如何更新打印机固件？
在控制面板上按下“OK”按钮，滚动到服务菜单并选择激光打印更新。最后选择立即检查更新来启动固件更新流程。（Page 11）
From the official HP Laserjet Pro Mfp M426 M427 manual, page 11
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在控制面板上按下“OK”按钮，滚动到服务菜单并选择激光打印更新。最后选择立即检查更新来启动固件更新流程。（Page 11）
From the official HP Laserjet Pro Mfp M426 M427 manual, page 11
Answers from the official manual.
Common questions