Hard reset TP-LINK TL-WR940N

Factory reset (Hard reset) The reset button is on the rear panel and is used for both WPS and Reset function. To use it as a RESET button, press in the hole with a pin for more than five seconds. Release and wait for the reboot process to finish.
Firmware Firmware link
Default username admin
Default password admin
Default IP address 192.168.0.1