@ThanhNguyen What is the model number of your device? How many devices will connect to the wireless network at once? Is there any error message if they cannot connect? Nice day.

@link_user Try to change another web browser or device to access the web UI. Have you ever tried to skip the step to choose country? Or you can leave it by default and change it back after...

@lukasbb Sorry, we are not familiar with the Ubiquiti device, what is the Ubiquiti USG? Is there any internet source existed? How do you connect the MR600 to the USG device? Besides, the Archer MR600...

@Bponon_Limited You can refer to the overview/spec page and user manual for more information. https://www.tp-link.com/support/download/tl-wr841n/#video Besides, do you have any network request? And...

@CH72 How do you connect the ISP router to the internet, by ethernet cable or telephone line? If it is telephone line, you can plug it into the DSL port of the D5; the username and password are given...

@scz So the Archer C20 works as an access point now? Can you access the web UI with its LAN IP address and port number? Try to open the port for C20 on the main router, and ensure that the internet...