How to factory reset IRBIS SP551? How to wipe all data in IRBIS SP551? How to bypass screen lock in IRBIS SP551? How to restore defaults in IRBIS SP551?
The following tutorial shows all method of master reset IRBIS SP551. Check out how to accomplish hard reset by hardware keys and Android 7.0 Nougat settings. As a result your IRBIS SP551 will be as new and your MediaTek MT6737T core will run faster.
Hard Reset will erase all of your data
All described operations you are doing at your own risk.