To get Android 8.0 or higher, you would need to install a Custom ROM (e.g., LineageOS), but this is for average users due to the following:
In this extensive guide, we will cover:
The Oppo F3 originally launched on with ColorOS 3.0. While some regions received a minor upgrade to Android 7.1 (Nougat), the manufacturer stopped software support for this device due to its aging hardware profile. ⚠️ Important Warning on Third-Party Downloads oppo f3 android 8 update download