OpenWrt would still offers it, but your network will not start. This bit me once when I was playing with that option. I don't remember if the logs said anything about it, though.
Currently I have a Dlink 2640, that is working perfectly with below configuration. I tried to replicate the same in the WAX206 but it does not work, even selecting 80 MHz as width
There are 4-5 wifi on the 36 and 1-2 on the 100. But the point is... why I can't use different channel using countries that allow it by doing the same thing that with a different router I can do, leveraging the SAME version of OpenWRT (23.05.02)?
Update August 24, 2023:
re: OpenWrt 23.05.0-rc3
D-Link DIR-882 rev.A1
Both the 2.4 GHz and 5 GHz wireless appears to be working fine now.
Although 2.4GHz performance appears to have taken a bit of a hit but similar in performance to using a dedicated access point.
No abnormal delays in device handshake to router with 5 GHz WiFi.
Website connection performance was similar to that of a EnGenius EAP1250 access point = Good.
EDIT: Added router info.
EDIT: RC3 firmware used was not downloaded using Firmware Selector.
Using Firmware Selector with some packages resulted in being locked out of the router!
I suggest you find what does work and be happy instead of getting mad it won't do what you want.
If you had read the entire post someone chimed in this chipset has been trouble from the start.
Just because they actually got 5g working does not mean all the bugs are gone. e.g. your router's issues.
I used the firmware selector, I downloaded the latest firwmare for the WAX206 and I installed as per the guideline here https://openwrt.org/toh/netgear/wax206.
I then set up the admi pass, the timezone and moved straight away to the wifi, trying to replicate the same configuration I had in the previous router.
Try using Panama, but then go back to the settings for your country as it is illegal if you do not live there. DFS check is done automaticaly. If there is an radar nearby the wireless will not start. If there is none it will stqrt after a while. You can check this in the logs.