You can download official firmware from repositories like Oppo Stock ROM or FirmwareFile and install it manually by booting into recovery (Power + Volume Down). 2. Unofficial Android 8.0 Oreo Options
Before seeking unofficial downloads, ensure your device is on the latest officially supported firmware. While this will likely remain at Android 6.0, it ensures stability and the latest security patches available for that version. Oppo F3 Update 8.0 Download
The Oppo F3 officially runs on with ColorOS 3.0, and there has been no official Android 8.0 (Oreo) update released by Oppo for this specific model . While some older community discussions suggested it might receive the update, Oppo never officially rolled out a stable Oreo version for the F3. You can download official firmware from repositories like