Android 3.0 was a milestone release specifically designed for tablets. It introduced the "Holographic" user interface and features like: Redesigned System Bar for notifications Action Bar for application control Five customizable home screens Improved multitasking with a Recent Apps list Why Seek Version 3.1.3.0?
The specific file version usually refers to a specific application build rather than the operating system itself. In the Android ecosystem, version numbers are critical. Download APK File -Android 3.0- v3.1.3.0