You can nowflash XXUGNG3 Android 4.3 on Galaxy S3 I9300 which is the latest official JB update for the S3. While you may be waiting for the KitKat to beautify your smartphone, it has become a very unlikely update to expect from Sammy. However, you can update the Android 4.4 KitKat latest firmware using various custom firmwares that are both stable and provide amazing performance. Here are some:

How to Update Galaxy S3 i9300 to Android 4.4.4 with C-RoMUpdate Galaxy S3 i9300 to Android 4.4.4 CM11 M8 Custom ROM – How toUpdate Galaxy S3 I9300 to Android 4.4.2 Fusion-SP Custom ROM – How toUpdate Galaxy S3 I9300 to Android 4.4.2 Revolutionary S5 Custom ROM – How to

Here is the official JB update to flash on your Samsung Galaxy S3 I9300.

XXUGNG3 Android 4.3 Jelly Bean details:

Model:GT-I9300

Model name:GALAXY S III

Country:Germany

Version:Android 4.3

Changelist:2713958

Build date:Wed, 16 Jul 2014 08:28:54 +0000

Product Code:DBT

PDA:I9300XXUGNG3

CSC:I9300DBTGNG2

MODEM:I9300XXUGNA8

Follow this detailed guide to flash XXUGNG3 Android 4.3 on Galaxy S3 I9300. Once you have updated, here is how toroot: Root XXUGNG3 Android 4.3 Jelly Bean on Galaxy S3 I9300 – How to

Prerequisites to flash XXUGNG3 Android 4.3 on Galaxy S3 I9300:

Please check these prerequisites before going forward to theupdate guide.

Downloadand install USB drivers for Galaxy S3 in your computer.Make sure to takebackupof any important files on your smartphone.Enable USB debuggingoption by pressingMenu>Settings>Applications. Navigateand tap onDeveloper Optionsto ensure thatUSB Debuggingis enabled.Ensure that your Samsung Galaxy S3 I9300 carries more than 70% of charge.

Stepsto flash XXUGNG3 Android 4.3 on Galaxy S3 I9300:

Required files:download I9300XXUGNG3forGalaxy S3fromhere.Also, download theOdin3 v3.09 for installation fromhere.

Here are the steps to flash XXUGNG3 Android 4.3 on Galaxy S3 I9300 official firmware:

Unzip Odin on your computer and install it.Unzip firmware zip file in the same folder as Odin.Switch yourSamsung Galaxy S3 off and boot it inDownloadmode: press and holdVolume Down, PowerandHomebuttons together.Connect your smartphonewith computer. When connected successfully, you will get a message in Odin sayingAdded!!.(In case you don’t get it, try another USB port. If that doesn't help either, then re-install USB drivers).On your Odin, select files:lick onAP/PDAand select file withCODEin its name.Click onCP/Phoneand select file withMODEMin its name -ignore if you didn't get any such file.Click onCSCand select file withCSCin its name -ignore if you didn't get any such file.Click onPITand select the.pitfile -ignore if you didn't get any such file.Make sure to checkAuto RebootandF.Rest Time. CheckRe-Partitiononly if you selected the.pitfile.Click onStartto initiate the update process.When Android 4.3 JB update installation is successfully completed, you will get aPASSmessage.Once you see the home screen, you can disconnect yourSamsung Galaxy S3and reboot it.