thatroger580 wrote

After updating to firmware Archer AX20(US)_V1.2_211231, 5Ghz or Wifi 6 is very unstable, Most of the time its not even in the list of scanned networks but everything is good in previous firmware.

Hello @thatroger580, thank you for reaching out to us and welcome to the TP-Link community.

When the 5GHz network is not showing in the list of available networks, can you please confirm which channel is it running? You can install a Wi-Fi analyzer software on the laptop or on the phone, scan for the networks, then confirm what is the 5GHz channel when it is working fine and what is that when it is not, we may need to confirm if it switches to a channel that your mobile phones don't support. You can also try to modify the 5GHz wireless channel on the router to something that you are sure it is working in your network.

thatroger580 wrote

@Kevin_Z i have checked with every channel on both firmwares.After updating to latest mentioned firmware this problem occurs but on the previous firmware every channel on 5ghz works fine.

Hello @thatroger580, thanks for getting back.

If you can confirm the previous version works fine before the upgrade, please try downgrading to that version and monitor again, do let us know if that is still stable, thank you.