Bios unlock assistance request with Asus Vivobook Y4200D

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • mike-s
    New Member
    • Jun 2016
    • 8
    • Australia

    #1

    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.
  • volinakis
    Badcaps Legend
    • Jan 2021
    • 2818
    • N/A

    #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.
    ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
    https://www.badcaps.net/donate/
    ----------------------------------------------------------------------------------------------------------------------------------------------------------------------

    Comment

    • mike-s
      New Member
      • Jun 2016
      • 8
      • Australia

      #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.
    • mike-s
      New Member
      • Jun 2016
      • 8
      • Australia

      #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.

      Comment

      Related Topics

      Collapse

      • zenius
        [REQUEST] Dell G3 3579 BIOS Password & AMI Protected Range/BIOS Guard Unlock
        by zenius
        Hello, I have an old Dell G3 3579 (ST: 2WQ7LP2-8FC8) with a newer 8FC8 BIOS password. I have successfully attached to the flash chip (W25Q128JVSQ) on the motherboard with a CH341A programmer and made several modifications using Intel FIT (e.g., allow software SPI write) without bricking. I was also able to boot to a modified GRUB shell where I attempted to edit many BIOS security related options like BIOS Guard/Lock, Flash Signature Override, ME FW Image Re-Flash, etc.

        Unfortunately, some of these modifications like to Intel BIOS Guard failed because it is fused into the PCH. Also,...
        12-08-2024, 06:13 AM
      • electrono
        Bios unlock for Asus Vivobook X513EA
        by electrono
        Hello everyone,

        The situation is as follows:
        I set a supervisor password for my bios and forgot it because my laptop boots directly into Windows. So apparently there is no need to remember the password, my brain thought, so here I am

        System Specs:
        • Operating System: Windows 11 Pro 64-bit (10.0, Build 26100) (26100.ge_release.240331-1435) (Updated from original Windows 11 Home to 11 Pro using a key)
        • System Manufacturer: ASUSTeK COMPUTER INC.
        • System Model: VivoBook_ASUSLaptop X513EA_K513EA
        • BIOS: X513EA.310 (Type: UEFI)
        • Processor: 11th generation Intel(R)
        ...
        01-11-2025, 02:59 PM
      • macabook
        🛠️ MSI GP75 Leopard MS-17E71 – No Display, Deep BIOS/EC Troubleshooting
        by macabook
        Hello everyone,

        I’m currently working on a dead MSI GP75 Leopard (MS-17E71) motherboard (i7 CPU, NVIDIA GPU) with a no display/no backlight issue initially. After extensive investigation, I’m at a critical stage involving EC firmware, BIOS/ME region interaction, and possible deep corruption. I'm seeking advanced insight from anyone with experience in EC/BIOS sync issues or PCH-level behavior. Here’s a full breakdown:
        đź§© Initial Issue
        • Board powers on (fans spin, keyboard lights up and can be adjusted, caps lock led lights), but no display or backlight
        • External display (HDMI) shows
        ...
        07-24-2025, 02:17 PM
      • greelidd
        K6604J Vivobook RTX 4070 BIOS Dump Request
        by greelidd
        Hi all! Tldr: need a bios dump (.bin format) for K6604J (rtx 4070 and i9-13980hx)

        Longer story: my vivobook stopped booting after i switched out the thermal paste. I think the BIOS got corrupted. Everything i tried didn’t work until finally i decided to buy a CH341A BIOS programmer and just send over the BIOS directly from another PC onto the BIOS chip. I connected fine and backed up the existing BIOS, but i can’t find a clean BIOS that’s a .bin format. And I tried using UEFI software to extract all the files from the ASUS BIOS .exe file and get to the .bin but it was a .302...
        09-01-2025, 06:14 PM
      • BlackVisor
        How to Decode BIOS password for RedmiBook Pro15 2022 6800H
        by BlackVisor
        RedmiBook Pro 1542022 6800H
        SKU: TM2113-39463
        Model Number: RMA2204-AB
        CMIIT ID: 2022AP1835
        SN: 39463/22WD01355
        BIOS version: RMARB5B0P1010 20230628

        1. I bought this laptop from flea market, and the seller said that he had never set a password, however here is a password required when pressing F2 to enter BIOS.
        2. And after entering incorrrect password 3 times, there is no any useful information like "recovery code"
        3. I used universal bios backup tool, and dumped 8MB bin file, but hex code after "SystemSupervisorPw" is...
        01-14-2024, 06:35 AM
      • Loading...
      • No more items.
      Working...