Ursprünglicher Beitrag von: Iris Holland ,
You don’t have Apple ID and password, so it is impossible for you to unlock it with icloud. If you have synced your device to a computer in recent times, you can try to restore the device via itunes. If not, you can only turn to the third-party software. For myself, I used a windows unlocker called joyoshare ipasscode unlocker to remove the locked screen and it succeeded. Maybe you can have a try.