ASUS PRIME B550M-A AC weird behavior

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  • RotVik
    Learning...
    • Feb 2016
    • 53
    • Mexico
    #1

    ASUS PRIME B550M-A AC weird behavior

    Hello, I need a little help

    I got an ASUS PRIME B550M-A AC Motherboard, bad BIOS, it wont display or boot, unless I did CMOS Restart first, after that It will boot but if I modified the configuration of the bios and saved it ,again no image

    I got the BIOS .CAP file from ASUS official support, used a tool called ASUS CAP to BIN, and programmed it to the IC, soldered to the board and got it to boot correctly, all the way to Windows, but now the CPU fan stays at full speed all the time and if I try to power it off with power button it will restart instead, and there are probably more issues I have not seen.

    Any help will be appreciated

    Original dump attached

    Thank you in advance, cheers!

    post moved...
    Attached Files
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    • Answer selected by RotVik at 05-09-2025, 10:03 AM.
      peste
      Super Moderator
      • Dec 2016
      • 12314
      • ROMANIA
      Originally posted by RotVik

      Thank you your answer and you are right, I uploaded it wrong, here is the correct one I hope 32,768KB

      Cheers!
      try..
      Attached Files
        • Selected Answer

        Comment

        • peste
          Super Moderator
          • Dec 2016
          • 12314
          • ROMANIA
          #2
          Originally posted by RotVik
          Hello, I need a little help

          I got an ASUS PRIME B550M-A AC Motherboard, bad BIOS, it wont display or boot, unless I did CMOS Restart first, after that It will boot but if I modified the configuration of the bios and saved it ,again no image

          I got the BIOS .CAP file from ASUS official support, used a tool called ASUS CAP to BIN, and programmed it to the IC, soldered to the board and got it to boot correctly, all the way to Windows, but now the CPU fan stays at full speed all the time and if I try to power it off with power button it will restart instead, and there are probably more issues I have not seen.

          Any help will be appreciated

          Original dump attached

          Thank you in advance, cheers!

          post moved...
          the bios posted is longer...copy and post again...

          The bios chip must be unsoldered from the board before writing or reading..
          do not use the clip, you may have errors..if you do not have anything to unsolder it with,
          solder wires between the programmer and the bios chip..​
          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

            • RotVik
              Learning...
              • Feb 2016
              • 53
              • Mexico
              #3
              Originally posted by peste

              the bios posted is longer...copy and post again...

              The bios chip must be unsoldered from the board before writing or reading..
              do not use the clip, you may have errors..if you do not have anything to unsolder it with,
              solder wires between the programmer and the bios chip..​
              Thank you your answer and you are right, I uploaded it wrong, here is the correct one I hope 32,768KB

              Cheers!
              Attached Files

                Comment

                • peste
                  Super Moderator
                  • Dec 2016
                  • 12314
                  • ROMANIA
                  #4
                  Originally posted by RotVik

                  Thank you your answer and you are right, I uploaded it wrong, here is the correct one I hope 32,768KB

                  Cheers!
                  try..
                  Attached Files
                  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.
                    • Selected Answer

                    Comment

                    • RotVik
                      Learning...
                      • Feb 2016
                      • 53
                      • Mexico
                      #5
                      Originally posted by peste

                      try..
                      Hello!, I can confirm that this BIOS is working, CPU Fan and QFan control are responding and not at full speed all the time anymore, also powering off is working correctly, will continue testing all the way to Windows and report if necessary.

                      Thank you very much for your help!

                        Comment

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