Galaxy Grand Duos is a typical mid range device with some impressive specs. It is powered by a 1.2 GHz Cortex-A9 processor, 8 GB of internal memory and 1 GB of RAM. Galaxy Grand consists of 8 MP primary camera and 2 MP secondary camera.
It currently runs on Android Jelly Bean OS. It can be upgraded to the latest Android 4.4.2 KitKat OS via the SlimKat custom ROMs. This ROM is still in the development stages but it can be used for day to day use. You can follow the instructions given below to install SlimKat ROM on Galaxy Grand Duos.