Under such environment, better to use powerline extenders such as TL-WPA8630kit if they are all under the same electrical circuit

RE305 or RE200 do not support LAN cable connection to router RE350 , TL-WA860RE( V2 ) , RE450( V1 ) , RE400 support access point mode. See this FAQ and click on This Article Applies to:...

The 850RE has the same SSID with the main router or has different SSID? Better to set on different SSID to test the speed What's more, also check the link speed when PC or phone connect to the...

Is your router also a dual band with both 2.4G and 5G ? Better to check the 5G network on your router first. If the router also support 5G, reset the range extender and reconfigure it. Share this FAQ...

To verify whether it is the PPPOE username and password issue, you can reset the modem to factory default. It will in bridge mode, then setup the PPPOE connection on your computer:...

Have no ideal, suggest you contact with tp-link support team support.in@tp-link.com, they all response