Oppo implements stringent security measures on the R9sk. The bootloader is typically locked from the factory. MediaTek devices with locked bootloaders often restrict the flashing of the boot.img and recovery.img partitions via official tools.
Remember the golden rule: As long as you use a file explicitly labeled R9sk (not R9s ), and you follow the EDL flashing steps using MsmDownloadTool, you have an 95% chance of success. oppo r9sk global firmware
For the OPPO R9sk, which originally shipped with Android 6.0.1 and ColorOS 3.0, users primarily consider the global firmware for two main reasons: and Utility vs. Risk . Oppo implements stringent security measures on the R9sk
2. MSM Download Tool Throws "Unauthorized" or "No Device Found" Errors oppo r9sk global firmware