RK Android Tool 2.71 requires (often DriverAssitant_v4.5 or similar). Without these, the PC will not detect the device in Mask ROM mode. The tool package sometimes includes drivers, but they should be installed separately before running the tool.
Right-click in the list to "Add Item" or "Load Config" if you have a parameter file. Rk Android Tool 2.71 Download
Flashing firmware can be risky. Follow these steps carefully to ensure a successful process: Step 1: Install Rockchip Drivers RK Android Tool 2