The easiest way to hard reset any TP-Link router is by using the small reset button on the back. This method is useful if you don't want to access the app or web portal and are close to the device.

Steps to reset using reset button:

Find the reset button on your router, which may be on the front or back panel, depending on the mode is the first step to Reset Tp-Link Router.
Press and hold the reset button for more than 5 seconds using an object such as a paper clip.
If you see a 2-in-1 WPS/Reset button, you may need to long press the button to initiate the reset.
Release the button when you see the LEDs flashing rapidly.
Finally, reboot the router and let it go back to its original factory settings.

https://sites.google.com/site/resettplinkrouter