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Lenovo g50-70 bios problem

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    #1

    Lenovo g50-70 bios problem

    Hello.
    I recently got this laptop from a friend. It would not boot, but as I did some initial troubleshooting I saw that the screen was coming on and off. So I flashed the bios with rom from this thread:
    https://www.badcaps.net/forum/showthread.php?t=48851
    It now works, but it starts very slowly until the lenovo logo is displayed. I am also unable to update bios to latest version (9acn32ww, current version is 9acn25ww) from lenovo website. It uses Insydeh20 and it always displays firmware update error, I have tried in legacy mode, uefi mode, disable secureboot a.s.o but nothing.
    It also reads in the bios setup that it have no DPK (Digital Product Key), is that lost too or is it because I have installed win 8.1 pro instead of 8 retail?
    I have saved the old corrupt bios image.
    Anybody else had problems like this?
    Tags: None
    #2
    Re: Lenovo g50-70 bios problem

    I have the same issue on some HP, I'm studying the problem and waiting a EC programmer to do some tests.

    Comment

      #3
      Re: Lenovo g50-70 bios problem

      Here is a guide to flash it in DOS mode.
      https://forums.lenovo.com/t5/Welcome...nt/ta-p/278406
      I haven´t tested that yet, but as soon as i get it tested I will report back how it went.

      Comment

        #4
        Re: Lenovo g50-70 bios problem

        Ok, so the DOS thing got me nowhere. I just got the same error message as described in the link.
        So, Next step was to try recovery flash. I used andy´s tool to get the filename, copied it to a formatted usb drive, pulled the battery and ac cord. press fn + r, insert AC and press power. It starts to read from the usb drive, but the reboots and no progress. Is it possible to edit the working dump to match EC (I assume that is the problem, EC and UEFI doesn´t match)?

        Comment

          #5
          Re: Lenovo g50-70 bios problem

          I managed to extract bios binary from .fd file found in lenovo executable (I think)
          The extracted binary is the same size as the dump. Doesn´t that mean that when flashing some data is copied from old bios to new when flashing? Like S/N and SLP key? Otherwise I cannot understand why the working dump from the other thread didn´t work properly.

          So, Next I´m going to try to remove IC, solder in cable with connector that fits an adapter with SOP8 & my programmer and program in working bios. Boot it up to recovery menu, pull IC and program original bios to it and flash new bios from lenovo using flashit (DOS mode). Any thoughts on that?

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            #6
            Re: Lenovo g50-70 bios problem

            Dos mode with fpt or similar software is not the best choice in this situation.
            Desolder the chip, reprogram with bios dump and resolder it , but there are other things , this model has a programmable EC and I think there is a problem regarding his firmware.
            I think it is so slowly because there is a check on some data as serial number inside new bios and the original factoring data stored (I think) in the EC .

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              #7
              Re: Lenovo g50-70 bios problem

              Problem solved!
              I opened up my corrupt bios rom file in UEFI tool, and noticed that there was a part that could not be decompressed. So I replaced that section with a body from working dump. Programmed it and now it works! Serial number is correct, UUID, windows license etc.

              Comment

                #8
                Re: Lenovo g50-70 bios problem

                nice

                Comment

                  #9
                  Re: Lenovo g50-70 bios problem

                  Originally posted by bollin View Post
                  Problem solved!
                  I opened up my corrupt bios rom file in UEFI tool, and noticed that there was a part that could not be decompressed. So I replaced that section with a body from working dump. Programmed it and now it works! Serial number is correct, UUID, windows license etc.
                  hello sir,

                  i have the same problem, and i flash the bios with another file it works great but logo lenovo appear after 20 seconds , i attached here my original backup and the working file, if you can fix my original bios? thank you so much .
                  Attached Files

                  Comment

                    #10
                    Re: Lenovo g50-70 bios problem

                    Sorry, I have been away for a while. Try this!
                    Attached Files

                    Comment

                      #11
                      Re: Lenovo g50-70 bios problem

                      i have same laptop and the issue that it works fine with charger but when i attach the battery it give me (power on and no display).by removing the battery it is fine and normal .so any one have an idea abut this problem .thanks

                      Comment

                        #12
                        Re: Lenovo g50-70 i3 bios problem

                        i have the same problem, and i flash the bios with another file it works great but logo lenovo appear after 20 seconds , i attached here my original backup and the working file, if you can fix my original bios? thank you so much .
                        Attached Files
                        Attached Files
                        Last edited by newarcada_computers@yahoo; 04-15-2019, 05:07 AM.

                        Comment

                          #13
                          Re: Lenovo g50-70 bios problem

                          Problem solved, biso dump no delay logo lenovo
                          Attached Files

                          Comment

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