How to wipe my iphones activation lock?

So i bought this iphone off craigs list, and the icloud account is still linked to the iphone. So i call the person who sold it to me, but he dosent answer. So now i have an iphone that i can't use becuse the activation lock is still on it, and i can't find the apple id of the original owner. If i take aprt the phone and do something to the mother board, can i wipe the phone along with the icloud account? Is there any way i can remove the icloud lock? If i take it to aplle, will they help me?

btw, the phone is not in lost mode

You can restore it via itunes. Just click restore in the info page on itunes when you connect your phone.

You can't, you have to check this before buying. Apple can't do anything, this is a security feature.

Activation Lock is a feature of Find My iPhone that is built in to iOS 7. It's designed to prevent reactivation of lost or stolen iOS devices by requiring the user's Apple ID and password before anyone can turn off Find My iPhone, erase the device, or reactivate and use the device.

Mobile device administrators can manage Find My iPhone Activation Lock by supervising devices with Apple Configurator or the Device Enrollment Program.

In iOS 7.1 or later, you can use a compatible MDM solution to enable Activation Lock when a user turns on Find My iPhone. Your MDM solution can store a bypass code when Activation Lock is enabled and later use this code to clear Activation Lock automatically when you need to erase the device and deploy it to a new user. Refer to your MDM solution documentation for details.

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