The Firehose programmer is not patched, or the wrong loader was used.
The following sections provide a comprehensive guide on the OPPO A3s CPH1803 firehose file
The Oppo A3s (CPH1803) is a popular budget smartphone, but like many Android devices, it can encounter software issues, bricking, or boot loops. When standard recovery methods fail, the via a Qualcomm Firehose Programmer file is the final solution for unbricking or flashing the firmware.