I want to use archer c80 as an ap, but idk why the ethernet status always stuck at 100 mbps in ap mode, cannot open internet port negotiations in ap mode so can't change it, but if i use it in router mode its show 1000 mbps. So how i can make the port negotiations stay in 1000mbps even in ap mode?

My main router is ax 12 and already set it at 1000 mbps full duplex in internet negotiations, and connected to wan/internet port of c80.