How do I check for and download firmware updates for the HP LaserJet Pro MFP M428/M429?
Go to www.hp.com/support/ljM428MFP, select your printer if prompted, and click Software and Drivers. Select your operating system, click Next, then select Firmware and click Download. (Page 10)
From the official HP Laserjet Pro Mfp M428 M429 F manual, page 10
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