Historically, HP Support could provide a specialized SMC.bin file for a USB drive to clear passwords, but they have largely phased this out for newer "G" series models in favor of motherboard replacements . 4. Official HP Stance
If you are an IT admin, buy a CH341A programmer and learn to use flashrom . If you are an end user, return the laptop to your IT department. There is no free lunch with Intel 8th-gen security. hp elitebook 840 g6 bios password reset work