undo the sync
I synced my new iPhone via PC and it prompted 2 options when I plugged in: new iPhone or previous account. I chose using the previous account worried that old contents would be missing. The phone got into reset mode and it ended up that all my new iPhone contents (photos/videos etc) were missing and downloaded with previous account contents. Please help me to recover the new contents.
iPhone 6s Plus, iOS 9.3.1