Oppo A9 2020 Coloros 12 Update ((free)) Page

OPPO has stated that the device's 2019 hardware (Snapdragon 665) is no longer sufficient to support regular major upgrades like ColorOS 12 while maintaining performance. How to Check Your Current Version

The short answer is that the Oppo A9 2020 has officially reached its end-of-life status for major Android OS upgrades. While it was a powerhouse upon release, hardware limitations and Oppo’s standard update policy mean it is not eligible for the official ColorOS 12 rollout. The Update Roadmap and Official Status oppo a9 2020 coloros 12 update