TS2391: MacBook Air (Original), MacBook Air (Late 2008), and MacBook Air (Mid 2009): Recovering a lost EFI firmware password

Learn about MacBook Air (Original), MacBook Air (Late 2008), and MacBook Air (Mid 2009): Recovering a lost EFI firmware password
杨炳锋

Q: For firmware reset,Hash code for: ****

For firmware reset,Hash code for: ****

 

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MacBook Pro, OS X Mountain Lion (10.8.5), null

Posted on May 5, 2016 9:56 AM

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Q: For firmware reset,Hash code for: ****

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  • by 杨炳锋,

    杨炳锋 杨炳锋 May 5, 2016 9:56 AM in response to 杨炳锋
    Level 1 (0 points)
    May 5, 2016 9:56 AM in response to 杨炳锋

    My macbook  pro is 2010 years production, through the network recovery upgrade once Lion system, start again, according to the Commond + S or option button to enter all need password, search the web for once, at the same time hold down shift + option + command + S will appear a 33 a Hash code, my Hash code is: ****, please each elder to answer it, how to work out the password?

    thank you !

     

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  • by Linc Davis,

    Linc Davis Linc Davis Nov 16, 2013 12:51 PM in response to 杨炳锋
    Level 10 (207,958 points)
    Applications
    Nov 16, 2013 12:51 PM in response to 杨炳锋

    It is not possible to recover a password from the hash. Take the computer to an Apple dealer to have the password removed.

  • by DennisKharin,

    DennisKharin DennisKharin May 5, 2016 9:51 AM in response to Linc Davis
    Level 1 (4 points)
    May 5, 2016 9:51 AM in response to Linc Davis

    Wrong, It's Possible. Last 16 digits and letters is Md5 hashes containing his password, the other 16 (first one) containing info about his machine. Basically you can brute force it or rainbows tables the last 16 digits and numbers , on the good computer it shouldn't take that long...


    *All information was given just for the learning purposes not for use against Apple INC.*

  • by GiveMeAnthony,

    GiveMeAnthony GiveMeAnthony Sep 12, 2016 11:42 AM in response to DennisKharin
    Level 1 (8 points)
    Mac OS X
    Sep 12, 2016 11:42 AM in response to DennisKharin

    The character string provided by ⇧⌃⌘⌥S at the firmware password dialog is 33 printable characters long. An md5 hash is 16 bytes long (32 hexadecimal digits) and can contain any non-printable character. So, how do you figure the last 16 digit character sequence refers to an MD5 hash containing the password?