Following instructions are provided without any warranty, and may even get you in trouble legally. The instructions are provided for testing, learning, preventing e-waste, and should be use with care. We (including contributers + commentators) are not responsible for any damage to your device(s) or any legal issues.
Instructions have been moved to https://github.com/francoism90/asus-router. :)

@Warborn123
Try to work with the
wlcommand. See my comments above how to use it to set country, disable DSF, set tx power, etc., see here or this one.To help others having the same router model as you, please post the output of the corresponding
wlcommands here. For instance,wl country listorwl -i eth8 channels(on my GT-AXE11000eth8corresponds to the 6G).When you set a country or channel, then always check with the
wlcommand, if the settings are OK:wl -i eth8 status. Do not check it on your wifi clients!Your wifi clients, e.g., mobile phone, laptop, have also regulatory settings which affect connectivity, for instance no 6G wifi. Your apple phone will most likeley set its regulatory wifi country to what it reads from telco network. On a rooted android device, you can override this via
sudo iw reg set COUNTRY. But since apple is super closed source... nothing to do here...Intel... well.... they use LAR algorithm to detect the country settings. This is a super shitty thing. Because LAR fails more often than succeeding. And if you are unlucky, it cannot determine a country based on beacon signals from neighbour's wifi and uses "world region", which has no 6G wifi channels.
Also note: Win10 and Intel cards = No 6 GHz wifi, you need win11.
Thus, replace your AX210 with Mediatek MT7922. (! only possible if your laptop does not have proprietary intel CNVio(2) interfaces!)
The MT7922 works perfect and stable with all my lenovo laptops, also under Ubuntu. No stupid LAR.
And as a bonus: You can even use 6GHz wifi with win10.