Hey, have you tried reset the router and reconfigure it? Reset usually help us solve many problems.

mazhdrak wrote Model : Hardware Version : Firmware Version : ISP : Hello guys, Yesterday, by mistake i've installed the latest US firmware Archer C9(US)_V1_180125 for my v1 version. However now i am...

In that case, it's recommended to email tp-link support with the detailed product information for a test or any further help.

You mean even the router can't work about one hour? How about change another wireless channel on your router?

Hey, the range extender wifi name will disappear once it has been installed successfully. It will turn into the same wifi name as your main router. You will no longer to see TP-Link~

If you login to your router's DHCP client list, can you see RE305? If yes, it means RE305 has successfully connected to your router. Restart your router and check whether you set any filtering on...