Lenovo Thinkpad T480 BIOS and EEPROM request

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  • Xargon1975
    Member
    • Apr 2025
    • 13
    • España

    #141
    Hi, I've been trying to unlock my T480's BIOS for over two weeks now.
    I followed all the instructions, tried AutoPatcher and other BIOS versions, but no luck.
    I found out that if the CRC check is wrong, the laptop plays a beep and shows a black screen. I fixed that issue, but now I'm stuck at a stage where the laptop just shuts down.
    If I restore the original BIOS, it asks for the password again and stays locked. What can I do???

    Type: 20L6-SDR213
    Serial No: PF-14H8HB
    Bios N24ET77W (1.52 )

    Attached Files

    Comment

    • hoaca388
      Badcaps
      • Jan 2022
      • 11164
      • Viet Nam

      #142
      Originally posted by Xargon1975
      Hi, I've been trying to unlock my T480's BIOS for over two weeks now.
      I followed all the instructions, tried AutoPatcher and other BIOS versions, but no luck.
      I found out that if the CRC check is wrong, the laptop plays a beep and shows a black screen. I fixed that issue, but now I'm stuck at a stage where the laptop just shuts down.
      If I restore the original BIOS, it asks for the password again and stays locked. What can I do???

      Type: 20L6-SDR213
      Serial No: PF-14H8HB
      Bios N24ET77W (1.52 )
      Try agian with AutoPatcher.
      Attached Files


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      Comment

      • Xargon1975
        Member
        • Apr 2025
        • 13
        • España

        #143
        Originally posted by hoaca388

        Try agian with AutoPatcher.
        Thank you for your response and for your assistance.
        I attempted to patch the file you provided, but the issue persists.
        The system plays the startup melody followed by a blank screen (no display output).
        When I revert to the original file you shared, the device boots successfully, but the BIOS remains locked.
        Attached Files

        Comment

        • khrapr
          khrapr
          • Apr 2025
          • 2
          • Indonesia

          #144
          Please need help to remove supervisor password, I've been tried run Lenovo auto patcher and its doesn't work, after power on my laptop "sings" or melody after few second and no picture.
          Type T480 20L5-20L6
          S/N PF1GR4NL
          Bios Version : N24ET79W 1.54

          Thank's for your help.​

          Comment

          • eKuliscool
            New Member
            • May 2025
            • 1
            • Germany

            #145
            Hello guys I really need your support because i tried to modify my bios and flashed it and after that nothing worked anymore...
            My Thinkpad T480 doesnt turn on anymore and there are no lights, fan spinning etc... - so basically dead. The only thing working is when i plug it via AC then it charges.
            I flashed the bios Chip with a lot of other verions provided in this post and nothing helped unfortunalty.
            My Setup is the following:
            Lenovo Thinkpad T480
            Type: 20L6-S29E0C
            S/N: PP-1QC3TB
            Mainboard: i can"t tell you the exact Mainboard because i couldnt find any information about it on itself but i guess its ET480 NM-B501 as usual because i havent seen any other serial number for it.
            I would really appreciate the help because i really despair at this task.
            So if someone could help me and also need some more information i would love to provide them.
            (If its possible to give me an bios with a patched version (advanced menu, overclocking and erasing wwan whitelist) it would be even more perfect but not needed )
            I have no back up bios - because mine was broke and the only thing that matter is that my T480 will work again.
            Best regards and Thanks

            Comment

            • anirash25
              New Member
              • Nov 2013
              • 8
              • India

              #146
              Please help Clear the Bios Password Lenovo T480
              MB Part No: NM-B501
              Laptop Serial No : PF-1K59S7
              Attached Files

              Comment

            • ali0robot
              Senior Member
              • Mar 2023
              • 58
              • N/A

              #147
              Originally posted by anirash25
              Please help Clear the Bios Password Lenovo T480
              MB Part No: NM-B501
              Laptop Serial No : PF-1K59S7
              try
              Attached Files

              Comment

              • ali0robot
                Senior Member
                • Mar 2023
                • 58
                • N/A

                #148
                Originally posted by eKuliscool
                Hello guys I really need your support because i tried to modify my bios and flashed it and after that nothing worked anymore...
                My Thinkpad T480 doesnt turn on anymore and there are no lights, fan spinning etc... - so basically dead. The only thing working is when i plug it via AC then it charges.
                I flashed the bios Chip with a lot of other verions provided in this post and nothing helped unfortunalty.
                My Setup is the following:
                Lenovo Thinkpad T480
                Type: 20L6-S29E0C
                S/N: PP-1QC3TB
                Mainboard: i can"t tell you the exact Mainboard because i couldnt find any information about it on itself but i guess its ET480 NM-B501 as usual because i havent seen any other serial number for it.
                I would really appreciate the help because i really despair at this task.
                So if someone could help me and also need some more information i would love to provide them.
                (If its possible to give me an bios with a patched version (advanced menu, overclocking and erasing wwan whitelist) it would be even more perfect but not needed )
                I have no back up bios - because mine was broke and the only thing that matter is that my T480 will work again.
                Best regards and Thanks
                if you have 3.3 on bios chip look for resistance around bios chip, sometime one of those resistance are misplace or lost. in most cases they are 33 or 50 ohm

                Comment

                • OrcunerenGungen
                  New Member
                  • Jul 2021
                  • 6
                  • kmlklkm

