New Flint 3 firmware incredibly unstable

After updating to the latest v4.9.0 firmware the other day I have had consistent and major network connectivity and stability issues as websites would often show up as ERR_ADDRESS_UNREACHABLE and otherwise leave all services (often including the router’s own interface) entirely unaccessible from my desktop computer connected over ethernet. Wireless devices such as my phone also suffered network problems and would result in my phone using cellular data because it could not get an internet connection out of Wi-Fi. I have since rolled back the firmware and restored a backup I took right before the firmware upgrade to the router as a mitigation effort for the time being until I could solve my problems.

I had tried toggling network acceleration on/off and also switching between software and hardware acceleration to no success, trimming my adguard blocklist even further showed no change, and no other troubleshooting steps revealed any solution. I didn’t change any settings once I upgraded and so the only thing that I changed was the firmware version when I upgraded and so I believe the upgrade was the root of my problems. Restarting the router would temporarily fix some of my internet problems like on my desktop before eventually websites would become unreachable.

Anyone else having these issues or know of a potential fix?

Hi,

The ERR_ADDRESS_UNREACHABLE error is usually related to DNS resolution or IP address connectivity issues.

Could you please help check the following after the issue occurs:

  1. Check whether the PC or phone still has a valid IP address at that time.

  2. Run the following commands to check whether DNS resolution is functioning properly:

    # Windows (Command Prompt)
    nslookup google.com
    tracert google.com
    tracert 8.8.8.8
    
    # macOS / Linux
    nslookup google.com
    traceroute google.com
    traceroute 8.8.8.8
    

    (Please replace google.com with the actual website domain that is experiencing the issue.)

  3. If you are currently using the VPN Client feature, please try disabling it to see whether that helps.

  4. Please export the device logs and send them to us via private message for further analysis.

How to export logs:

How to send private messages: