Hard resetting the device would help you to resolve this issue.1.Power off the phone.2.Press and hold Vol+ key and Power key simultaneously until several blue sentences appear on the screen which are reboot system now; apply update from sdcard; wipe data/factory reset; wipe cache partition3.Use Vol+ key and Vol- key to move the cursor to "wipe data/factory reset" and press camera key to confirm it.4.There are many words "No" and one sentence "Yes -- delete all user data". Use Vol+ key and Vol- key to move the cursor to "Yes -- delete all user data". Press camera key to confim it.5.The phone will finish the reseting by itselft after about 10 seconds later and then the cursor will be on "reboot system now" and press camera key to confirm it. The phone will reboot automatically.There is no unlock and password any more after the phone is on.