The "RKDevTool No Devices Found" error is a common headache when flashing firmware onto Rockchip-based devices like Single Board Computers (SBCs), Android TV boxes, and retro gaming handhelds. This error means the Rockchip Development Tool (RKDevTool) cannot communicate with your device over USB.
To isolate whether the issue lies within RKDevTool itself or your Windows operating system, check the Windows Device Manager. Press Win + X and select . Look through the list for your device: rkdevtool no devices found
You can also use the tab → “Enter MaskROM” if the device is already detected elsewhere. The "RKDevTool No Devices Found" error is a