@Kevin_Z No, I have done multiple resets also 1 week ago. Together with waiting for a few minutes before pluging the router back to the power. After I week I said that I will try again and it just...

@Routy I have tried with reset after 1 week and now 5GHz wifi stayed turned off.

I want to permanently disable 5Ghz Wifi network. When I disable it in GUI, 5Ghz is not active, but when router restarts 5Ghz wifi is again active. How can I disable it permanently, so that even after...