Is it possible to change the Connection Order in the Web UI.
So USB tether takes precedence over the connected cable connection.
How can this be achieved?
For the Gl-iNet Graphical User Interface or Adim Panel I don’t believe so. It involves doing some SSH and renaming stuff.
So does that mean after a firmware update. Whatever custom changes made, they are overwritten and need to be added again?
So for you particular setup I want to say maybe but I’m not a 100% sure. I usually don’t have any issue creating a config File in LuCi and uploading after a firmware update. Also once its done the USB works differently so I assume it won’t transfer nicely after update. Load Balancing is it what you are looking for. It can be done in openwrt 21.xx. I do see that MWAN3 is already installed as a package.
The luci-app-mwan3 can also be installed(I think this is what you want but am not familiar with setting it up.) Try re-posting asking for help setting up MWAN3 in LuCi on this forum or openwrt forum.
You can edit the /etc/config/mwan3 by logging in via SSH, or install the luci-app_mwan3 package that adds the function LuCI → Network → Load Balancing.
Also, check the metric values in /etc/config/network to follow the same priority.
The config files are “usually” not overwritten on firmware update, but it depends on the nature and compatibility of the new firmware.
I do not work for and I do not have formal association with GL.iNet