Efi Firmware Password Removal

Note: This method does not work on Macs from late 2010 onwards.

If these don't work, it's time to look at the official recovery methods. efi firmware password removal

On some business laptops, you can use a Windows bootable USB with the manufacturer's own BIOS Configuration Utility (BCU) to clear settings if the firmware isn't locked down. I booted a Linux live USB, ran dmidecode to read the firmware version, then tried the vendor's clear command. The laptop refused. The admin had set "User + Admin" lock—the nuclear option. Note: This method does not work on Macs

If you haven't set a password yourself but are seeing the prompt, it is possible that a default password was used by a previous owner or a repair shop. I booted a Linux live USB, ran dmidecode

There is a high probability that the machine is stolen. Without the original receipt, you will never be able to unlock it, and you will be stuck with a computer that cannot have its OS reinstalled.

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The silver padlock was gone. Instead: "Checksum error. Press F1 to enter setup."