@domwild Archer MR200 v1 supports wireless router mode. In this mode its LAN4 port works as a WAN port.

@Leyouyuan Make sure you're with the latest FW on your RE - here. Update it if necessary and test again. Here's how to upgrade the RE firmware.

@xpector As a start you could try to revert back to the previous FW release - Archer C6_V3.2_1.0.15 Build 20220923 manually. Just look at the device bottom sticker to see what's your FW region to...

@pkrisz74 If you want to connect TD-W9980 to your main wireless router wirelessly you can try its WDS feature - details.

@giesk910 Contact your retailer (if under warranty) or your local support - the RE may went faulty.

@Eddie2024 Onemesh is TP-Link proprietary technology. To be able to build Onemesh you need a Onemesh capable router and range extenders. Easymesh is a new standard that most of mesh capable routers...