How to unlock Xiaomi Redmi 3?

I bought a use redmi3 mobile phone from a chines friend of my while he was in Liberia on peace mission, but now I am facing problem with the mi account witch he use to open the phone, but recently  I lost contract with hem, since he went back to china in 2016, I live in  west Africa Liberia,




I bought a use redmi3 mobile phone from a chines friend of my while he was in Liberia on peace mission, but now I am facing problem with the mi account witch he use to open the phone, but recently  I lost contract with hem, since he went back to china in 2016, I live in  west Africa Liberia, how am i going to unlock this phone please help



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