Same thing happened to me a while ago on a iphone 5 i had brought second hand the previous owner had done a factory reset but it was still linked to his Find my iphone app via his apple id so when i updated it wouldnt activate i managed to contact the previous owner and he gave me his details to activate it and remove it from his find my iphone app i got it sorted eventually but it was a right pain in the arse Apple were no help at all they said i need to contact the person i got it off
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