How do I perform a factory reset?
To return the device to its default settings, press and hold the Power button for 10 seconds until the LED flashes red. This clears all current configurations and resets the printer back to initial conditions. Remember that after such resetting, reconfiguring Wi-Fi settings and pairing devices will be necessary (Page 23).
From the official HP Laserjet Pro P1102w Drucker manual, page 23
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