How do I connect my HP Envy Pro 6400 All-in-One printer to Wi-Fi?
Follow the instructions in the HP Smart app to connect your printer to a network. If connecting via Wi-Fi, make sure your computer or mobile device is near the printer during setup. For troubleshooting and tips on Wi-Fi connections, refer to the Reference Guide.
From the official HP Envy Pro 6400 All IN One Printer manual, page 2
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