@buku The login username and password are both admin by default. If it does not work, please hard reset it by holding the reset hole for 10s and then relogin with admin. May it help.

@Neel You can go to official website to download the latest firmware and install it. Below is the download link: https://www.tp-link.com/support/download/archer-c6/#Firmware How to update the...

@JJMartin I see, you can return it and get a new device which supports QoS, like Archer C7, Archer A9 and Archer A10 and so on. May it help.

@SSMP Thanks for your requesting. First, except reboot the router, please check the system time of the Archer A9; you can login to the web UI locally and go to advanced-system tools-time settings to...

@Ismail_Hossain Sorry for that, so the TL-WR820N works in regular router mode and the wired connection is good, but wifi connection is unstable? Try to change some wireless settings to improve its...

@horace_vr Below is the instruction to setup the WDS feature to boost the wifi signal. https://www.tp-link.com/support/faq/227/ Please use the same password of the main router ( Archer C2) to...