Dell Latitude 5431 issues with dumping bios

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  • Sathsul
    New Member
    • Sep 2025
    • 6
    • Polska

    #1

    Dell Latitude 5431 issues with dumping bios

    So, i kinda spend significant ammount of the last couple of days trying to flash a new bios, and or unlocking the current bios password with little to no results.
    The whole thing started with it being the 8fc8 bios, i found the tools to unlock that but i needed a bios dump. So i pursued that, im at a point where i dessoudered the chip, and succesfully soudered it to the ch341, dumped whatever was on it.
    However, the tools supposed to unlock the 8fc8 say that there is no 8fc8 hex inside. And when i followed diffrent tutorials to just flash a new bios onto the chip i got stuck on the step when you need to find the exact line on the new bios that your old bios starts with.
    That prompted me to go down google/forums rabbit hole of searching and trying diffrent things, UEFItool says that this bin may be corrupted, i got lost in tabs i opened in the browser and i relised that in fact i was out of my depth like couple of hours ago.
    it all kind led me to belive that the bios dump that i have is either corupted, im not reading it correctly, both, or neither and i in fact have no idea what im talking about.

    It would be ideal if i could have the opportunity to actually understand the proccess and what and where i did wrong.
    Does anyone have any idea if that dump is in fact correct and intact or am i missing something obvious.

    Laptop Dell Latitude 5431
    service tag DK55WV3
    Laptop was booting before dissasembly with no obvious flaws, other then being blocked by that password.

    Chip is i belive winbond 25r128jvsn

    I was using NEOProgrammer to read the IC, bin in the attachment.

    Clues and help would be appriciated,
    Attached Files

    if you find these attachements useful please consider making a small donation to the site

  • Answer selected by Sathsul at 11-03-2025, 03:39 PM.
    SMDFlea
    Super Moderator
    • Jan 2018
    • 22397
    • UK

    Originally posted by Sathsul
    Clues and help would be appriciated,
    There are 2 bios chips, the code is split across both. The one with the pass is 8MB , go find that chip it`s the one next to the rabbit hole

    Comment

    • SMDFlea
      Super Moderator
      • Jan 2018
      • 22397
      • UK

      #2
      Originally posted by Sathsul
      Clues and help would be appriciated,
      There are 2 bios chips, the code is split across both. The one with the pass is 8MB , go find that chip it`s the one next to the rabbit hole
      All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

      Comment

      • hoaca388
        Badcaps
        • Jan 2022
        • 12490
        • Socialist Republic of Vietnam

        #3
        Originally posted by Sathsul
        So, i kinda spend significant ammount of the last couple of days trying to flash a new bios, and or unlocking the current bios password with little to no results.
        The whole thing started with it being the 8fc8 bios, i found the tools to unlock that but i needed a bios dump. So i pursued that, im at a point where i dessoudered the chip, and succesfully soudered it to the ch341, dumped whatever was on it.
        However, the tools supposed to unlock the 8fc8 say that there is no 8fc8 hex inside. And when i followed diffrent tutorials to just flash a new bios onto the chip i got stuck on the step when you need to find the exact line on the new bios that your old bios starts with.
        That prompted me to go down google/forums rabbit hole of searching and trying diffrent things, UEFItool says that this bin may be corrupted, i got lost in tabs i opened in the browser and i relised that in fact i was out of my depth like couple of hours ago.
        it all kind led me to belive that the bios dump that i have is either corupted, im not reading it correctly, both, or neither and i in fact have no idea what im talking about.

        It would be ideal if i could have the opportunity to actually understand the proccess and what and where i did wrong.
        Does anyone have any idea if that dump is in fact correct and intact or am i missing something obvious.

        Laptop Dell Latitude 5431
        service tag DK55WV3
        Laptop was booting before dissasembly with no obvious flaws, other then being blocked by that password.

        Chip is i belive winbond 25r128jvsn

        I was using NEOProgrammer to read the IC, bin in the attachment.

        Clues and help would be appriciated,
        Yes, there is no 8FC8 hex code in the file you posted, that chip only contains Me region, read the 32MB chip.
        ↵

        Any donations to badcaps are welcome, click this link to donate . Thanks to all the supporters
        ​https://www.badcaps.net/donate

        Comment

        • Sathsul
          New Member
          • Sep 2025
          • 6
          • Polska

          #4
          i have the other "bios looking chip" dessoudered as well, will try that and come back with an update.

          Comment

          • SMDFlea
            Super Moderator
            • Jan 2018
            • 22397
            • UK

            #5
            Originally posted by hoaca388

            Yes, there is no 8FC8 hex code in the file you posted, that chip only contains Me region, read the 32MB chip.
            Is it 32 (ME) + 16 (Region) or 8 + 16 , i didn`t check
            All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

            Comment

            • LBTT1121
              Badcaps Legend
              • Nov 2024
              • 1261
              • Việt Nam

              #6


              16Mb and 32Mb, read 32Mb and used 8FC8 Patch

              Comment

              • Sathsul
                New Member
                • Sep 2025
                • 6
                • Polska

                #7
                Originally posted by SMDFlea

                Is it 32 (ME) + 16 (Region) or 8 + 16 , i didn`t check
                The second chip i have out is 8mb and i can't seem to locate another one on the motherboard that looks the part.
                This one also doesnt contain the 8fc8 hex

                the two spots i circled are where the two chips come from
                Attached Files

                if you find these attachements useful please consider making a small donation to the site

                Comment

                • Sathsul
                  New Member
                  • Sep 2025
                  • 6
                  • Polska

                  #8
                  Unless it's this fella right here
                  Attached Files

                  if you find these attachements useful please consider making a small donation to the site

                  Comment

                  • SMDFlea
                    Super Moderator
                    • Jan 2018
                    • 22397
                    • UK

                    #9
                    Originally posted by Sathsul
                    Unless it's this fella right here
                    All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                    Comment

                    • m1ch43lzm
                      Badcaps Legend
                      • Mar 2019
                      • 1179
                      • Peru

                      #10
                      Originally posted by Sathsul
                      Unless it's this fella right here
                      This looks like it
                      EDIT: Replied too late...

                      Comment

                      • Sathsul
                        New Member
                        • Sep 2025
                        • 6
                        • Polska

                        #11
                        So, i come bearing news.

                        it was in fact there, the 8fc8 patcher did its job. I promptly wiped the chip, flashed the unlocked bios, verified ic integrity, aaaaand it's dead.
                        On the first boot it was spinning the fans top speed and after a minute or so it died, now is not responsive.

                        Now i assume me taking out chips left and right, heating up the bloody thing may or may not have something to do with it being bricked now. Still this was a learning experience and i do feel i learned a lot. Even if i have nothing to show for it.
                        i did try reseating all the chips i vandalised but still shows no signs of life.

                        Comment

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