Some advanced users attempt brute-force scripts using the HP BIOS Configuration Utility from within Windows, though this carries high risk of bricking the BIOS chip .
Officially, HP Support states they cannot reset forgotten BIOS passwords for G6 models and may require a system board replacement at your cost. hp elitebook 840 g6 bios password reset work
Resetting the BIOS password on an HP EliteBook 840 G6 is significantly more difficult than on older models. HP's official policy for modern business PCs is that they cannot reset a forgotten BIOS password; the official solution is a complete system board replacement Some advanced users attempt brute-force scripts using the
I tested shorting the RTC_RST pads (near the SSD slot) and pulling the coin cell for 24 hours. Result: Time reset, BIOS password remained. Don't waste your time. hp elitebook 840 g6 bios password reset work