Fix: Oppo rolls updates in phases. Force check manually:
Still nothing? Clear the update app data: oppo f3 nougat 711 official update download fix
If nothing works, download the full official firmware package (CPH1609EX_11_A.XX_2017XXXX) and flash it via Recovery Mode: Fix: Oppo rolls updates in phases
Fix: This usually means corrupt cache or low storage. Still nothing