Double-check that all paths are correctly configured and the device remains listed as QDLoader 9008.
The "Oppo R9s Plus Firmware Qfil" refers to the official stock software designed for the Oppo R9s Plus Go to product viewer dialog for this item.
Ensure the smartphone battery is charged to at least 50% to prevent the device from turning off mid-process.
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