How do I check for and download firmware updates for the HP Color LaserJet Pro M255 M256?
Go to www.hp.com/support/ljM255 and select your printer or category from the list, then click Drivers. Select your operating system, click Next, then select Firmware and click the Download button. (Page 9)
From the official HP Color Laserjet Pro M255 M256 Printer manual, page 9
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