Oppo A9 2020 (CPH1937, CPH1938, CPH1941) was originally launched with ColorOS 6.1 (Android 9.0) and received its final official update to ColorOS 11.1 (Android 11)
Boot into recovery and select “Wipe data/factory reset.” Then reboot – the warning should disappear. Oppo A9 2020 Firmware
The device originally debuted with ColorOS 6.1 based on Android 9.0 Pie. Over its support lifecycle, it received significant updates: Oppo A9 2020 (CPH1937, CPH1938, CPH1941) was originally
RAM Management (8GB variant)
The 8GB RAM model handles 8–10 apps in memory without reloading. The 4GB variant still aggressively closes background apps – a known Oppo trait. Open SP Flash Tool as Administrator
Warning: Flashing firmware for the wrong model (e.g., CPH1939 firmware on a CPH1937 device) will hard-brick your phone.
If available, tap Download and Install. The phone will reboot to apply the changes. 2. Using Recovery Mode