5G WIFI isn't working with my RT-AC68U. To anybody?

Hello,

I've an RT-AC68U.

Using tomato shibby 2.4ghz wifi works correctly, however 5hgz doesn't.

I tried to change channel, network mode, password mode, etc. Nothing works.

With ddwrt firmware I connect with a mac and lg g2.

Anything special to do?


I'm using Tomato Firmware 1.28.0000 -138 K26ARM USB AIO-64K.

Thanks.