What is the procedure to manually print on both sides using my HP LaserJet Pro MFP series printer?
To print double-sided manually, first select Print > Printer Properties/Preferences in your software program. Under Layout settings, choose the Manual Duplex option and specify binding preferences as needed. After printing one side, reverse the order of printed pages back into the input tray to print the other side.
From the official HP Laserjet Pro M125a Mfp manual, page 24
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