For users of the CPH1803 model—a Snapdragon 450-powered device originally running ColorOS 5.1—the QFIL flash file is the "master key." Because this model uses a Qualcomm chipset, the QFIL tool can communicate with the hardware at a low level (Qualcomm HS-USB QDLoader 9008 mode) to rewrite the entire operating system even when the phone won't turn on normally. Key Components for Recovery
Extract the downloaded Oppo A3S CPH1803 QFIL firmware package using WinRAR or 7-Zip to an easily accessible folder (e.g., C:\Oppo_A3s ). Step 2: Boot Oppo A3S into EDL Mode (9008)
A complete QFIL-compatible firmware package contains specific files required by the Qualcomm flash tool: oppo a3s qfil firmware cph1803 qfil flash file link
Navigate to your Windows Start Menu, search for , and launch the application as an Administrator.
The status bar will fill, and the log window will show the raw blocks being written to the device. For users of the CPH1803 model—a Snapdragon 450-powered
), you will need the specific stock ROM (OFT firmware) that includes the prog_emmc_firehose_8953_ddr.mbn (or similar) and XML files required by the tool. Oppo A3s (CPH1803) Flash File Details : CPH1803 (Oppo A3s) : Qualcomm Snapdragon 450 Android Version : 8.1 Oreo (ColorOS 5.1) Firmware Format : QFIL / Qualcomm (XML-based) Download Links & Resources Firmware Package
Once open, QFIL should automatically detect your device and display at the top. The status bar will fill, and the log
QFIL firmware for CPH1803 typically includes:
Follow these steps exactly. Deviating from the instructions can cause permanent hardware damage. Step 1: Install Drivers and Tools
The firmware for the OPPO A3s comes in a compressed (rar/zip) format. Below are the links for the official, latest versions that are compatible with the QFIL tool. CPH1803_11_A.47_191024_QFIL_Dump.zip Android Version: 8.1 (Oreo) / ColorOS 5.1 Chipset: Qualcomm Snapdragon 450 (SDM450) File Description Download Link OPPO A3s CPH1803 Latest QFIL Firmware Download Here Alternative/Older Version (A37) Download Here
Flashing firmware carries risks. Ensure you meet all requirements to prevent permanent damage to your device.