Once connected properly, the MSM Download Tool will automatically detect the device on its corresponding COM port.

Click the button located at the top right of the tool window.

While holding the buttons, connect the phone to your computer via the USB cable.

Use a high-quality or original USB cable for a stable connection. PC/Laptop: A Windows computer is required to run the flashing tools. Required Tools and Files To flash the , you typically need the following: Official Flash File:

To successfully flash the Oppo A3s CPH1803, you need the following components:

Flashing a device can void the warranty and may cause damage if not done correctly. Proceed at your own risk, and ensure you have a backup of your important data.

Look at the MSM Download Tool interface; the device status should change to . Click the Start button in the top right corner of the tool.

The safest location is the official OPPO support website. For the CPH1803, OPPO Malaysia provides a direct download page listing all official versions. The latest build listed includes , released in February 2021, which includes the January 2021 Android security patch. Other versions available range from A.18 to A.34.

Oppo A3s Cph1803 Flash File -