Factory Resetting your D60 Gateway can be done in 2 ways.
Option 1: Using the D60 Router GUI
Once logged into the GUI, use the navigation options on the left to navigate to 'System' ➝ 'Reboot/Reset'.
Option 2: Using the Reset Button on the Back of the D60
Use a paper clip to press and hold the reset button in and hold it (all LEDs will blink while you hold it) for 10-15 seconds. All LEDs will turn off when reset is complete.