Dell M3800 BIOS Recovery

Discussion in 'BIOS Mods' started by WoodburyMan, May 1, 2018.

  1. tqhoang

    tqhoang MDL BIOS Modder

    Apr 29, 2008
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    Have you tried to temporarily disconnect the CMOS battery?

    https://forums.mydigitallife.net/threads/dell-m3800-bios-recovery.77002/#post-1433050
     
  2. emailtoarv

    emailtoarv MDL Novice

    Mar 7, 2019
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    Thanks
    Yes I tried that,
    - Removed the cmos battery for 1 hour, follow the process (pressed power button to remove residual current)

    Restart laptop with different version,
    Tried A7, A10, A11,
    But only for the A12 version Dell logo came and it start installation but
    after step "Writing NVRAM block"
    laptop just stop with power button still blinking, left it for hours but it didn't come back.
    Retried few times, didn't work. May be I need A00 version of bios?
     
  3. abc_253_39

    abc_253_39 MDL Novice

    Mar 13, 2019
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    I follow this, too. And nothing happend :(.
    My USB blicking some times and still light (not blinking) and nothing happend :( black screen still display.
    When I diassembly my M3800 and I find something with VAUB0... tag.
    How can you get ZAU50A?
     
  4. emailtoarv

    emailtoarv MDL Novice

    Mar 7, 2019
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    Try yo use VAUB0 instead of ZAU50, in my machine motherboard tag is ZAU50
     
  5. abc_253_39

    abc_253_39 MDL Novice

    Mar 13, 2019
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    After clear CMOS by removing CMOS battery and repeat following step, my USB drive doesn't blinking after plug AC with END button pressed :(
     
  6. abc_253_39

    abc_253_39 MDL Novice

    Mar 13, 2019
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    I did, but unsucessfully
     
  7. abc_253_39

    abc_253_39 MDL Novice

    Mar 13, 2019
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    Please help me :(
     
  8. LatinMcG

    LatinMcG Bios Borker

    Feb 27, 2011
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    get ch341a programmer..
     
  9. emailtoarv

    emailtoarv MDL Novice

    Mar 7, 2019
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    Tried it with A00 version (by removing the cmos battery), but system is not installing this version.
    Still it recognise the A12 version only.
    Please advice?
     
  10. emailtoarv

    emailtoarv MDL Novice

    Mar 7, 2019
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    Let us know if it worked for you, if anyone tried, thanks?
     
  11. emailtoarv

    emailtoarv MDL Novice

    Mar 7, 2019
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    Tries CH341a programmer rewrite the bios version 00. But still same. any other suggestion please before I order new motherboard?
     
  12. LatinMcG

    LatinMcG Bios Borker

    Feb 27, 2011
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    made backup of original before writing some random ??