@rhuanjk
Hi, A hard reset will restore your device to factory default settings.
Before resetting the router, please make sure the power source is stable, an unexpected power outage during the reset process might brick the Router.
There are two methods of resetting the Router:
1. Through the hardware reset button:
Press and hold the WPS/RESET button (more than 10 seconds) with a pin until the SYS LED becomes quick-flashing. Release the button and wait for the Router to reboot.
2. Through the web management interface:
Log in to the Router's management interface, go to Advanced > System Tools > Backup & Restore -> Factory Default Restore Section > click "Factory Restore" and confirm, wait for the Router to reboot.