How do I upgrade the BIOS on my HP Z840 Workstation?
Go to http://www.hp.com/go/workstationsupport, select Download Drivers and Software, and locate the latest BIOS version available for the workstation. Compare it to your current BIOS version, and if a newer version exists, download it and follow the instructions in the release notes to complete the installation.
From the official HP Z840 Workstation manual, page 39
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