Does anyone know how to reset firmware password?

Hello there

Few days ago a got an used macbook pro 15" but my surprise was when I turn it on the computer asks me a PIN CODE, and I don´t it, so I tried to restart the IOS and I can´t get it because it also request me a password.

Does anyone know how to fix this? I´ve tried removing RAM memory but it didn´t work for me.

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