@Clive_A or @Vincent-TP, today I ugraded the firmware of my ER706W router of my second site from version ER706W(EU)_V1_1.2.0 Build 20250428 via version ER706W(EU)_V1_1.2.1 Build 20250821 to version ER706W(EU)_V1_1.2.2 Build 20250821.

After the upgrade DNS resolving of wireless clients doesn't function anymore. This results in that wireless clients cannot connect to internet anymore. It used to work fine until I upgraded the firmware.

(I am not able to test if it also affects wired clients because I don't have any wirde clients at this moment. I will test that later this weekend)

Edit: It also affects wired clients.

Even setting the DNS Server of the respective WLAN from Auto to Manual and using any DNS service (Cloudflare, Google, OpenDNS) does not solve the issue.

I am able to connect my laptop though to internet via VPN from the laptop to my main site (with ER605 router). So there is internet connectivity on the ER706W router, it just doesn't reolved DNS for wireless clients.

According to the release notes it is not possible to donwgrade to version 1.2.0 anymore: "Once upgraded to version 1.2.1, you will not be able to downgrade to previous version. Contact Omada technical support if downgrade is required."

Does anyone recognize this and know how to solve this? Or how to downgrade back to version 1.2.0?