What should I do if my HP EliteBook 820 G3 Notebook PC displays an error code related to the BIOS?
To resolve BIOS-related issues, start Computer Setup and restore factory settings from there. Alternatively, update the BIOS version by determining your current version, downloading a suitable update from HP Support, and then updating it via Computer Setup.
From the official HP Elitebook 820 G3 Notebook PC manual, page 67
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