Press and hold the Power Button and Volume Down Button simultaneously until the Oppo logo appears, then release them.

In some countries, OPPO service centers still flash legacy firmware for free. Call ahead and ask if they can upgrade your F3 to Android 7. Bring a valid ID and proof of purchase.

If this is your primary phone, consider upgrading to a newer device. If it is a backup or media player, Android 7 is perfectly fine.

This is the safest and easiest method to update your device. Connect to a stable Wi-Fi network. Go to > Software Updates . The system will automatically check for available updates.

: There was never a global, stable OTA (Over-The-Air) update for Android 7 on the standard OPPO F3 in many regions, including India. However, an official Nougat update was released for the OPPO F3 Plus .

If your phone is still on Android 6.0 and has never been updated:

If you cannot find a reliable Android 7 download, staying on Android 6.0 Marshmallow is stable, albeit outdated. You can still sideload apps via APKs, but security is poor.

Go directly to the official Oppo Support website for your specific region (e.g., Oppo India, Oppo Philippines). Avoid third-party forums which might host altered or malware-infected ROMs.

Press and hold the and Volume Down Button simultaneously until the Oppo logo appears. Release the buttons to enter Oppo Recovery Mode. Select your preferred language (e.g., English ). Tap on Install from storage device .

If you'd like more specific assistance with your device, let me know: Is your phone currently or running a custom ROM ?