If software methods fail, the only remaining option is to physically reprogram the BIOS chip on the motherboard. EliteBook 840 G3 BIOS Password - HP Support Community
Resetting the BIOS password on an HP EliteBook 840 G3 is more complex than on older models because it does not use simple master codes and the password is stored in non-volatile memory (EEPROM) . Standard methods like removing the CMOS battery will clear the password on this business-class device. HP Support Community 1. HP SpareKey Recovery If you or a previous administrator set up HP SpareKey --- Hp Elitebook 840 G3 Bios Password Reset Utility
: Place the provided file on a FAT32-formatted USB drive, insert it into the laptop, and hold Windows Key + Up Arrow + Down Arrow while powering on. If software methods fail, the only remaining option
The standard professional method involves contacting HP Support to obtain a customized file tied to your laptop's serial number and UUID. HP Support Community : You must provide proof of ownership to an HP Support Agent Installation HP Support Community 1