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Download and Install Stock ROM On Oppo A3S CPH1803EX Official Firmware. Home Oppo Oppo A3S CPH1803 Firmware Flash File Here you can download official OFP Stock Firmware for the Oppo CPH1803 Android device. Download Oppo A3s Cph1803 Stock Firmware Rom Flash File Firmware Box Software Rom Next you can download to your machine the Oppo A3s CPH1853 program and install the Oppo A3s CPH1853 Firmware Flash File. Firmware oppo a3s . Weak skills on Ram. All you need to know is to backup the data in internal memory. 2- Out of the icon appearing Double click on MSM Download Tool. 232337 shows bluetooth device address in oppo a3s gsm codes for oppo a3s change pin code 04. 4- Then it will verify for PC Memory Checksum. The stock firmware is based on Android 80 Oreo. OPPO A15s CPH2179 Realme GT RMX2202 Vivo V21 PD2083F OPPO A3s CPH1803 Vivo V1 PD1502F Realme X50m 5G RMX2141 OPPO A37 A37fEX Leave a Comment X. You may also like. The stock firmware file name is CPH1803EX_11_A03_18...