@Vlad123 

Many thanks for the reply. 

I think we'll stay on the firmware that is working.

My concern was (is) that there are potential security issues with such an old version of firmware. 

But do you patch the security, only to lose functionality? 

We also have an issue with a WR940N V6 that won't accept firmware upgrades. 

Maybe we need to consider alternatives such as Ubiquiti?

Any thoughts 🤔

I use an ER8411 V1 with 2 internet connections and as a Wireguard VPN server. Since updating to the latest firmware version 1.3.6, my ER8411 freezes every 3 or 4 days... I had to schedule a daily reboot; even a weekly reboot isn't saving me from the freezes.

I disabled all other options: load balancing features, firewall protection, leaving only what I really need, which is the functionality to receive 2 internet connections and establish a VPN session with Wireguard, but I still have the freezes. During the freezes, the ER completely stops responding, the web interface doesn't load, and even pinging its local IP doesn't work. The interface lights remain on during the freeze. The only way to resolve it is by removing both power cables.

  @Vincent-TP This fixed my port 3 LED illuminated (with nothing connected) and data showing in the router ports page issue! I got my router replaced under warranty because TP-Link thought it was a hardware failure. The issue came back on the replacement. This firmware fixed it!

  @Vincent-TP 

for me this fixed the issue, everything is working and I am not confident in updating :) I will not update for a very long time now  ER8411_v1 _1.3.6_20251230-rel61614

  @Vincent-TP 

Thanks. I just updated to firmware beta 1.4.0 - I'll be monitoring the device.

@Vincent-TP

Many thanks, updated to beta 1.4.0 successfully. After the first 24hrs, it looks fine for me.  

  @Vincent-TP This update does not have the MTU problem HOWEVER my IPv6 is now broken. it wont connect anymore. Might this be related to the MTU fix you applied?

EDIT: It seems that my provider changed a configuration its not the update. its now solved.
 

  @Vincent-TP It will not connect any more. Settings are still as they where before the update and according to spec of my provider (PPOE, 48 prefix and DHCPv6).

Here it shows that it wont connect:

I tried to restart the ipv4 PPOE connection as the IPV6 connection is carried over it. and restart the gateway itselves but to no succes.... When i plug in the router of my provider it just works as it used to on my TP-Link gateway...