How do I reset the firmware password on my MacBook Pro 2009?

Hi every body,
I'm Manh, as you see on the forum. Well i got a macbook pro 2009 that i bought from a friend, 1 month ago, the firmware is protected by a password, and it i can not boot form my hdd, when i google it, i found the firmware password should be remove or reset, but i don't know how to reset it. Please help me, because i ain't got any other to work. Thanks!

My friend bought it directly from Apple. I think this is a bug . Because my friend and I'd never set a firmware password before, Actually, icloud account in this mac is mine. Anw thanks for your comments. Any recommendation is highly appreciated!

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