When the OPPO logo (or "Powered by Android" text) appears on screen, release only the Power button (keep holding Volume Down).
Keep holding Volume Down for 3-5 more seconds. The screen will change to a dark menu with small text – you are now in Recovery Mode . How to Open Recovery Mode on OPPO F19 Pro
Use Volume buttons to navigate up/down. Press the Power button to select an option. Method 2: From System Settings (ADB Reboot) Use this if your phone is working normally and you want to avoid button gymnastics. When the OPPO logo (or "Powered by Android"