HP ProBook 430 G4, 440 G4 - MPM unlock

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  • Rainbow
    Badcaps Legend
    • Aug 2005
    • 1372
    #1

    HP ProBook 430 G4, 440 G4 - MPM unlock

    Got a dead ProBook 430 G4. Unfortunately the CPU was dead (shorted) so I replaced the board. To edit DMI data, MPM has to be unlocked. But the "new" board was used and thus locked.
    None of the methods found online worked. This method works:
    1. Dump the BIOSes from both boards.
    2. Extract NVRAM (Intel image -> BIOS region -> EfiSystemNvDataFvGuid) from the original board BIOS (e.g. using UEFITool).
    3. Replace NVRAM in the new board BIOS with file from (2).
    4. Use hex editor to edit HpMpm NVRAM variable - set the bytes to 01 22 00 00 00 00 00 00 (01 = enabled, 0x22 = remaining boot count until autolock).
    5. Boot the new board with this modified BIOS. MPM is now unlocked and all DMI data preserved. Change board serial number using wndmifit. Reset BIOS settings to factory default and also reset security.
    6. Update the BIOS and ME firmware.
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