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MacBook Air 13" A1932 Wont DFU, Turns on etc.

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    MacBook Air 13" A1932 Wont DFU, Turns on etc.

    Powers on everything, keyboard types LCD works, all functions there, however it gets to OS progress bar and then hits error support code -9000F (which is easily fixed with DFU reset) . Thought it was the keyboard so orderered a new on, tested that board on a good board and it went into DFU, so put the keyboard back into this board and no luck. Tested power button, it turns it off and on no issue, what could be causing this board to not go into DFU whatsoever? Battery is good as well. This is new to me and was wondering if anyone has a solution, the board is not activation lock, it just needs to get DFU restored to get rid of the -9000F support error to get into OS install.
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    MEOWING IN THE IMPOSSIBLE UNIVERSE!

    #2
    Re: MacBook Air 13" A1932 Wont DFU, Turns on etc.

    https://discussions.apple.com/thread/250501103

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      #3
      Re: MacBook Air 13" A1932 Wont DFU, Turns on etc.

      Hey mon2 how are you? So this does not explain the DFU issue. This error -9000F can be easily fixed with a DFU restore. There is no data on this computer and needs to get restored to fix this error. Our wifi is good as well. Sadly it wont get into DFU.
      sigpic
      MEOWING IN THE IMPOSSIBLE UNIVERSE!

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        #4
        Re: MacBook Air 13" A1932 Wont DFU, Turns on etc.

        Any idea?
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        MEOWING IN THE IMPOSSIBLE UNIVERSE!

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          #5
          Re: MacBook Air 13" A1932 Wont DFU, Turns on etc.

          I guess this is a no clue for anyone? Also got it plugged into an external ethernet and it booted to the error again. So I have no idea what is to come of it.
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          MEOWING IN THE IMPOSSIBLE UNIVERSE!

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            #6
            Re: MacBook Air 13" A1932 Wont DFU, Turns on etc.

            I believe we found the issue. Controller chip was not allowing communication between the USB cables besides charging. Will keep you posted.
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            MEOWING IN THE IMPOSSIBLE UNIVERSE!

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              #7
              Re: MacBook Air 13" A1932 Wont DFU, Turns on etc.

              Interesting. So booting from USB media should also fail. Does it?

              What are the diode readings for the usb connector pins of each ACE controller?

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                #8
                Re: MacBook Air 13" A1932 Wont DFU, Turns on etc.

                Yes usb media shows then fails.
                sigpic
                MEOWING IN THE IMPOSSIBLE UNIVERSE!

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                  #9
                  Re: MacBook Air 13" A1932 Wont DFU, Turns on etc.

                  Good stuff. Check on the esd diodes on the usb connector with the diode mode.

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                    #10
                    Re: MacBook Air 13" A1932 Wont DFU, Turns on etc.

                    Originally posted by Stephen View Post
                    I believe we found the issue. Controller chip was not allowing communication between the USB cables besides charging. Will keep you posted.
                    How did you confirm this? I.e. what was the fix?

                    Was going to suggest the T2 ROM, but sounds like you got it resolved!

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                      #11
                      Re: MacBook Air 13" A1932 Wont DFU, Turns on etc.

                      the battery controller is blocked, the laptop has been sitting for a long time, maybe. you need to connect a working battery, if the laptop does not see the battery, it will slow down. try booting the laptop by holding the shift key

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