I can no longer access the bios as an admin

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  • Gamerfreak_LP
    New Member
    • Oct 2024
    • 2
    • Germany
    #1

    I can no longer access the bios as an admin

    Hello first,
    I have a problem. I can no longer log into my bios as an administrator. I had created a user account in the bios so that I can start the PC normally and an admin account to manage the bios. Without admin access it is not possible to change the boot sequence or the like. This was actually intended as security in case the laptop was stolen or I lost it so that nobody could access the data. I had saved the password on a YubiKey 5c. This normally just entered the password bluntly when I pressed the button.
    But now the mainboard tells me that this password is wrong.
    Do you have any idea what I could do? I once read that only the mainboard can be replaced.

    It is the following laptop:
    Yoga Slim 7 ProX 14ARH7 - Type 82TL
    Serial number: PF408JFL
    BIOS version: JVCN40WW
    Processor: AMD Ryzen 7 6800HS Creator Edition
    Memory: 1 TB
    INSTALLED RAM: 16 GB
    Last edited by Gamerfreak_LP; 10-02-2024, 02:01 PM.
    Tags: None
    • rogfanther
      Badcaps Veteran
      • Jul 2006
      • 458
      • Brazil
      #2
      You will need, probably, to read the content of the bios chip with a spi programmer, then remove it and flash it back. For that, you will need to disassemble the notebook, and ( preferrably ) unsolder the bios chip to read its contents.

      The most common spi programmer is the CH341a. Search here on the forum to read a little more about it, and decide if you want to to try it.

        Comment

        • Gamerfreak_LP
          New Member
          • Oct 2024
          • 2
          • Germany
          #3
          I found the Bios chip for sale on Ebay. However, the description said that the Bios Chip cannot remove a set password. So it wouldn't make much sense to read out the bios, would it? Could it be that the Bios is secured somewhere else?

          Link to the ad: https://www.ebay.com/itm/386784659750​

            Comment

            • reformatt
              Badcaps Legend
              • Feb 2020
              • 1549
              • Australia
              #4
              IIRC, Lenovo moved the admin password from the BIOS to the EC on most of their newer models, not sure about Yoga 7 though. Lenovo's typically use MEC EC's, so they have to be erased and firmware rewritten if my memory serves. This is not something the lay person can do, you need to be able to solder to the board for JTAG and use a special programmer.

              Review this thread:

              https://www.badcaps.net/forum/troubl...ssword-removal

              Lenovo will only ever give you the option of swapping out the board to fix this BTW.

                Comment

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