If you are compiling custom firmware or flashing individual components like a custom recovery: Stay on the default tab.
Setting up the tool itself is straightforward. Rkdevtool V2.71 Download
Rkdevtool is proprietary software owned by Rockchip Electronics. Downloading and using it falls under fair use for device repair and development. However: If you are compiling custom firmware or flashing
: You must install the Rockchip USB Driver Assistant (typically version 5.1.1 or similar) first so your PC recognizes the device in flashing mode. Rkdevtool V2.71 Download
: Supports writing official or third-party image files directly to eMMC or NAND flash.