Yes, if you own the device and are repairing it. Distributing firmware may violate copyright, but using it for personal repair is generally considered fair use.
suffix for global/Indonesian regions) can be found through repositories like evilicastel.com links provided by technical guides. Qualcomm Driver : Ensure the Qualcomm HS-USB QDLoader 9008 oppo a3s qfil firmware cph1803 qfil flash file link
You're looking for the QFIL firmware flash file for the Oppo A3s (CPH1803). Here are some details: Yes, if you own the device and are repairing it
For a bricked OPPO A3S, start with the oldest Android 8.1 version (A.31) via QFIL. Once revived, you can OTA update to newer versions. oppo a3s qfil firmware cph1803 qfil flash file link