Download Rockchip Create Upgrade Disk Tool v1.46 (SD_Firmware_Tool._v1.46) from here, here or here. Download Rockchip Create Upgrade Disk Tool v1.4 from here.
BTW, if you need, you can download Rockchip Batch Tool v1.8 from here and Rockchip FactoryTool v5.0 from here.
If you need a tool like this for Allwinner devices then download PhoenixCard v3.1.0 from here.
Rockchip Create Upgrade Disk Tool v1.46 helps you to install firmware on Rockchip device from Micro SD card. You can write firmware image on Micro SD card and restore or update your Rockchip devices. Upgrade or restore any Rockchip device without computer or Flashing Tools. Before proceeding you have to make surethat you have right firmware. Wrong firmware will not boot up or may brick your device.