“The Oppo F3 and F3 Plus will not receive the Android Oreo update. The devices will continue to run on Android Marshmallow with ColorOS 3.0/3.2.”
In mid-2018, Oppo’s India support team publicly stated:
Updated security patches protect against newer vulnerabilities.
Move these zip files to your phone's SD card. oppo f3 android 8 update download
Flash a custom recovery like Team Win Recovery Project (TWRP).
The Oppo F3 originally shipped with and ColorOS 3 . While some regions received a beta update or official migration to Android 7.1 Nougat , the manufacturer never rolled out an official migration to Android 8 Oreo. Last Official Version: Android 7.1 Nougat (ColorOS 3.1).
You can locate the authentic ROM packages through the official channel: “The Oppo F3 and F3 Plus will not
There are no plans for an official Android 8.0 Oreo or newer update for the Oppo F3. How to Check for Official Software
Search XDA Developers Forums for "OPPO F3" or "OPPO F3 LineageOS 15.1". As of this writing, the most stable Android 8.1 builds for the F3 include:
Several factors likely contributed to OPPO's decision: Flash a custom recovery like Team Win Recovery
You cannot flash a custom Android 8 ROM using the stock Oppo recovery menu. You must install Team Win Recovery Project (TWRP).
Oppo officially ended software support for the Oppo F3 with Android 6.0 Marshmallow and its ColorOS 3.0 skin. Oppo never released a stable, official Android 7 (Nougat) or Android 8 (Oreo) update for the standard Oppo F3 (model CPH1609).