This is the method recommended in the most recent "updated" XDA posts.
When OPPO abandoned the F3 Plus after a buggy Nougat rollout, the developers at XDA Forums took over. The thread for the OPPO F3 Plus (codename: CPH1613) is a goldmine. Here is what the "updated" forum threads are currently discussing.
Device: Oppo F3 Plus (CPH1613)
Previous OS: Android 6.0 Marshmallow + ColorOS 3.0
Update: Android 7.1.1 Nougat + ColorOS 3.1
Status: Rolling out gradually (stable) oppo f3 plus nougat update forum xda updated
Unofficial Nougat ROMs
User Experiences
Risks & Warnings
After months of waiting (and plenty of “Oppo pls update” posts), the F3 Plus finally started receiving the Nougat update in late 2017–early 2018. While late compared to the competition, the update brought meaningful changes—especially to multitasking, notifications, and performance. This is the method recommended in the most
Build numbers observed: