Oppo Flash File download (Stock ROM)

Download the Firmware and place it into root folder of MicroSD card.
1- Your Oppo Phone must be 30-40 percent charge to perform flashing.
2- Switch off Phone.
3- Press & Hold Power + Volume down until Oppo logo appears.
4- Select Language using touch.
5- Now, Out of the option. Choose, Wipe Data & Cache.
6- Select Install from memory card.
7- Select the zip file.
8- Upload starts and when completed reboot the phone.