After you successfully configure the extender, the SSID will change intot the same as your main router's Wi-FI. You may power off your main router to see whether you still can detect the same ssid...

If you can't connect to the default wifi to login, you may connect it to your computer via a cable. Then, login to the web UI to configure it. Perhaps this link will help you....

After you successfully set up the RE450, the Wi-Fi name will change into the same as your main modem. Except you set a different SSID on RE450 when you configure it. You can refer to this link to...

Do all your wireless clients meet the same issue? Try to set a fixed wireless channel on TL-WA801ND.

nqserv wrote Until now by the official source the following 3 TP-Link models are affected: R600VPN TL-WR741ND TL-WR841N Source: https://blog.talosintelligence.com/2018/06/vpnfilter-update.html I...

What's your hardware version? Did you update the FW to the newest one? Try to set a fixed wireless channel. If the issue still exists, it's better to contact tplink support via email or hotline to...