XT9 Guest Network only working for WiFi 6 devices after firmware Update

[nihil]

After updating the firmware to 3.0.0.4.388_24709-g15d5e47 on my XT9 mesh system (3 nodes), the Guest Network stopped working for older devices, including:

• Nokia 7 Plus – Wi-Fi 802.11 a/b/g/n/ac, dual-band
• OnePlus 2 – Wi-Fi 802.11 a/b/g/n/ac
• Samsung Galaxy Tab S5e – Wi-Fi 802.11 a/b/g/n/ac, dual-band

The main (non-Guest) network works fine for these devices. The Guest Network, however, only works for Wi-Fi 6-capable devices.

Before the firmware update, all my devices could connect to the Guest Network without any issues. The problem started after the upgrade.

Disabling Wi-Fi 6 compatibility (Wireless -> General -> 802.11ax / Wi-Fi 6 mode -> Disable) didn't help—older devices still can't connect.

Any idea how to fix it?

P.S. I connected a cheap Wi-Fi 6 travel router to one of the XT9 nodes via Ethernet and created my own Guest Network. It works with all my older devices... but c'mon, Asus.

[Aureliannn_ASUS]

Hi @nihil ,

Thank you for your inquiry. 

To better understand the guest network connectivity issue you are experiencing, please provide the following information:

1. Guest network settings confirmation: Is your guest network option only set on the main router in the AiMesh network? Please note that AiMesh nodes do not have guest network function options. [Wireless Router] How to set up Guest Network on ASUS Router? | Official Support | ASUS Global
2. Router reset test: Have you tried performing a hard reset on the router and then reconfiguring it to confirm whether all devices can connect successfully? [Wireless Router] When Standard Reset Isn’t Working: Hard Factory Reset - Models list | Official Sup...
3. System problem report: If you still cannot connect after resetting, please assist in using the system's built-in problem reporting function to submit the relevant information.

Please follow the steps below to report the issue, and we will assist you:

1. Connect your device (PC, laptop, etc.) to the router, then open the Web management interface (http://router.asus.com/) and log in to your router.
2. Click on "System Administration" and select "Problem Report."
3. Fill in your region, email address (required), ASUS service/case number, issue type, and a description of the issue.
4. Please read and agree to the privacy policy and relevant service terms.
5. Click "Send" to submit your form.

Additionally, please send us the following information via private message: product serial number, the time the problem report was submitted, the email used for the problem report, the time the issue occurred, the MAC address of your device, and a network architecture diagram of your current environment.

If your network is down, the UI page will generate a link for downloading offline data. Please click the link to download the data, compress it into a ZIP file, and provide a cloud link for us to analyze.

Thank you for your cooperation.

[shoLuapa]

I can confirm the exact same issue with my XT8 mesh system after upgrading from 3.0.0.4.388_24688 to 3.0.0.4.388_24709.

All my smart home devices, like lightbulbs etc., are unable to (re)join the 2.4GHz guest network.

@Aureliannn_ASUS can the team investigate and issue a fix for this please?