Download and install the latest Qualcomm HS-USB QDLoader 9008 drivers on your Windows PC.
The R9sk operates on the MediaTek Helio P10 platform. Unlike Qualcomm devices which utilize the EDL (Emergency Download) mode for low-level flashing, MediaTek devices utilize the SP Flash Tool protocol, communicating via the Preloader and Little Kernel (LK) partitions. oppo r9sk global firmware
Flashing firmware is a risky procedure. Ensure you have the following before starting: Download and install the latest Qualcomm HS-USB QDLoader