Hard reset TP-LINK TL-WR841N

Factory reset (Hard reset) Power ON the router and locate the reset button on the back panel. Press it and hold until all the LED turn on momentarily. Release and wait for the router to reboot to it’s default settings.
Firmware Firmware link
Default username admin
Default password admin
Default IP address 192.168.0.1 or 192.168.1.1