Factory unlocked. Logout from icloud without pass?

My bro gave me his iphone 4s that is updated to 7.1.2 but i can't get a hold of him.
i want to login with MY icloud. Any way to logout from his id?

Ask him to take it with ou to the store where it was purchased
so ou can get their expert assistance to transfer the I.D. From his to yours.

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