@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.