Flashing a T480s BIOS

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  • CryingInPublic
    New Member
    • Jul 2021
    • 3
    • Canada
    #1

    Flashing a T480s BIOS

    Hello,

    I have some electronics experience, but I haven't flashed a BIOS chip before. If someone doesn't mind answering a few basic questions I would really appreciate it. Which chip on the T480s system board do I need to dump/write to? Also, which programmer should I use (CH431a, TL866II plus, etc.)?

    As far as I can tell, it's either U49 (25Q128JVSQ, SOIC8) or U23 (MEC1663, BGA). If it's U23, do I interface with it using the JTAG connector next to it?

    Thanks in advance!

    P.S. I hope I've put this in the correct sub-forum
    Last edited by CryingInPublic; 07-04-2021, 06:08 PM.
    Tags: None
    • LenBios
      Senior Member
      • Jan 2018
      • 122
      • Ker
      #2
      Re: Flashing a T480s BIOS

      Originally posted by CryingInPublic
      Hello,

      I have some electronics experience, but I haven't flashed a BIOS chip before. If someone doesn't mind answering a few basic questions I would really appreciate it. Which chip on the T480s system board do I need to dump/write to? Also, which programmer should I use (CH431a, TL866II plus, etc.)?

      As far as I can tell, it's either U49 (25Q128JVSQ, SOIC8) or U23 (MEC1663, BGA). If it's U23, do I interface with it using the JTAG connector next to it?

      Thanks in advance!

      P.S. I hope I've put this in the correct sub-forum
      Hi,

      U49 (25Q128JVSQ, SOIC8) is the chip, read the chip 2-3 time compare it and save, use autopatch and follow the instruction..... and write the original Bin back all is done.
      it can be done with CH431a, TL866II plus..
      Last edited by LenBios; 07-05-2021, 12:14 AM.

        Comment

        • CryingInPublic
          New Member
          • Jul 2021
          • 3
          • Canada
          #3
          Re: Flashing a T480s BIOS

          Thanks! I'll get myself a programmer and let you know how it turns out.

            Comment

            • trili
              New Member
              • Dec 2021
              • 9
              • CA
              #4
              Re: Flashing a T480s BIOS

              Originally posted by LenBios
              Hi,

              U49 (25Q128JVSQ, SOIC8) is the chip, read the chip 2-3 time compare it and save, use autopatch and follow the instruction..... and write the original Bin back all is done.
              it can be done with CH431a, TL866II plus..
              Hi, is U49 same for T470s?

                Comment

                • bigsqueaks
                  New Member
                  • Sep 2022
                  • 2
                  • USA
                  #5
                  Re: Flashing a T480s BIOS

                  Found this page while trying to use autopatcher with a t480s. The U49 25Q chip is the one you're looking for. It's located next to the RAM expansion slot, so close that an 8-pin clip has almost no clearance, but it will fit. There are other chips to be confused with so make sure you find the right one.

                  I also wondered if it was working because the screen was blank for a bit longer than I expected, but it did and I'm very happy.

                    Comment

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