To flash the Oppo A3s (CPH1803) Go to product viewer dialog for this item.
A programmer file (often named prog_emmc_firehose_xxxx.mbn ) included in the firmware folder that allows QFIL to communicate with the phone's storage. General Flashing Procedure
Download the Qualcomm HS-USB QDLoader 9008 Driver to ensure your computer detects the device in EDL mode. 🛠️ Flashing Instructions
How to Firmware Restore your Qualcomm Lenovo phone with QFIL