You can easily create a new administrator account if you have a copy of the Mac OS X Installation Disk, but what if you don’t have one on hand, and don’t know the previous administrator’s password? This method tricks the computer into thinking that it’s brand new. It leads you through the easy setup process to create a new administrator account.
Single-User Mode (SUM) can be locked on your computer via a firmware password, thus preventing you from gaining root access on the machine. This method helps circumvent that obstacle when it’s locked on the machine. SUM allows you to execute commands that only the root user can execute, which includes extracting password hashes.
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