AC660u: 5ghz stuck channel bandwidth on 20Mhz

[SirGhost]

All -

Apologies if this is somewhere on other forums. I've read many, and I haven't seen any discussion of it exactly. This is not the same as "channel 6 stuck on 2.4Ghz" issue. I can set the 2.4Ghz to settings to the 20Mhz bandwidth and change the channel.

Issue: In the Wireless->General->5Ghz screen, I cannot configure the router to use anything other than 20 Mhz for the Channel bandwidth. I have set the Wireless Mode to "N+AC", and I am trying to configure the router to use 40 Mhz as the effective bandwidth. I can change the menu item and click "Apply" - but the result is always that the router reverts back to 20 Mhz. Nothing I do will cause the router to accept the setting change.

I've tried using latest ASUSwrt firmware (3.0.0.4.374.979). In looking to fix this issue, I installed the latest Merlin build (3.0.0.4.374.38_1). Both are showing the same problem.

I tried changing the SSID's for the networks - such that I no longer have any 2.4Ghz networks sharing a name with 5Ghz networks.

I changed control channels, power settings, turned off Guest network, etc.

Nothing seems to let me convince the AC660u router that I want to use higher bandwidth 5ghz channels. Annoying.

I appreciate any pointers that can be offered.

 

[ikoul]

Did you do a factory reset after flashing the latest firmware? Some new default settings that come with a new firmware aren't applied until you do, plus it clears out old hidden settings that might be causing your issues. Wasn't sure if that was included in the "etc" part of what you tried.