How to factory reset AVVIO L640? How to wipe all data in AVVIO L640? How to bypass screen lock in AVVIO L640? How to restore defaults in AVVIO L640?
The following tutorial shows all method of master reset AVVIO L640. Check out how to accomplish hard reset by hardware keys and Android 5.1 Lollipop settings. As a result your AVVIO L640 will be as new and your MediaTek MT6735M core will run faster.
Hard Reset will erase all of your data
All described operations you are doing at your own risk.