RK8 android TV stock firmware is available for download. This android TV comes with 2GB of memory, 8GB of flash NAND storage, dual band WiFi AP6330 radio and Bluetooth 4.0. For connectivity, you get an SD card reader, a pair of USB 2.0 ports, HDMI 2.0 connector, network port 10/100, A / V output and SPDIF digital audio connector. It runs android 5.1.1 lollipop operating system and package includes an IR remote control as well. Find RK8 specifications here.
You can download RK8 stock ROM from here and then flash it using instructions given for CR18 android TV.
You can use this to bring RK8 android tv to stock settings and for doing factory reset which will delete any and every single bit of data stored on it. This is useful if you are not able to get rid of a teething problem.