Model :

Hardware Version : Not Clear

Firmware Version :

ISP :

Lately, TP Link made a few firmware for Archer C9 V1. All of them had problem. Last one, Archer_C9(UN)_V1_160517, is no exception.

I upgraded, and it was good for an hour. I left the router for a few hour, when I came back home, I noticed that I do not have internet. All light on the router were green, but no device
had internet. I used another router to make sure that the problem is not from outside. All devices could connect to second router. So, the problem is firmware itself.
Web interface of router was not accessible wirelessly.
Fortunately, after factory default, I could downgrade to Archer_C9_V1_150507. This one is solid without problem.