This is the most reliable "built-in" way to reset the password without hardware modification, but it requires prior setup.

While researching “hp elitebook 840 g6 bios password reset work,” you will see dangerous advice. Here is the truth:

This is the only built-in software recovery method. It only works if you previously set up "SpareKey" and configured three security questions.

If official methods are unavailable, technical workarounds involve hardware manipulation or specialized software: