Before commencing:

See, if the S3 is an international variant. The model number should be GT –I9300 Ensure battery is 80% Have a backup of the data with custom recovery instrument such as ClockWorkMod Enable USB debugging

Updating Galaxy S3 to Official Android 4.3 Jelly Bean (XXUEML8) 10.Choose the Odin start button and proceed with installation. After installation, phone will restart

Launch Android 4 3 Jelly Bean Update XUEML8 on GS3 - 5Launch Android 4 3 Jelly Bean Update XUEML8 on GS3 - 32Launch Android 4 3 Jelly Bean Update XUEML8 on GS3 - 87Launch Android 4 3 Jelly Bean Update XUEML8 on GS3 - 72Launch Android 4 3 Jelly Bean Update XUEML8 on GS3 - 74