Where can I find help for firmware updates and advanced configuration on the HP LaserJet Enterprise M406?
For information on firmware updates, advanced configuration using the Embedded Web Server, and remote and mobile printing, visit www.hp.com/support/ljM406 or www.hp.com/support/ljM407. You can also press the Help button on the printer control panel to access Help topics directly. (Page 4)
From the official HP Laserjet Enterprise M406 manual, page 4
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