Ensure your phone has at least 40% battery to prevent it from shutting down during the installation.
Updating your to Android 7.1.1 Nougat brings significant improvements, including ColorOS 3.1 , split-screen multitasking, and optimized battery performance. While some devices may not receive an OTA notification automatically, you can manually download and install the working firmware file to complete the update. Download Working Nougat Firmware for OPPO F3 download file firmware update oppo f3 nougat work
If your phone is currently on Android 6.0 Marshmallow, follow these steps to install the downloaded file: Ensure your phone has at least 40% battery