How can I remove an EFI firmware password in a 2012 MacBook Pro Retina?

This computer was bought used. The SSD in it is dead, and it has an EFI firmware password blocking all my boot options. How can I remove it? The closest store is 400 miles away.

"YOU" CAN'T. You need to take the system to an Apple store or possibly an Apple Authorized repair center and ask them to remove it.
If you bought it used contact the original owner and ask for the password. Once you know that "YOU" can remove it.
If you come back with I can't get in touch with the original owner then I have no more help for you. Take it to your nearest Apple store.

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