I'm using Asus Zenfone 2 laser Android device. When I bought the device one of my office colleague did the set up for me. Yesterday I did factory reset. After reset I tried to access my mobile. It asked me to use Owner's Google account which I used before in that device for sync. I do not have that mail id nor do I have that person's contact.
I have the bill for the phone. Is there anything I can do to bypass this authentication?