How to hard reset an iPhone 4 step by step?

I need help, my dad's friend gave me his iPhone 4 and I try to hard reset it through the settings. It can up as a different email from the previous owner. Now they turned on the Find my iPhone app and they know where my phone is at. How do you reset it with a computer

Dad's friend has to log into his computer and cut off his iCloud Find my iPhone, or you have to call/email him and get the password. Without it, you can't reset the phone for you to use. Resetting the phone does not remove Find my iPhone. Only dad's friend has the power to do that. Best luck.

You can't if your own ID is not assigned to it, only the owner can turn off find my iphone or reset it as thats a security feature. They should have wiped it before giving it to you.

You can't and the phone is stolen.

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