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Upgrading ER8411 v1.20 from firmware 1.3.1 Build 20250611 Rel.68769(4a50)

Upgrading ER8411 v1.20 from firmware 1.3.1 Build 20250611 Rel.68769(4a50)

Upgrading ER8411 v1.20 from firmware 1.3.1 Build 20250611 Rel.68769(4a50)
Upgrading ER8411 v1.20 from firmware 1.3.1 Build 20250611 Rel.68769(4a50)
Monday - last edited Tuesday
Tags: #Network Connectivity
Model: ER8411  
Hardware Version: V1
Firmware Version: 1.3.1

Hi everyone,
 

I am currently facing persistent stability issues with my ER8411 v1.20 (Japan Model) and I am seeking guidance regarding firmware updates, as I am concerned about potentially bricking the device.
 

Current Status:

  • Firmware: 1.3.1 Build 20250611 Rel.68769(4a50)

  • Hardware: ER8411 v1.20

  • Location: Japan (Purchased via TP-Link Japan)
     

The Issue: After 3 months of stable operation, the router started experiencing intermittent failures. The Admin UI becomes completely inaccessible, and while the download traffic continues to flow (reaching up to 7.2Gbps), the upload traffic drops to ZERO. A simple reboot restores full functionality, but the issue inevitably recurs. I suspect a memory leak or a process deadlock in the firmware.
 

My Concerns regarding Firmware Upgrade:

  1. Missing Official Version: The firmware currently installed on my unit (1.3.1 Build 20250611) does not appear in the official TP-Link Japan or Global download centers.

  2. Hardware/Version Mismatch: On the community forum, I found a Pre-Release firmware (1.3.3 Build 20250930), but the documentation states it is only applicable to ER8411(UN) v1.0 and v1.6. I am hesitant to flash this, as I fear it will either brick my unit or remove the MAP-E (v6Plus) support which is critical for my Japanese ISP connection.
     

My Questions:

  • Is my current firmware (1.3.1 Build 20250611) a specific regional build for the Japanese market?

  • Where can I find the official, validated firmware updates for the v1.20 Japan model?

  • Is there a specific support channel for TP-Link Japan business hardware, or am I forced to use the generic global resources?

I would appreciate any advice from the community or TP-Link staff on how to proceed without compromising the device's functionality.
 

Best regards,

 

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Re:Upgrading ER8411 v1.20 from firmware 1.3.1 Build 20250611 Rel.68769(4a50)
Yesterday - last edited Yesterday

Hi  @Dan111 

Thanks for posting here.

Your firmware is a special Japanese version and cannot be upgraded to the EN firmware. The next version of the firmware is currently being prepared.

 

Regarding the issue you encountered, please give us the following information:

1. When the issue happened, was the Internet of the network access affected? Or is the only issue that the web UI can't be accessed?

2. When the issue happened, if ping the router's LAN IP address on the management PC, will it get a reply?

3. A simple reboot restores full functionality, but the issue inevitably recurs.

>>>Around how long will the issue recur?

 

4. So you only manage the router via its standalone web interface, no Omada controller involved, right?

Wish you a happy life and smooth network usage!  Help Us Improve - Omada AP Installation Guide >Get the Latest Omada SDN Controller Releases Here< >Get the Latest Firmware Releases for Omada Routers Here< >Experience the Latest Omada EAP Firmware<
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Re:Upgrading ER8411 v1.20 from firmware 1.3.1 Build 20250611 Rel.68769(4a50)
Yesterday

  @Vincent-TP 

 

Hi Vincent,

Thank you for the update regarding the firmware status. Given the critical nature of this device in a business environment, I have performed a forensic analysis of the instability to assist your engineering team in accelerating the fix. Please find the technical details below:

1. Data Plane vs. Control Plane: The issue is not limited to the Web UI. The Data Plane (routing/forwarding) is severely affected. During the instability phase, I experience severe packet loss and throughput degradation, confirming that this is a system-wide memory exhaustion issue affecting the network stack and not merely an interface hang.

2. LAN Connectivity: Yes, the LAN IP remains pingable, but with significantly increased jitter and latency. This confirms the CPU is not fully locked, but the kernel is struggling with resource allocation, specifically in the buffer management for the IPoE/MAP-E stack.

3. Recurrence Pattern: The recurrence is deterministic and correlates directly with the DHCPv6 lease renewal cycle. By default, the system enters this degraded state every 24–48 hours, coinciding with the renewal period. I have implemented a workaround by increasing the lease time, which mitigates the frequency of the failure but does not solve the underlying memory leak in the Japanese firmware integration.

4. Management Mode: I am managing the router exclusively via its standalone web interface. There is no Omada Controller involved in the current topology.

Additional Technical Context: For the engineering team's awareness, this is a hardware unit labeled "UN" (Universal) running the "JP" (Japanese) firmware version. I suspect the memory management issues stem from the porting of the Japanese-specific protocol stack (MAP-E/IPoE) onto the universal hardware base.

I have maintained detailed logs of the memory utilization spikes and session states. I expect that the "next version" of the firmware you mentioned addresses this leak at the kernel level rather than just providing a cosmetic fix for the UI.

I look forward to receiving a concrete timeline for the release of the corrected firmware.

Regards,

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