Samsung Galaxy S3 I9300 was launched last year. It is one of Samsung’s best selling devices. It has a 4.8″ 720p display. It was also the first device to have a quad-core Exynos 4412 processor, with each core clocked at a maximum 1.4 GHz. It is equipped with 1GB of RAM.
The official Android 4.3 Jelly Bean firmware for the Galaxy S3 I9300 has been leaked. It has some of the features that are seen in the Galaxy S4 as well as the Galaxy Note 3. However KNOX is not integrated into this update. So if you want to update the the Galaxy S3 to Android 4.3, follow the instructions given below.