If the method above doesn't work, another approach is to use a master password.
. Standard tricks like removing the CMOS (RTC) battery will not work and may even complicate the recovery process by desyncing the system clock. Official Methods for BIOS Password Recovery How To Reset Bios Password Hp Elitebook 840 G3
You provide HP with your laptop’s Serial Number and UUID. They send a file that you place on a FAT32-formatted USB drive. You then boot the laptop while holding Windows + Up Arrow + Down Arrow . If the method above doesn't work, another approach