For an HP ZBook 15 G5, standard "free" tricks like removing the CMOS battery or using universal master passwords generally do not work because the password is stored in non-volatile memory

The Process: You provide your serial number and UUID to HP. They send you a file to place on a USB drive. You boot the laptop with the drive inserted, which clears the password.

Unlock: Visit a free generator like bios-pw.org or biospog.com and enter the code to see if an unlock key is generated.

  1. You've forgotten the password and can't access your computer.
  2. You've acquired a used laptop with a set BIOS password.
  3. The password was set by someone else, and you don't know what it is.

if you cannot prove ownership with an original bill of sale. You can start a request via the HP Support Portal HP Support Community 3. Methods That Generally Do NOT Work CMOS Battery Removal:

Some HP laptops, including the ZBook 15 G5, have a built-in feature to reset the BIOS password using a key combination. Try the following: