If your Oppo A9 2020 continues to malfunction even after flashing the latest firmware, the issue may be hardware-related (eMMC storage failure or motherboard damage). At that point, visit an authorized Oppo service center.
I can provide the targeted file links and tools for your scenario. Oppo A9 2020 Firmware
If you need a specific firmware file (e.g., CPH1937EX_11_C.65), let me know your exact model and current build number, and I can guide you to a safe source or extraction method. If your Oppo A9 2020 continues to malfunction
: Officially discontinued; the hardware can no longer support newer regular upgrades or maintenance. Oppo A9 2020 Firmware