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Trying to erase and reinstall macOS on a MacBook Pro that might have been a corporate loaner formerly with some kind of security software.

I have tried:

  • erasing and booting from an external drive, but the drive isn't showing in the restore window.
  • resetting the admin password; this also failed.

Anybody got a suggestion?

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    Precise Mac model is important here, and precise details of the 'locked' message[s].. Newer Macs, the only people who can release it are those who locked it. You own a brick until that happens.
    – Tetsujin
    Sep 11 at 18:08
  • Ask the previous owner how it was locked and did they remove the locks from it.
    – mmmmmm
    Sep 11 at 18:38
  • Is this a firmware password? If your not sure, try booting into recovery mode with CMD-r during boot up. If a lock shows up with a textbox for a password, it means you’ve hit a firmware password. You can’t do a clean install with a firmware password unless you know the password or can reprogram the eeprom with a flasher
    – anonymous
    Sep 11 at 19:53

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