Because the password is stored in an EEPROM (Electrically Erasable Programmable Read-Only Memory) chip soldered to the motherboard, "shorting" pins or using generic "backdoor passwords" found on internet forums is ineffective and poses a high risk of bricking the device permanently.
Clamp the SOIC8 clip onto the BIOS chip. Match Pin 1 (there is a small dot on the chip and a red wire on the clip). Connect the clip to the CH341A.
If you cannot obtain the official tool, there is a well-known workaround for HP EliteBooks (G6 generation included) that involves booting the laptop without a keyboard attached.
Requirement:
Steps:
Note: This method does not work on all firmware versions, but it is a standard IT technician trick for older ProBook and EliteBook models.
Many older EliteBooks had a "PW" or "CMOS Reset" jumper. The 840 G6 does not. HPs from this era use a cryptographic handshake between the EC (Embedded Controller) and the PCH. Cutting power does nothing.
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.
Unlike the CMOS battery, the 840 G6 has a dedicated security unlock jumper hidden on the board. hp elitebook 840 g6 bios password reset work
Does this work? Yes, but only on pre-2020 BIOS versions (F.30 or earlier). If the previous owner updated to F.40+, HP disabled this jumper. You will need to downgrade the BIOS using a USB recovery stick before attempting the jumper.
BIOS passwords are a security feature designed to prevent unauthorized access to a device. Attempting to bypass or reset a BIOS password without proper authorization:
Legitimate reasons for resetting a BIOS password include:
This document describes authorized procedures for restoring access to an HP EliteBook 840 G6 when a BIOS (setup) password prevents boot or configuration changes. Two supported approaches are provided: (A) IT-approved reset via HP service/parts, and (B) hardware-level reset for authorized technicians. Do not attempt without permission. Because the password is stored in an EEPROM
If the admin password is lost and HP refuses to help, we have to physically reset the BIOS chip. The G6 has a Winbond 25Q80DVNIG (8-pin SPI flash) soldered near the RAM slots.
What you need:
The steps:
Warning: This voids your warranty and can brick the laptop if you flash the wrong region (ME region corruption = no boot). Do not attempt this unless you are an electronics hobbyist. Steps: