off and wouldn’t turn on. It has been working for the past couple of years with no issue. Any advice on how to fix this? I tried searching which model I have, but I don’t see it on the options. I will attach a picture of the device.

[plemans]

The label wll have the model number. 

did you try other devices other than the xbox? 

Did you try factory resetting and reinstalling. 

If you reinstall, I'd highly recommend reinstalling using the installation assistant and not wps method. 

[Aiyubb7]

How do I do the reinstallation? I’ve looked online how to, but I’m still a bit confused on how to.

[plemans]

https://www.youtube.com/watch?v=yJVklshxBMk

[Aiyubb7]

I’ve tried factory resetting multiple times but it won’t work. I’ve pressed the factory reset button for 5 seconds and then let go. But after it restarts it automatically connects to my router

[Aiyubb7]

I’ve reset it using factory reset and set it up using installation wizard, but now the router light is blinking

[plemans]

Is it working? are there issues with it? 

How far from the router are you? 

Have you tried changing the wifi channel?