The device originally debuted with based on Android 9.0 Pie . Over its support lifecycle, it received significant updates:

Before you begin, you must gather your tools. Updating firmware is a delicate process that requires preparation to ensure your phone survives the transition.

ColorOS 11.1 (Android 11), providing features like FlexDrop and enhanced privacy controls. Methods for Installing Firmware

Firmware is the low-level software embedded in your phone’s hardware. For the Oppo A9 2020, the firmware includes the Android operating system (typically ColorOS based on Android 9 or 10), the kernel, drivers, and system partitions.

✅ Yes, over any buggy custom ROM. Would I buy the phone again for its firmware? ❌ No – the software support is too short for 2024+ standards.