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.
Firmware details:PDA: I9300XXEMG4
Version: 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
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