Macbook M1s exclamation mark not seen in DFU

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  • sjsul
    New Member
    • Dec 2021
    • 4
    • China
    #1

    Macbook M1s exclamation mark not seen in DFU

    Hi colleagues,

    I have a situation with 2 Macbooks M1, 1x A2337 and 1x A2338. I will post below the symptoms and what I have tried until now

    - They both power on and display the exclamation mark 1 second after displaying the Apple Logo
    - They both try to enter Recovery but after restart they loop in the step above, showing the exclamation mark
    - They both enter DFU but are not recognized by the other computer. Also tried force DFU, bot have voltage on SOC_DFU_STATUS. Still not found by other computer in Apple Configurator or Finder, used more cables, TBT3 and TBT4
    - Both USB ports on both laptops are stable, drawing 20.6v and 0.3a with no battery connected
    - On the A2337 tried replacing the Thunderbolt Controller UF000 and also PMIC U8100. The problem remains the same.
    Tags: None
    • icfix2499
      Ic-notebook
      • Nov 2021
      • 6
      • thailand
      #2

      BIOS is bad. Update BIOS and restore again.​

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