So i have DIR-890L running latest FW (1.21) Tried to change it from 1.20 but problem continued.
Also tried factory reset, no change.
So my problem is that it won't let me change secondary 5GHz channel from auto to anywhere else. (In my area the channel it is currently is pretty polluted 108)
The Primary 5ghz changes fine, but the secondary only shows blank bellow auto. When i try to change to that blank, it wont change the channel or give me options to change it anywhere else but to auto after saving.
I will attach pictures:
https://imgur.com/a/VDZzSgI
https://imgur.com/a/JJnhCOM
Any tips? Tried this on Windows 10 that is connected to the router with cable. Also tried this with mac and different browsers, no change.
Thanks!