RT-BE92U LAN issue after upgrading to the latest firmware

[ashishrc]

I am facing the following issue with both RT-BE92U_3006_102.5_0 & RT-BE92U_3006_102.6_0, whereas the initial release version RT-BE92U_3006_102.4_0 works perfectly fine.

The RT-BE92U LAN port behaves weirdly after upgrading to RT-BE92U_3006_102.5_0 & RT-BE92U_3006_102.6_0. Both versions exhibit the persistent behaviour, even after a complete router reset.
Before installingthe new 6.0 and 5.0 versions

After updating to RT-BE92U_3006_102.5_0 & 6.0

All 4 LAN Ports behave the same. Do you have any advice on what to do?

 

[Tech9]

How exactly do you measure LAN port 1-4 Ethernet throughput using cell phone? Just looking at the Wi-Fi signal icon the first test was done with good signal 3-bars, the second with weaker signal 2 bars. Did you check RSSI level and link speed to this client in System Log, Wireless Log?

 

[ashishrc]

How exactly do you measure LAN port 1-4 Ethernet throughput using cell phone? Just looking at the Wi-Fi signal icon the first test was done with good signal 3-bars, the second with weaker signal 2 bars. Did you check RSSI level and link speed to this client in System Log, Wireless Log?

I have a Google Nest router connected to the RT-BE92U LAN port, and I'm using Google Home to check this.

 

[Tech9]

What you did is wireless test from your phone with different strength signal to whatever your phone was connected. This is what your screenshots show. There is also a message on your screen saying "Speed test may show varying results depending on multiple conditions" with a link "Learn more". Did you learn more?

 

[ashishrc]

What you did is wireless test from your phone with different strength signal to whatever your phone was connected. This is what your screenshots show. There is also a message on your screen saying "Speed test may show varying results depending on multiple conditions" with a link "Learn more". Did you learn more?

Yes, I did it. It's generic help from Good Nest. https://support.google.com/googlene...770374278911-393583181&p=wifi_speed_test&rd=1

Key observation.

If I installed RT-BE92U_3006_102.4_0, all LAN ports work correctly without any errors.
If I upgraded to RT-BE92U_3006_102.5_0 or RT-BE92U_3006_102.6_0, all LAN ports show that abnormality.
So something has changed RT-BE92U_3006_102.4_0 to RT-BE92U_3006_102.5_0, which is impacting the LAN capability.

I have tried the official release
1. ASUS RT-BE92U Firmware version 3.0.0.6.102_38962 release date 2025/08/27
2. ASUS RT-BE92U Firmware version 3.0.0.6.102_38979 release date 2025/10/31
3. ASUS RT-BE92U Firmware version 3.0.0.6.102_38980 release date 2025/11/18
All versions work fine, no issues at all. However, I like the Asus Marline because it allows me to install custom applications, which is not feasible in the original version.