HP Officejet Pro 6978 is one of the advanced printers which is capable of offering the most professional performance to users. If you want you can connect HP Officejet 6978 to wifi by following the steps in our post on hp officejet 6978 wireless setup.
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HP Officejet Pro 6978 Wireless Setup | HP Officejet pro 6978 Connect to Wifi
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HP Officejet Pro 6978 Wireless Setup | HP Officejet pro 6978 Connect to Wifi

Don't know how to connect hp officejet pro 6978 to wifi? Then check this post which explains the process of hp officejet pro 6978 wireless setup