The Rockchip SD Firmware Tool is a tool that allows you to upgrade your Rockchip device / TV Box through the SD Card. You can easily create a bootable version of the firmware and then by simply restarting the device it will boot from your SD Card and the upgrade session will start. Inside the zip file you will find the SD_Firmware_Tool.exe and a Word Document with detailed instructions.
RKMC is a fork for Kodi and provides hardware acceleration and more features on Rockchip mainstream chips (rk3229, rk3229h, rk3288, rk3368, rk3399) and most android version (Android4.4, 5.x, 6.x, 7.x). In the case of hardware allowed, RKMC supports 4K2K, 4K2K 10bit(H264, HEVC) MVC 3D (bluray & mkv) high profile audio passthrough. It uses KODI 16.X Jarvis skin settings, so if you download a skin / build select the version for KODI 16.