The device officially reached ColorOS 11.1 (Android 11) . For most users, staying on the latest official firmware is the only stable path for security and app compatibility. 3. Risks of Flashing

: If your goal is better speed, official software updates (up to ColorOS 11.1/Android 11) are available, though OPPO has officially discontinued support for further major upgrades due to hardware limitations. Developer Options Setup

The Oppo A9 2020 has a MediaTek Helio P35 chipset and a locked bootloader by default. Oppo does not officially provide bootloader unlock codes. This makes custom ROM work extremely difficult, risky, and often not worthwhile.

Are or mobile gaming performance your main priority?

I can provide specific ROM recommendations or detailed troubleshooting steps based on your current setup. Share public link

It provides a lightweight, clean environment that drastically speeds up app launching compared to stock ColorOS.

The only semi-reliable method (as of 2025-2026):

If you are determined to modify your device, here is the current state of "what works" and what doesn't: Since the

The (CPH1937/CPH1939) is notoriously difficult for custom ROM development due to Oppo's strict policies on unlocking the bootloader. While it features a capable Snapdragon 665 chipset, official support ended at Android 11 (ColorOS 11.1) , and the device is now permanently discontinued. Custom ROM Landscape

Q: Can I install a custom ROM on Oppo A9 2020 without unlocking the bootloader? A: No, unlocking the bootloader is a prerequisite for installing a custom ROM on Oppo A9 2020.

Once your bootloader is unlocked and TWRP is installed, the flashing process generally follows these steps:

Dedicated ROMs are generally not available.

Remember to research and choose a reputable custom ROM, follow the installation guide carefully, and always backup your data to prevent loss. Happy ROM-ing!

Without an unlocked bootloader, you cannot flash custom recoveries (like TWRP) or custom ROMs.