Hard reset TP-LINK AC3150 / Archer C3150 V2

Factory reset (Hard reset) Locate the reset button (hole) on the side of the router. With the device powered on, press and hold the Reset button for at least 5 seconds – all LEDs will light on Then release the button and wait the router to reboot to its factory default settings.
Firmware Firmware link
Default username N/A
Default password You set it at http://tplinkwifi.net
Default IP address