Some users may find that update availability varies by region and network carrier. Not all OPPO F3 units support the same update path. If your device was purchased from a specific carrier, the rollout schedule may differ.
If you cannot find the file or the official update is gone, you have two remaining options: oppo f3 android 8 update download
The Android 8 update for the Oppo F3 brings several significant changes, including: Some users may find that update availability varies