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While these low level passwords are quite secure, but that higher security also means a forgotten firmware password can be a significant problem.Nonetheless, if you wind up in a situation where you or another user has forgotten a low level firmware password on a Mac, don’t panic, because you may be able to recover the password or bypass it using one of the methods outlined below.In most cases, you will need to provide proof of ownership of the Mac which has a locked firmware password in order for them to unlock the computer in question.There may be exceptions for a variety of unusual circumstances, discuss those with them if necessary.
Have another solution to unlock a Mac with a long forgotten firmware password?
The firmware password appears immediately upon boot and is a gray locked icon, looking like this: If the password you’re having trouble remembering is a general Mac login or administrator password, you can reset it with these instructions instead.
Using the the Apple ID approach on boot is typically the easiest for modern Macs.
It then passes the functionality to the bootloader or the operating system.
With the advancement of technology, the older version of BIOS is replaced by UEFI which stands for Unified Extensible Firmware Interface.