Cake
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    • On startup, click on "Other"

      Enter username: root and leave the password empty. Press enter. (Try twice)

      If you're able to log in (hurray, you're the admin now), then head over to
      System Preferences>Users & Groups and create a new Admin
      account.

      Now restart and login to the new Admin Account (you may
      need a new Apple Id). Once you're logged into this new Admin Id, you can
      again proceed to your System Preferences>Users & Groups. Open
      the Lock Icon with your new Admin ID/Password. Assign "Allow user to
      administer this computer" to your original Apple ID. Restart.

      https://forums.developer.apple.com/thread/79235

    You've been invited!