Reset or try reinstalling the current firmware.
To reset.
-Turn off your Android device.
-Press and hold the "power", "volume down", and "camera" buttons simultaneously. If your mobile device does not have a camera function, just press and hold the "power" and "volume down" buttons.
-Release the buttons once your Android device is powered on.
-Using your "Volume up and down" button until you find the "Factory Data Reset" option.
-Select the "Factory data reset" option by the power button.
This will help you to unlock the mobile but remember that you will lose all the data.