WARNING!
: There was never a global, stable OTA (Over-The-Air) update for Android 7 on the standard OPPO F3 in many regions, including India. However, an official Nougat update was released for the OPPO F3 Plus .
Since automatic updates may no longer reach the device, you can manually download the official OTA package from trusted OPPO firmware archives.
Background processes or old app data. Fix: Perform a factory reset (Settings → Additional Settings → Backup & Reset → Factory Data Reset). Backup first.
Insufficient storage or weak Wi-Fi. Fix: Free at least 3GB of internal space and use a 5GHz Wi-Fi connection.