Have you successfully installed Nougat on your Oppo F3 Plus? Head over to the XDA thread (link in source) and share your build.prop tweaks. The community is small, but it is still breathing.

Yes, but it is more complex than upgrading. Downgrading firmware erases all data and carries risks. The safest approach is to visit an authorized Oppo service center, as performing the downgrade incorrectly could potentially damage the device.