How to Unlock Android Device Without a Registered Gmail or Email Account

1. Turn off your Android device.
2. 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.
3. Release the buttons once your Android device is powered on.
4. Scroll using your "Volume up and down" button until you find the "Factory Data Reset" option.
5. Tap the "Factory Data Reset" option.
6. Tap "Reset phone".
7. This will erase all of your data, but it will allow you to unlock your Android mobile device.
8. A confirmation message to clear data will appear.
9. Select "Erase everything", which will permanently delete all of the data.
10. You should now be able to use your Android device without previously having had a Google Account or email address registered.
11. Make sure you review this guide to see the standard recovery options, and set up an alternate method to recover your phone in the future, so you don't have to perform another "Factory Data Reset."
12. Don't forget to put your SD card back, and copy your files back to your device, from the location you saved them to on your computer.