Lenovo Thinkcentre M75n DMI Data extraction from dumped BIOS

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  • Kentsfield
    New Member
    • May 2025
    • 2
    • Germany
    #1

    Lenovo Thinkcentre M75n DMI Data extraction from dumped BIOS

    Hi,

    I got a Lenovo Thinkcentre M75n (MT-M 11G5 PF3XG5V3) with a semi-bricked bios.

    Short recap: I want to add an external GPU via the M.2 slot (Oculink). It does work but has some problems with the onboard GPU of the Ryzen 3 3300U. So I used Smokeless_UMAF to disable it. Since then I don't get any video via the external GPU nor the iGPU and Can't access the BIOS, but the PC does boot to the OS.

    I desoldered the flash IC MX25U12872F and dumped the flash.

    I also downloaded the newest BIOS and have it as a .bin file (I loosely compared the contents and they seem to match). However, I need to extract the DMI data of my BIOS dump. For that I used Lenovo DMI Decryptor (https://github.com/Shmurkio/LenovoDMIDecryptor) but I get this error:
    LENV.exe "Lenovo_M75n_orig_bios1.bin" -info
    DMI block 1 not found in file "Lenovo_M75n_orig_bios1.bin".

    I can provide the dumped and working BIOS (but without picture) and the new BIOS update as BIN files. They are not the same versions!

    Please help me extract the files. Thank you and kind regards!
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