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Clean install OS X on a Macintosh computer made during or after 2011 with an unknown EFI password. You can still boot to a USB drive if you have either the password for OS level access (TLDR at end) or firmware (EFI/BIOS) password for a post-2011 Macintosh computer. If the OS is in an unbootable state, this method may not work. My father and I were trying to use a Mid-2011 Apple iMac to run some games and it was exhibiting strange issues with no clear fix. Before I left California for college in...