@terziyski I already configured RE as AP mode. And FW version is the latest, as you can see below.

@Joseph-TP It is both wired and wireless speed of the router. If I connect to router via ethernet cable, I get 14 mbps. Also if I'm near the router and connect via Wi-fi, I get almost the same speed....

My TL-WA850RE extender is connected to the router via ethernet cable. My normal internet speed is about 14 mbps. But when I connect to extender's Wi-fi, my speed is about 8 mbps. I thought because...