hp_bios_passwd_erase: just some GPLed C code.

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  • libv
    New Member
    • Apr 2023
    • 3
    • Germany
    #1

    hp_bios_passwd_erase: just some GPLed C code.

    Available at https://github.com/libv/hp_bios_passwd_erase

    Supports $VSS/BiosUser, UserCred and NvramActiveRegn style BIOS. I have tried to be a slight bit more intelligent about handling UserCred, but i am just as crude with NvramActiveRegn as the other tools out there.

    So far, it was verified with images for: Elitebooks 4520s, 8440p, 8460p, 8470p, 840-g1, 840-g2, 840-g3, 840-g4, 840-g5, Probook 650-g3 and 650-g4. I needed this myself for both an 840-g2 and 650-g3.

    Please provide patches or bug reports on github, i will happily read about success stories with previously unverified machines here on badcaps!
    Tags: None
    • peter99
      Member
      • Mar 2025
      • 30
      • kenya
      #2
      Originally posted by libv
      Available at https://github.com/libv/hp_bios_passwd_erase

      Supports $VSS/BiosUser, UserCred and NvramActiveRegn style BIOS. I have tried to be a slight bit more intelligent about handling UserCred, but i am just as crude with NvramActiveRegn as the other tools out there.

      So far, it was verified with images for: Elitebooks 4520s, 8440p, 8460p, 8470p, 840-g1, 840-g2, 840-g3, 840-g4, 840-g5, Probook 650-g3 and 650-g4. I needed this myself for both an 840-g2 and 650-g3.

      Please provide patches or bug reports on github, i will happily read about success stories with previously unverified machines here on badcaps!
      how to user ?
      boot uefi ?

        Comment

        • libv
          New Member
          • Apr 2023
          • 3
          • Germany
          #3
          It has a simple Makefile, so running make should suffice to build it.

          It uses standard C headers, so anything with a libc should theoretically work. That being said, it was only tested on debian with gcc/glibc, but mingw32/64 should be trivially usable as well.

          Its command line looks like:
          $ ./hp_erase --help
          Usage: ./hp_erase <infile> <outfile>

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