The OPPO CPH1823, recognized as the OPPO F9 or F9 Pro, is a smartphone that received updates up to Android 10 with ColorOS 7. Users are advised to avoid third-party firmware download sites due to significant risks of malware or device bricking. For official, safe updates, visit the OPPO Support Page and use the system settings update feature. Oppo F9 Pro (CPH1823) | DeviceAtlas Oppo F9 Pro (CPH1823) | DeviceAtlas. DeviceAtlas OPPO Software Update : Step-by Step Guide