Press and hold the Power button on the right side of your phone until the power menu appears. Tap Power Off or slide down to turn the device completely off. Wait a few seconds for the device to vibrate and go totally dark.
to check if your PC recognizes the device once it's in Fastboot? how to open fastboot mode on oppo a37 better
: Once the Fastboot text or logo appears on the screen, release all buttons. Method 2: ADB Command (Via Computer) Press and hold the Power button on the
button for about 10–15 seconds until the device restarts normally. Troubleshooting how to open fastboot mode on oppo a37 better
Some Oppo devices have system features that can interfere with hardware key combinations. Go to → Accessibility or Gestures & Motion and turn off any quick‑start or wake gestures that might trigger unexpectedly.