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.

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