What actions must I take if troubleshooting is needed?
Please visit www.hp.com/support/ljE42540MFP or www.hp.com/support/colorljE47528MFP for comprehensive assistance on firmware updates, advanced web server settings, and other network-related issues.
From the official HP Laserjet Managed Mfp E42540 manual, page 8
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Answers from the official manual.
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