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How to perform a factory default reset
Important: This erases all settings and saved profiles. The settings erased include Access Control and RADIUS settings.
Follow these steps:
Unplug the AirPort Express from the power outlet.
Press and hold the reset button.
Plug AirPort Express back into an AC outlet (still holding the button).
Continue holding the button until you see the light flash rapidly, which should happen after a few seconds.
Release the button.
As with a hard reset, the AirPort Express will not be visible in the AirPort menu item or AirPort Admin Utility for a short time. Remember that this whole process takes approximately 45 seconds to complete. You may then use the AirPort Express in its default state or reconfigure it using either the AirPort Express Assistant or AirPort Admin Utility.