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Bios unlock assistance request with Asus Vivobook Y4200D

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    Bios unlock assistance request with Asus Vivobook Y4200D

    Manufacturer: Asustek
    Model: Y4200DA3500-0D8SXFAJX10
    CMITID: 2019AJ2497
    Manufacture date: 2019-11 12M
    Other SN i'm unsure of: 15105-06839000
    There are other serial numbers on the board, but I don't think they really and no the X509DL motherboard doesn't have built in ethernet and I don't believe that it has Bluetooth built in,

    This laptop is locked with the boot bios and I've kind of run out of momentum in trying to figure this out myself. The ctrl-r backup password didn't work and using the manufacture date
    on the sticker and every other code within 5 months either way from te manufacture date didn't work.

    I've been able to pull the bios rom from the chip and have managed to open it with UEFItool, and was able to find the AMITSESetup section within NVRAM. However I was unable to decode
    the password into UTF-8 readable text. using the XOR code mentioned in the posts about decoding it. I also tried the SHA256 decode tools and wasn't able to identify a code in the bios there.
    Though that doesn't mean it isn't there and could well mean that I was doing something incorrectly. I have probably wasted about five hours trying to figure this out once i extracted the bios
    and don't think I'm going to make much progress without assistance.

    Any help would be appreciated, be it clearing the password, telling me what the password or even just pointing out where I could possibly have gone wrong as I don't just want to have it fixed (which would be handy)
    But I also want to understand the process and where I was going wrong with this.
    Thankyou
    Attached Files
    Last edited by mike-s; 12-12-2023, 11:56 AM.

    #2
    your serial is: KBN0CV15N992488
    try this file, password removed - you just have to fill with 00 strings containing password.
    Attached Files
    Last edited by volinakis; 12-12-2023, 01:11 PM.
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    https://www.badcaps.net/donate/
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    Comment


      #3
      Thankyou for that. I'll compare the rom i supplied when I get home with the screenshot from what you've done and see just exactly how I was doing this incorrectly & give your rom a shot..

      Comment


      • volinakis
        volinakis commented
        Editing a comment
        compare your bios dump against modified one, you'll get it faster.

      #4
      I'm sorry, I didn't get around to downloading the rom quickly enough as I've been called into work unexpectedly, three days in a row and couldn't get to it quickly enough.
      edit: that's weird. When I logged in from home, it showed the file as removed, and now at work, it's back.

      I've downloaded it anyway, thankyou..
      Last edited by mike-s; 12-14-2023, 02:36 AM.

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