How do I factory reset my AiRROBO P20 vacuum cleaner?
Press and hold the Clean button() and Home button on the robot for 3 seconds, or press and hold the Reset Wi-Fi button on the remote control for 3 seconds until you hear a voice prompt. This clears settings and returns the device to factory defaults.
From the official Airrobo P20 Robot Vacuum Cleaner manual, page 10
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