You need version 2.7.496 or higher. Inside QPST is the QFIL executable.
: High. Interruption during the QFIL flashing process can permanently brick the device. It is critical to use the exact firmware for the CPH1611 model to avoid flashing failures. Flash Tool Requirements Oppo R9s Plus Firmware Qfil
If your Oppo R9s Plus (CPH1611) is stuck on the boot logo, suffering from persistent lag, or has become a "brick" after a failed update, flashing the official firmware via the Qualcomm Flash Image Loader (QFIL) is often the ultimate fix You need version 2