Update Galaxy S3 to Android 4.3 I9300XXUGNA8 Jelly Bean Official Firmware [GUIDE]

Samsung is rolling out the latest Jelly Bean update with build number I9300XXUGNA8 for the international variant of Galaxy S3 (GT-I9300), starting with Uzbekistan. As the firmware is being rolled out in phases, it may take some time before it is available in your country or region.