Take it to an Apple store; just tell them you forgot your firmware password; they should be able to reset.
(sorry, not really an answer; just don't want to see you wait for a hacker who might share his trick)
I’m happy to assist further over the phone at https://www.6ya.com/expert/shunter_ccf54e0913bd0501
Really, You have to contact your nearest Apple customer care for better solution.
Www.iunlockefi.com will unlock any Apple Mac Computer that is EFI and iCloud locked! No questions asked and lifetime guaranteed.
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