In order to hard reset your Actiontec GS503AD3A-01:1. Locate the reset button, use a stylus, a ball point pen tip or a paperclip to press and hold the Reset button for approximately 30 seconds.
2. Release the button and wait for the GS503AD3A-01 to reboot itself
3. Wait 15 more seconds before the reset is complete
To find out your router default username and password continue reading