Lenovo Thinkpad T400 BIOS backup recovery.

Discussion in 'BIOS Mods' started by Czab, Nov 21, 2021.

  1. Czab

    Czab MDL Novice

    Nov 21, 2021
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    Hello.

    I need to downgrade my Lenovo Thinkpad T400 BIOS to an older version. I have a ".BAK" file created by Winphlash. But when I try to use Winphlash to flash my BIOS I get an error message "-104 BIOS image checksum verification failed". How do I flash my BIOS from a ".BAK" file? Is the file corrupt? If so does anyone know where can I find BIOS version 2.02 (7UET56WW)?

    Regards
    Juha
     
  2. Czab

    Czab MDL Novice

    Nov 21, 2021
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    @Asparagus Lover
    Thank you. I might try this next. But I would like to know why this error occurs. Is there something wrong with the file? I don't want to flash a corrupt file if it makes my laptop unusable
     
  3. Asparagus Lover

    Asparagus Lover MDL Junior Member

    May 17, 2019
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    I cannot know for sure why this is happening in your particular case.
     
  4. Czab

    Czab MDL Novice

    Nov 21, 2021
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    It didn't work since my system is 32-bit and that Winphlash version is for 64-bit.
     
  5. Asparagus Lover

    Asparagus Lover MDL Junior Member

    May 17, 2019
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    In the folder there are two versions of WinPhlash: x32 and x64.:)
     
  6. Czab

    Czab MDL Novice

    Nov 21, 2021
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    @Asparagus Lover
    Oh! So there is :). I used the x32 version now and it worked beautifully! Thank you!