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.
If the software methods fail, the definitive hardware solution involves directly programming the BIOS chips. This method has been documented by users and technicians on forums like Badcaps.net for the 840 G6.
HP will generate and email you an SMC.bin file tailored to your machine, alongside specific instructions, notes the MDL Forum . hp elitebook 840 g6 bios password reset work
A highly advanced method involving disassembling the laptop, desoldering the BIOS chip, and using an external programmer (e.g., TL866II) to flash a "clean" BIOS file. This is generally performed only by repair professionals. Potential Workarounds HP Business PCs - Forgotten or lost BIOS password
: The BIOS chip is physically removed from the motherboard or connected via a clip, its data is read into a PC, and a utility like RC Unlocker is used to "patch" the file to remove the password before writing it back to the chip. 4. HP Support (Motherboard Replacement) I tested shorting the RTC_RST pads (near the
, merely removing the CMOS battery is rarely enough to remove a BIOS password , as they are stored in non-volatile flash memory (NVRAM). However, it can sometimes reset system settings. Unplug the laptop and remove the bottom base cover. (crucial for safety). Locate the small, coin-cell CMOS battery.
If you need help identifying the right tools or finding software patches, let me know: If the software methods fail, the definitive hardware
The cleanest, safest, and official way to clear a forgotten BIOS password on a G6 EliteBook is by requesting a file directly from HP. Prerequisites
Remember, the HP community forums are a valuable resource, but you'll find that official HP support will likely direct you to a paid motherboard replacement. Proceed with the above methods at your own risk, and if you are ever unsure, seeking professional data recovery or motherboard repair services is the safest course of action.