if you forget your device password. you need to reset your device password. this post i will tell you how to hard reset your device password. at first backup your all impotent data contact number, message, photos, videos etc.
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1. Now Press And Hold Power Button To Turn OFF Your Device.
2. After Turn Off Your Device Than Press Power Key until Vibrates
3. Than Press And Hold Volume Down key Until Show on Display The Exclamation Point.
4. When Show Exclamation Point on Screen Release all keys.
5.Press the following sequence of buttons: Volume Up > Volume Down > Power > Volume Down.
Done.