Samsung Galaxy S2 was released two years ago. It had some amazing features at the time of its launch – ultra-thin, a high quality rear camera, and HSPA+ Radio, the Galaxy S2 was a hit with consumers. It had a 1.20GHz ARM Cortex A9 processor, 1GB of RAM and 8 MP camera. When it was released, it came with Android 2.3 Gingerbread OS.
Galaxy S2 did not receive any official updates after Android 4.1. But you can update it to the latest Android 4.4.2 version using the SlimSaber custom ROM. This custom ROM offers a better battery life and optimized performance. You can follow the instructions given below to install it on Galaxy S2 i9100.