I am facing the exact same issue. I am trying configure my range extender (was previously working) via web GUI to extend an existing wireless network's coverage I reset my TP-Link WiFi extender (using a pin) and then connect to the TP Link SSID. go to the url http://tplinkrepeater.net/ and straightaway get the page that says : Username or Password is incorrect. Please refer to the troubleshooting below: Is the "Caps Lock" enabled on your keyboard? The username and password must be lowercase, please ensure that the "Caps Lock" LED is disabled on your keyboard and try again. Forgot your username or password? Please reset this device to the factory default settings if you have forgotten your username or password. The default username and password are both set as "admin". Note: The settings will be restored to factory default after the resetting. How to restore this device to the factory default settings? Firstly locate the reset button on the rear panel of the unit, whilst this device is powered on press and hold the reset button for more than 5 seconds, this device will then reboot and restore itself to the factory default settings. I have tried accessing the webGUI from different laptops, mobiles, ipad and I get the same page. How can we solve this? thanks

Though I am able to ping 192.168.0.254 but when I put this IP in the browser I get nothing (page cannot be displayed, etc)... I get the same page that says username and password is incorrect if i open the url tplinkrepeater.net