Previously, HP Support could email a unique SMC.bin file to clear the password. As of recent years, HP has largely stopped providing these files for free and instead recommends a motherboard replacement.
: Note that HP has significantly restricted this for newer "G" generation laptops. However, it is still the first recommended step for legitimate owners. 2. Using HP SpareKey (If Previously Set Up) hp zbook 15 g5 bios password reset free