Oppo released the Oppo A57 smartphone in November 2016. This phone comes with a 5.2 inch IPS screen that is supported by a Qualcomm Snapdr...Read More
- Activate your device
- At least 50% battery level (more is better)
- Make full copies of important data, to avoid in case of data loss caused by unforeseen circumstances.
- A stable Internet connection (preferably using Wi-Fi)
- USB cable (try to use the original)