Tomato Shibby / ASUS AC66U / 5 GHZ problem

Hello,

I updated my AC66U from v110 to v112 and 5 GHz settings are not visibles (display is like in v110).

I backed up my configuration then did a factory reset => ok 5 GHz is visible.

I restored my configuration => 5 GHz is not visible.

Does anyone have an idea please ?

Thank you for your help.