While there is no official Oreo update, some users turn to like LineageOS to install higher Android versions.

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A clean, bloatware-free Android 8.1 Oreo experience with all core features: picture-in-picture, notification channels, autofill APIs, and better background app management.

Thanks to developers on forums like XDA-Developers, there are stable unofficial builds of (Android 8.1 Oreo) and crDroid for the Oppo F3/F3 Plus.