Sony tablet z4 Wifi problem 5 GHz

[NanoBublik1]

Sony tablet z4 and ASUS Wireless Router RT-N66U.

Latest Firmware.

Sony does not see 5 GHz WiFi. Other my devices see.

What is the problem?

[Uliwooly]

@NanoBublik

is there another router that you could test?

[meenaman]

Try a full network restart, turn off all your Wi-Fi connected devices, then finally turn off the router. Give everything a minute or so to shut down completely, then turn the router back on. It'll take a couple of minutes for the router to complete its startup and re-connect to the broadband. Once it's back online and the lights have stopped blinking start turning your device back on, hopefully with no more issues. Otherwise check Sony Xperia Z4 Tablet Manual for wireless connection troubleshooting. 

[NanoBublik1 · Accepted solution]

There was a solution to the problem.
On the menu Router

Wireless - Control Channel - Band 5GHz 

Clear the checkmark - Auto select channel including DFS channels

Now the speed on my tablet is 200 Mbps Super