How to factory reset ZTC ZT8191? How to wipe all data in ZTC ZT8191? How to bypass screen lock in ZTC ZT8191? How to restore defaults in ZTC ZT8191?
The following tutorial shows all method of master reset ZTC ZT8191. Check out how to accomplish hard reset by hardware keys and Vendor settings. As a result your ZTC ZT8191 will be as new and your core will run faster.