How do I reset the HP LaserJet Pro P1102 to factory settings?
Press and hold the cancel button on the control panel for 5 seconds until the ready light blinks. This clears all settings and returns the device to its factory defaults. You will need to reconfigure network settings and reinstall any necessary drivers after resetting. (Page 23)
From the official HP Laserjet Pro P1102 Drucker manual, page 23
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