@Drukara727 Reset the RE to its factory defaults by the reset button (press for about 10 sec) and re-connect to the router from scratch. If the issue persists contact your local support for...

@andre123334 Reset the RE to its factory defaults either via the WebGUI or by the reset button and follow this guide for configuring.

@Kr_65 The WPS method is pretty straight-forward to use - use this video for a reference.

@MPDC Use this guide for configuring C80 in AP mode (Case 1). Set a static IP address so you can easily access the router WebGUI. For example 192.168.0.254 if your main router is in 192.168.0.0./24...

@Mr-Wifi If you open the modem router tech specs - its clearly stated that: Acccording to this v5 shouls support telnet management as well.

@Mr-Wifi Check this thread for more details on TD-W8961N telnet management.