                  #149
                  Hello I have a t480 with supervisor password. I dumped the bios and patched it with the patcher on this forum. I got verification errors at first but after using another software to write with ch341a I was able to write and verify. But laptops power button blinks 3 times and nothing happens even with original bios. Can anyone take a look at my dump? I also tried other dumps from sit e but same thing. Also I noticed a resistor and 2 caps missing I bridged the resistor and left the caps as is Any Help is Much Appreciated. The resistor is r694 and it is 33 ohm and 2 missing 33p caps c576 and c577 There is 1.6v at vcc of bios and 3.3v at cs
                  Attached Files

                  Comment

                  • SMDFlea
                    Super Moderator
                    • Jan 2018
                    • 20300
                    • UK

                    #150
                    Originally posted by OrcunerenGungen
                    Hello I have a t480 with supervisor password. I dumped the bios and patched it with the patcher on this forum. I got verification errors at first but after using another software to write with ch341a I was able to write and verify. But laptops power button blinks 3 times and nothing happens even with original bios. Can anyone take a look at my dump? I also tried other dumps from sit e but same thing. Also I noticed a resistor and 2 caps missing I bridged the resistor and left the caps as is Any Help is Much Appreciated. The resistor is r694 and it is 33 ohm and 2 missing 33p caps c576 and c577 There is 1.6v at vcc of bios and 3.3v at cs
                    Type the laptop serial number, full name and model, motherboard model, etc.

                    read the forum rules..https://www.badcaps.net/forum/troubl...before-posting

                    All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                    Comment

                    • OrcunerenGungen
                      New Member
                      • Jul 2021
                      • 6
                      • kmlklkm

                      #151
                      SN:PF1AQ6LW Model:20L6S0AF00 cant find mobo model

                      Comment

                      • OrcunerenGungen
                        New Member
                        • Jul 2021
                        • 6
                        • kmlklkm

                        #152
                        I couldnt edit my post The 3.3v comes to CS after plugging adapter doesnt come with battery

                        Comment

                        • SMDFlea
                          Super Moderator
                          • Jan 2018
                          • 20300
                          • UK

                          #153
                          Originally posted by OrcunerenGungen
                          I couldnt edit my post The 3.3v comes to CS after plugging adapter doesnt come with battery
                          Replace the caps and resistors then it might just work properly.
                          All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                          Comment

                          • OrcunerenGungen
                            New Member
                            • Jul 2021
                            • 6
                            • kmlklkm

                            #154
                            I fixed the issue it was the d12 diode on the back I put a wire for now I hope it helps someone else Also you can put a wire instead of 33 ohm resistors no problem but putting a new diode is recommended

                            Comment

                            • Luis Martin
                              New Member
                              • Jun 2025
                              • 5
                              • United States

                              #155
                              Lenovo T480 bricked during a firmware update on ubuntu system, light on power button and fan turn on, no screen or HDMI output. Bip bip sound when turn on without RAM.

                              Brand: Lenovo T480
                              board No: Et480 nm-b501 (2018)
                              s/n: Pf-1EQ53J 18/09
                              Type: 20L5-000WUS
                              processor type: i5
                              issue: bricked during a firmware update
                              requesting: working BIOS.

                              The 3 attached files are the same DUMP with 3 different chips names for redundancy.
                              Attached Files

                              Comment

                              • SMDFlea
                                Super Moderator
                                • Jan 2018
                                • 20300
                                • UK

                                #156
                                Originally posted by Luis Martin
                                Lenovo T480 bricked during a firmware update on ubuntu system, light on power button and fan turn on, no screen or HDMI output. Bip bip sound when turn on without RAM.

                                Brand: Lenovo T480
                                board No: Et480 nm-b501 (2018)
                                s/n: Pf-1EQ53J 18/09
                                Type: 20L5-000WUS
                                processor type: i5
                                issue: bricked during a firmware update
                                requesting: working BIOS.

                                The 3 attached files are the same DUMP with 3 different chips names for redundancy.
                                try this one.
                                Attached Files
                                All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                                Comment

                                • Luis Martin
                                  New Member
                                  • Jun 2025
                                  • 5
                                  • United States

                                  #157
                                  Originally posted by SMDFlea

                                  try this one.
                                  Thank you SMDFlea.

                                  Unfortunately doesn't work.

                                  Comment

                                  • SMDFlea
                                    Super Moderator
                                    • Jan 2018
                                    • 20300
                                    • UK

                                    #158
                                    Originally posted by Luis Martin

                                    Thank you SMDFlea.

                                    Unfortunately doesn't work.
                                    Did you get the update from LVFS https://fwupd.org/ ,was the EC updated as well.
                                    All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                                    Comment

                                    • Luis Martin
                                      New Member
                                      • Jun 2025
                                      • 5
                                      • United States

                                      #159
                                      Originally posted by SMDFlea

                                      Did you get the update from LVFS https://fwupd.org/ ,was the EC updated as well.
                                      To be honest idk, i just get a update firmware pop-up and click on it.

                                      I find this .bin on another forum and I flash it, and it works now i got Lenovo screen and i can go to bios but .... now if i plug a hdd/ssd the system just start blinking the screen in black.
                                      If I remove ssd the system boot from my usb to install operating system but I can't because no ssd installed​. 🤔

                                      Comment

                                      • Luis Martin
                                        New Member
                                        • Jun 2025
                                        • 5
                                        • United States

                                        #160
                                        Originally posted by Luis Martin

                                        To be honest idk, i just get a update firmware pop-up and click on it.

                                        I find this .bin on another forum and I flash it, and it works now i got Lenovo screen and i can go to bios but .... now if i plug a hdd/ssd the system just start blinking the screen in black.
                                        If I remove ssd the system boot from my usb to install operating system but I can't because no ssd installed​. 🤔
                                        this bios
                                        Attached Files

                                        Comment

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