Mac Efi Firmware Password Removal Tool File
: If you have proof of ownership, Apple can provide a one-time challenge-response file. By pressing Shift-Control-Option-Command-S on the lock screen, you'll see a unique hash to give to an Apple support agent.
Depending on your Mac's age and hardware, you can use several professional tools and methods to remove the lock. 1. Official Removal (Recommended) mac efi firmware password removal tool