Oppo F3 was released in 2017 with Android 6.0 Marshmallow. The official final update for this device is Android 7.1 Nougat (ColorOS 3.1). Oppo no longer provides over-the-air (OTA) updates for this model. You will likely need to use the offline OTA package or firmware flash file .
.ozip is OPPO’s encrypted format. You cannot flash it manually. You must either decrypt it on a PC or use the official OPPO System Updater. Convert it using "OZIP Decryptor" tools—but for safety, find a standard .zip file. oppo f3 nougat update file download top
OPPO maintains a flash tool called "ColorOS ROM Flash" for service centers. Advanced users can find the (flashable file) for the Qualcomm HS-USB QDLoader 9008 mode. This is the most "top" or complete file, as it restores the phone to 100% stock Nougat. Oppo F3 was released in 2017 with Android 6
Most top search results for "Oppo F3 Nougat Download" lead to a specific firmware version: . You will likely need to use the offline