@Bharath Good day. Thank you very much for your patience. For your case, we might need your help to check the following information for further analysis. Is your main router Archer C1200, or C6/C5?...

@Gavzda Good day. For your case, no matter It is wirelessly connected to the router, or by Ethernet cable as the access point mode, RE505x would broadcast AX Wi-Fi. But since the main router is AC...

@Aliyow Good day. Thank you for your patience. Have you tried to log in via http://tplinkrepeater.net ? If still not able to log in, please reset the RE200 by holding the reset pinhole/button for 10s...

@Blue1234 Another post: https://community.tp-link.com/en/home/forum/topic/221386?replyId=476478 Q6. How to set up a mesh network when there are more than two repeaters joining into the network? A6....

@MichalSel Good day. Thank you for your patience. May I know the model number of your main router? And did you set up via WPS button? If yes, could you please also use the Tether APP to have a try:...

@Jofamaru Good day. Thank you for your patience. May I know the model number of your main router? Could you please try to forget the profile again to double check that you had the correct Wi-Fi code;...