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The reset button is a small, circular button normally found on the back of the router and labeled accordingly in red ink. The “Power” LED should blink as you press and hold the reset button. Older Linksys routers may require you to press and hold the reset button for 30 seconds.  Your router password is now reset, and the default password should be left blank when logging into the router.

Summary:
Locate the “Reset” button on your Linksys router. Verify that the router is powered on, then press and hold the reset button for at least 10 seconds. Disconnect and reconnect the router to its power source after the reset is complete. Wait for the “Power” LED to remain in a solid state, which should take approximately one minute after you’ve reconnected the router to its power source.