For those comfortable with advanced modifications, LineageOS Downloads offers unofficial builds of Android 7.1 (LineageOS 14.1) which provide a "stock" Android experience without the ColorOS skin. Key Features of the Nougat Update
The safest method is to visit the OPPO Global Software Upgrade page and use their System Upgrade Tool. oppo f3 nougat update file download top
Reply to messages directly from the notification bar without opening the app. For those comfortable with advanced modifications