@Kevin_Z 

Yes, no issues faced after downgrading the  firmware to (1.0.3 Build 20190226 rel.62939(4555) )

The new firmware has issue.

I am from India and the router hardware version is Archer A9 v6.0 (EU)

@Kevin_Z Any update on when you are planning to fix this? It is disappointing to see that my new router is not stable on latest firmware. Also, the router is lacking 5ghz frequency bands that are open to use in India. The Archer A9(US) version page shows a latest release that has wifi performance improvements. Why the EU version is left behind with buggy firmware?

@prashant.s  and Kevin_Z

I am facing the same issue. My case is the worst. I have tried with all the permutation and combination of settings configurations but 2.4 GHz is not at all working. I have been using this router for the last two months. Should I downgrade the firmware? if yes then which version and where can I get? If fixes are available then where can I get?

@Kevin_Z 

Hello, My issue initially started like the same as Mr.  prashant.s as he has mentioned in the thread dated 2020-07-12 15:36:15.

Here is my response/ reply: 

1.All your 2.4GHz wireless devices can not see C9's network or only some of them? Please ensure that the Wi-Fi LED on the router is lit up.

  - My router model: Archer A9 not C9. All the devices are able to see (and connect) the 2.4GHz wireless but after getting connected to wireless, the connection is getting dropped very frequently from all the devices (between 2 minutes to 5 minutes).  Yes Wi-Fi LED is lit up all the time as I don't have any problem with 5GHz.

2. You can login to the web UI and change some wireless settings to give it a go.

Note: For the 2.4GHz wireless channel, 1/6/11 is recommended, and for channel width you can use 20MHz. 

 - Yes, as I had mentioned in my earlier message that I have tried with all the permutation and combination of settings configurations. But the problem persists.

If it still cannot be detected on all devices, you can hard reset the C9 by holding the reset button/hole for 10s with the router powered on, then check if you can see its default Wi-Fi network.

2020-07-12 15:36:15

Need your suggestions on the firmware up-gradation/ degradation. Which version and where to get?

@Kevin_Z 

Here is my response/ reply in BLUE.

Does this 2.4GHz disconnect issue happen when you just purchased it or it happened recently?  NO.

Try to run a Wi-Fi scanner to find a clear channel for your network, try to lower down the Wi-Fi transmit power a little bit, then reboot the router and monitor. Already tried several times.  I am using channel no. 6 (after scanning for the clear channel). Lowered down the transmit power from High -> Middle -> Low.

Have you tried to reset the reconfigure the A9? Give it a go. Yes, I did.

How many devices are connected to the A9 in total, wired, and wirelessly? Wired - 1, device, Wirelessly: 5

How many of them are connected to the 2.4GHz? 2 devices

What are they? Laptop and 1 Cell Phone.

Are they get disconnected at the same time? No. Laptop gets disconnected within 1-2 minutes (and reconnected automatically ~5 minutes) and the Cell Phone gets disconnected and reconnected  within 1 minute)

and When they got disconnected, can you reconnect or it just shows unable to connect? After reconnecting the wifi it takes time to get the internet but within 1 minute it gets disconnected.