If you are experiencing issues that make you want to update, you can test your hardware using these built-in codes: : Check WiFi chipset parameters. : Check PCB serial number and hardware revision. backup your data before attempting a manual firmware flash? OPPO Software Update : Step-by Step Guide
Many users confuse Android version with ColorOS version. ColorOS 5.0 (based on Android 8.1) rolled out to the Oppo F7 and Find X, but never to the F3 series. The last official firmware for the Oppo F3 remains: Oppo F3 Update 8.0 Download
The official update does not exist. Unofficial custom ROMs are fun for tinkerers, but for a daily driver, they introduce too many risks (camera bugs, battery drain, VoLTE issues). If you are experiencing issues that make you