I'm trying to speed up the adapter connection. I'm getting around 100 Mbps on my PC through my extender, but my connection is faster (around 250 Mbps even using WiFi). I tried changing both Ethernet cables with 5e and still not working. This is how my router LAN settings looks like:

It recognizes the extender on the third port, but says its speed is 100 Mbps. I tried plugging a laptop directly to the router (with 5e cable) and its speed was 1000Mb/s.

At the same time the tpPLC shows higher connection speeds

And in windows adapter config I get 100 Mbps, even after changing Ethernet device speed to 1,0 Gbps.

I don't know what's wrong and I tried a lot of things, not of them working. Sorry if this is a stupid question or has been answered before, I couldn't find anything similar to my problem. Thanks in advance!