How do I check for firmware updates for the HP LaserJet Pro MFP M428/M429?
Go to www.hp.com/support/ljM428MFP and, if prompted, select the printer and click Software and Drivers. Select your operating system, click Next, then select Firmware and click the Download button. (Page 5)
From the official HP Laserjet Pro Mfp M428 M429 manual, page 5
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