How to Easily Master Format OPPO A57 with Safety Hard Reset?

hard reset oppo a57

This phone use standard screen size IPS screen type with 5.2″ size HD resolution. It has dual simcard slot which also can standby together like other Oppo smartphone. The first operating system installed at OPPO A57 is Android Marshmallow. If we are really like OPPO user interface then OPPO A57 already use Color OS version 3.0. The … Read more