How to factory reset NOKIA Lumia 638? How to wipe all data in NOKIA Lumia 638? How to bypass screen lock in NOKIA Lumia 638? How to restore defaults in NOKIA Lumia 638?
The following tutorial shows all method of master reset NOKIA Lumia 638. Check out how to accomplish hard reset by hardware keys and Windows Phone 8.1 settings. As a result your NOKIA Lumia 638 will be as new and your Snapdragon 400 core will run faster.
Nokia Lumia 638 hard factory reset - video
Hard Reset will erase all of your data
All described operations you are doing at your own risk.