How do I perform a complete product reset on the HP Envy 6400e?
With the cartridge access door open, press and hold the Power button for at least five seconds to perform a complete product reset. This will clear all your personal data, settings, and network information from the printer. You will need to set up the printer again after the reset.
From the official HP Envy 6400e All-in-One Printer manual, page 12
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