How to factory reset OPPO A57? How to wipe all data in OPPO A57? How to bypass screen lock in OPPO A57? How to restore defaults in OPPO A57?
The following tutorial shows all method of master reset OPPO A57. Check out how to accomplish hard reset by hardware keys and Android 6.0 Marshmallow settings. As a result your OPPO A57 will be as new and your Qualcomm Snapdragon 435 MSM8940 core will run faster.
Hard Reset will erase all of your data
All described operations you are doing at your own risk.