@Black_Canary Try the default password first which is admin, if it does not work, I'm afraid that you have to reset it like Selin said and re-login with admin. Good day.

@Dougleigh Hello, what is the led status of the RE450 now? Try to forget the network and reconnect to the RE450's wifi; you can reboot the range extender as well. With computer connected to the RE450...

@shawly Hello, what is the current operation mode of the RE200? Is it access point or range extender? How did you log into the web UI of the RE200? With the IP address or the domain name? Try to log...

@Hasan_3000 May I know why do you think there is a compatibility issue? Please provide more information. What is the current led status of the TL-WA850RE? Have you ever configured it with the main...

@AndriusVs Thanks for your reply. You can take more time to test whether it works after the downgrade. Any updates, please let us know.

@PavelR @panda2005 Thanks for your valued information. Have you ever tried to enter the password manually? Do not use the reserved password on the browser or paste it. Meanwhile, you can unbind the...