Myth. Disregard.
Depending on your level of technical comfort, these are the primary ways to address a locked BIOS: How To Reset Bios Password Hp Elitebook 840 G3
When prompted for the password, enter any incorrect password three times. How To Reset Bios Password Hp Elitebook 840 G3
Contact HP Support and provide your serial number and proof of ownership. They will email a customized file. Save this file to the root of a FAT32-formatted USB drive. How To Reset Bios Password Hp Elitebook 840 G3