How do I check for and download firmware updates for the HP LaserJet Pro M304/M305?
Go to www.hp.com/support/ljM304 or www.hp.com/support/ljM404, select your printer if prompted, and click Software and Drivers. Select your operating system, click Next, then select Firmware and click the Download button. (Page 4)
From the official HP Laserjet Pro M304 M305 manual, page 4
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