How to remove Icloud ios 8.2?

My relative has brought an iphone for me as gift and it is not block but the icloud is open and he forget the password.So how to delete the Icloud. I have gone to bazar they asked me 10000 r.s means 110 $.
And I don't have that much.

Not possible. It's there for a reason.
It's a useless phone now until your relative can remember the password.
Ask him/her to reset it through Apple.

Changing logic board is the only option you have now

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