Nothing unusual here. It's unusual that on 2.4 GHz band your association speed is only 144mbps.

The ideal scenario would be that Huawei device is in bridge mode and use the Archer device in router mode, but you can use the Archer device in router mode even Huawei device is still in router mode....

@asdfasdfasdf See this story. For now it can not be disabled. This could be made by feature in future FW release.

Enforces a referer check, which will prevent cross-site request forgery (CSRF) attempts that try to remotely force a connected client into interacting with router’s page.

That's probably because of the OneMesh feature.

Support page Usually that's the page for contacting the tech support, but due to the Covid-19 situation there may have been some changes. I am pretty sure that community administrator can guide you...