If you own an Oppo F3 still running Marshmallow, XDA threads provide the following safe method:
A final blow to the F3's upgrade potential came from news that for the device. This left the Nougat update as the final official stop for the phone, cementing its status in the XDA forums as a device whose potential was never fully unlocked by the manufacturer, leaving its future in the hands of a small, dedicated community of developers.
: Custom ROMs remove heavy ColorOS bloatware. Opposite F3 Nougat Update Forum Xda
Go to Install , select the Custom Nougat ROM zip, and then select the compatible OpenGApps zip (for Google Play Services). Reboot: Swipe to confirm flashing and reboot your device. Common Issues and XDA Community Fixes
Always check your Build Number in Settings > About Phone before proceeding. If you own an Oppo F3 still running
Some "official" Nougat 7.1.1 ROMs for the Oppo F3 (model CPH1609) have been shared via Google Drive links in YouTube tutorials and community threads.
The user request for "Opposite F3" hints at a common sentiment in the community: XDA is the "opposite" of the stock MIUI experience. Go to Install , select the Custom Nougat
on how to manually flash the official Nougat firmware for the Oppo F3? Oppo F3 - CPH1609 - Request a Device - /e/OS community
The update generally brought a better Google Assistant, night mode (blue light filter), GIF support in the keyboard, and enhanced privacy controls. 2. Oppo F3 Nougat Update Forum: The XDA Developers Resource