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DELL Latitude 14 Rugged Extreme 7404

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    #1

    DELL Latitude 14 Rugged Extreme 7404

    Got a few dead 7404s.
    They all died roughly 24hrs after updating to A17.
    Took one apart, removed the two flash chips and read them.
    I also binwalked the Dell EXE update file for A17 and found the exact same binary blobs inside it as my dumped bins. I just have no idea how to re-assemble to a good file. Maybe there are some instructions on the forums that I haven't found yet.

    If I can manage to find a working one, can I just do the same and overwrite the "bad" versions? ... or perhaps somebody has a known good bios dump...

    ME-clean might me something I want to try.
    Last edited by micor; 12-22-2020, 02:15 PM. Reason: Discovered ME cleaning.
    Tags: None
    #2
    Re: DELL Latitude 14 Rugged Extreme 7404

    Post your corrupt bios backups. Name them so you know which one is from each laptop.
    All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

    Comment

      #3
      Re: DELL Latitude 14 Rugged Extreme 7404

      Cannot post them as they seem to contain company internal FQDNs.
      Managed to load them up in Flash Image Tool 9.5.x after concatinating the two files together.
      Will post more another day.

      Thank you!

      Comment

        #4
        Re: DELL Latitude 14 Rugged Extreme 7404

        No problem .
        All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

        Comment

          #5
          Re: DELL Latitude 14 Rugged Extreme 7404

          Ok, so I managed to get one of the 7404s working. The procedure should be exactly the same on the others.
          I put the steps on here. It might help somebody.
          I haven't tested the laptop a lot yet but it's currently installing Ubuntu Studio 20.10 and so far so good.

          -----------------
          - Downloaded Dell Bios A16 for 7404 (It worked fine on A16 before upgrading to A17)
          - Extracted data from A16 using Dell_PFS_Extract.py ( https://github.com/vuquangtrong/Dell-PFS-BIOS-Assembler )

          - De-soldered the flash chips
          - Read flash using a CH341A ( flashrom -p ch341a_spi -r 4/8mb.rom )
          - Merged the two flash dumps ( cat 8mb.rom 4mb.rom > merged.rom )
          - Checked version of merged.rom (ME Analyzer)
          - Got correct version of Intel Flash Image Tool (9.5.x in my case)
          - Loaded merged.rom in Flash Image Tool
          - Pointed the BIOS Region binary to the System Bios file from the A16_extracted directory
          - Built the flash image(s)
          - From the Build directory of Flash Image Tool program the flash chips using the CH341A ( flashrom -p ch341a_spi -w outimage(1/2).bin )
          - Re-soldered the flash chips.

          Thanks to SMDFlea.

          Comment

            #6
            DELL LATITUDE 14 RUGGED EXTREME 7404
            CORE_COMBO_B REV 2.2
            EC_4MB & MAIN_8MB

            Comment

            • peste
              #6.1
              peste commented
              05-19-2025, 01:24 AM
              Editing a comment
              post merged..next time look for a thread with the name and model, motherboard model of the laptop, and post there, if you can't find it, then make a new thread..
            #7
            post S/T full name and model, motherboard model,etc.


            post the contents of the bios chip even if it is corrupted..


            read the forum rules..
            https://www.badcaps.net/forum/troubl...ore-posting
            Due to a lack of donations, server free space at a critical level, and possible closure of Bios Requests all donations are welcome, click:

            >>>>> https://www.badcaps.net/index.php?pageid=donate1 <<<<<

            Every donation made will go towards server fees and maintenance costs.

            Comment

              #8
              motherboard model CORE_COMBO_B REV 2.2

              Attached Files

              Comment

              • peste
                #8.1
                peste commented
                05-21-2025, 01:12 AM
                Editing a comment
                and the ST????
              #9
              That's all the motherboard information.

              PPID:TW0GCCWP75085473006JA03
              BIOS :A08
              74852A211100

              Comment

                #10
                Originally posted by majid1122 View Post
                That's all the motherboard information.

                PPID:TW0GCCWP75085473006JA03
                BIOS :A08
                74852A211100
                S/T (service tag) is written on a label on the laptop case...
                Due to a lack of donations, server free space at a critical level, and possible closure of Bios Requests all donations are welcome, click:

                >>>>> https://www.badcaps.net/index.php?pageid=donate1 <<<<<

                Every donation made will go towards server fees and maintenance costs.

                Comment

                  #11
                  The information on the case has been erased.

                  Can the file be repaired without S/T?

                  Comment

                    #12
                    i'm still waiting for the file to be repaird for me, would you please repair the file for me

                    Comment

                      #13
                      Originally posted by majid1122 View Post
                      i'm still waiting for the file to be repaird for me, would you please repair the file for me
                      Service Tag: JMZKNY1
                      try
                      Attached Files

                      Comment

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