A new update, XXEMG4, with Android 4.1.2 was released for Samsung Galaxy S III GT-I9300 in Ukraine. Update XXEMG4 should be available in Kies if you live in Ukraine or through OTA.
If you want to manually update Samsung Galaxy S III GT-I9300 to latest Android 4.1.2 XXEMG4 you can do so using Odin.
: Android 4.1.2
Our recommendation is to wait for the official XXEMG4 update. If you choose to update your Samsung Galaxy S III GT-I9300 using Odin, you have to do it on your own risk.
Install Android 4.1.2 XXEMG4 on Samsung Galaxy S III GT-I9300 using Odin
- First, download I9300XXEMG4_I9300OXEEMH1_RTL.zip
- Download Odin v3.07
- Continue the installation by following the steps here: How to manually install update XXEMG4 Android 4.1.2 on Samsung Galaxy S III GT-I9300 using Odin.