Lenovo Yoga 2 13 Bios Rom <> EC

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  • webwicht
    New Member
    • Oct 2021
    • 8
    • Germany
    #1

    Lenovo Yoga 2 13 Bios Rom <> EC

    On a Lenovo Yoga 2 13 an older version of the Bios and EC firmware was installed.
    When reading out the Bios Rom with a bad CH341-HW-Flasher I damaged the Rom:
    Lenovo was brick dead.

    Now I found a backup copy of the Bios-Rom 1.17 for this computer on my hard drive,
    which I created times ago with the Insyde H2OFFT-tool. (I have to say that I downgraded Bios in the hope that it would accept another wifi card)

    After installing a new bios Rom which I flashed with the backup I could switch on the laptop, keyboard lights turn on and fan briefly spins up but screen stays dark and device does not boot further. However the laptop can be turned off what was not the case with the dead rom.

    When turning on, short traffic at the Bios-Rom pins (CS,SO,SI,CK) can be observed with a cheap oscilloscope.

    My assumption (and hope) is that Bios-version and EC-version must match. Is this correct? Unfortunately I do not have a backup of the EC nor of the older Bios firmware.

    Could I get an older version of the EC firmware?
    Is the EC firmware also customized?
    How could I flash it?

    Or how could I customize an older version of the vanilla rom from Lenovo page with the data from the backup version?

    Maybe my assumption is completely wrong and there is another fancy security feature (UEFI) that prevents from booting...
    Last edited by webwicht; 10-26-2021, 02:03 PM.
    Tags: None
    • SMDFlea
      Super Moderator
      • Jan 2018
      • 20795
      • UK
      #2
      Re: Lenovo Yoga 2 13 Bios Rom &lt;&gt; EC

      Originally posted by webwicht
      Now I found a backup copy of the Bios-Rom 1.17 for this computer on my hard drive
      Post your backup here in a zip or rar .
      All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

        Comment

        • webwicht
          New Member
          • Oct 2021
          • 8
          • Germany
          #3
          Re: Lenovo Yoga 2 13 Bios Rom &lt;&gt; EC

          Originally posted by SMDFlea
          Post your backup here in a zip or rar .
          Attached find the Backup. It says:
          1V$96CN31WW(V1.17)
          Attached Files

            Comment

            • webwicht
              New Member
              • Oct 2021
              • 8
              • Germany
              #4
              Re: Lenovo Yoga 2 13 Bios Rom &lt;&gt; EC

              EC-Rom data seems to be not customized and programming of Embedded controller KB9012 seems to be possible with moderate means as explained here:
              http://dangerousprototypes.com/docs/...ith_Bus_Pirate

                Comment

                • webwicht
                  New Member
                  • Oct 2021
                  • 8
                  • Germany
                  #5
                  Re: Lenovo Yoga 2 13 Bios Rom &lt;&gt; EC

                  Meanwhile I am able to read and write Embedded Controller KB9012.
                  I flashed the EC.BIN for the 1.17 that I found in the forum and flashed it.
                  However the laptop still does not boot.
                  But I realized that the Fan moves now, the power LED blinks from time to time and the Laptop beeps when starting.
                  I am not sure if my assumption is correct that EC-Rom needs not to be customized.
                  Last edited by webwicht; 12-27-2021, 12:39 PM.

                    Comment

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