A heavily stripped-down, optimized version of the official Samsung KitKat firmware.
Most SM-T210 custom ROMs take the first approach: they are built on Samsung’s source (released under GPL) but rely on the proprietary galcore.ko module for GPU acceleration. Without proper GPU drivers, any Android version beyond KitKat would boot but render software-only graphics—an unusable slideshow. This technical constraint explains why Android 5.1 Lollipop remains the practical ceiling for this device, despite experimental builds of Android 6.0 or 7.1 existing. samsung galaxy tab 3 smt210 custom rom