the phone completely. Wait 5–10 seconds after screen goes black.
The screen will remain black (no backlight). Your PC will detect a "Qualcomm HS-USB QDLoader 9008" port. This is not Fastboot, but it is the only way to perform deep-level flashes on this device. How to Open Fastboot Mode on OPPO R17
: Use the Volume keys to scroll through options and the Power button to select them. the phone completely
: Press and hold the Power button for a few seconds and select "Power Off". How to Open Fastboot Mode on OPPO R17
This is the most common method and is especially useful if your phone is stuck in a boot loop or cannot access the main system.
: Go to Settings > About Phone and tap Build Number seven times to enable Developer Options.