I find it odd ASUS removed all the other firmware versions...
404 NOT FOUND when I try to download previous versions from the page.
https://rog.asus.com/networking/rog-rapture-gt-ax6000-model/helpdesk_bios/
Can you test something?
When you enable 160 mhz can your devices connect to the router? For me it doesn't work at all. I wonder if it has to do with the new firmware or the router. I just got this router 15 min ago. With my AX86U my devices connect fine with 160 mhz enabled.
I recently bought the AX6000. I have it setup exactly the same as my AX86U. I basically copied all the settings over to the new router. Now all my devices won't see the 5ghz SSID. When I turn off channel bandwidth 160 mhz my devices can connect fine. It's only when I have 160 enabled my devices...