How do I factory reset my PetSafe Microchip Cat Flap?
Press and hold the button in the battery compartment for 15 seconds until the LED flashes quickly. This action resets the device to automatic mode, clears all settings, locks it, and deletes stored microchip IDs.
From the official Petsafe Ppa44 16427 Microchip Cat Flap manual, page 7
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