HT201441 the device has already been erased, but is still linked to the previous owner's account, you will be prompted for the previous owner's Apple ID and password during the device setup and activation process

I could not contact the previous owner so that can help me the way you have described

The Help page you came here from gives you all the information; without the previous owner's password or his removing the phone from his list of devices you cannot proceed and I'm afraid your phone is useless.

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