: Flashing the firmware via QFIL will perform a clean install, wiping all personal data, photos, and apps currently stored on the internal memory. Ensure you have backed up your data if you can still access the phone beforehand.
Press and hold the button for roughly 10–15 seconds until the Oppo logo appears. Oppo R9s Plus Firmware Qfil
For a totally dead Oppo R9s Plus, .