A1989 Macbook Pro unable to reinstall macOS after DFU recovery

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  • LozinMust
    Member
    • Apr 2023
    • 24
    • Portugal
    #1

    A1989 Macbook Pro unable to reinstall macOS after DFU recovery

    Hello guys,

    I've been learning about computer repairs and got a MacBook Pro A1989 that had some liquid damage. After thorough cleaning, the board was getting 20V and 1A+ when the battery was connected but the laptop still wasn't booting. The symptoms were similar to another thread I found here (https://www.badcaps.net/forum/showth...hlight=20V+amp) so I followed the advice of entering DFU mode and was able to recover the firmware and it is now booting (the revive option was giving me an error, so I had to erase everything).

    However, I've been unable to install macOS on it. I tried internet recovery but get a message "Security Settings do not allow this Mac to use an external startup disk" after it reboots. Reinstalling macOS from the macOS utilities gives me an error saying "the recovery server could not be contacted".

    Sorry in advance for being a noob, but I'm still learning. Hopefully someone in here can help me fix this issue.
    Tags: None
    • donnos
      Member
      • Sep 2016
      • 11
      • Malaysia
      #2
      Re: A1989 Macbook Pro unable to reinstall macOS after DFU recovery

      are you able to get into recovery? if yes go to disk manager and see if it is able to detect the internal HDD

      if you have issues getting into recovery due to internet issues, suggest using a usb c to ethernet dongle and try

        Comment

        • LozinMust
          Member
          • Apr 2023
          • 24
          • Portugal
          #3
          Re: A1989 Macbook Pro unable to reinstall macOS after DFU recovery

          I don't understand why, but when I press cmd+R it goes into internet recovery and no drives are listed.

          I was able to enter the startup manager by pressing the option key and then went into disk utility. There, I saw that the main SSD was not initiated, but after erasing it, I was able to initiate it. Still, the same problem persists when trying to use internet recovery, I get a message saying "Security Settings do not allow this Mac to use an external startup disk" after it reboots.

            Comment

            • LozinMust
              Member
              • Apr 2023
              • 24
              • Portugal
              #4
              Re: A1989 Macbook Pro unable to reinstall macOS after DFU recovery

              I finally got it to work by restoring from an external HDD with Time Machine. Thanks for the help.

                Comment

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