@Wynal Hi, I think they are OK, but note the switch TL-SF1006P is an unmanaged switch and can not be managed by OC200. And EAP115 only supports 2.4G.

@VictorWalker Hi, I'm not sure what you mean. Would you be able to provide some more information on what you are seeing or how this is setup (APs types, connections, firmware versions etc). ? Any...

@Vilhjalmyr Hi, have you tried changing a short cable to test? What about the link speed on the PC?

@Ric04jan72 Have you tried doing an Iperf3? How to use Iperf to test the speed

@NETMANJA Check it on the EN website, you will find it: https://www.tp-link.com/en/support/download/cpe710/v1/#Firmware

@DominikP Hello, did you enable IGMP on the ER605 either? You can also try to upgrade the ER605 firmware to 1.2.3 to test.