If you have enabled Android Device Manager on your device, you can reset your password from the Device Manager website. Follow these steps: (1) Log in to Android Device Manager (2) Select your device (3) Select 'Lock' (4) Enter a new, temporary password for your device and click 'Lock' (5) Enter the temporary password on your device (6) Go to your lock screen settings and disable the temporary password you created. If this doesn't work or you do not have Android Device Manager enabled, you will probably have to do a factory reset. Follow kris's instructions or check out the troubleshooting guide.
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