To perform a factory reset on a Linksys router, first, locate the small reset button on the device, usually found on the back or bottom. Using a paperclip or similar tool, press and hold the reset button for about 10 seconds until the router's lights blink. Release the button and wait for the router to reboot. Once the router has restarted, it will be restored to its default settings. It's essential to note that this action will erase all custom configurations, including Wi-Fi network names and passwords. If you encounter any issues during the process, consult the router's manual or contact Linksys Support at toll- free number +1–800–439–6173.