Download and Update Android 4.1.2 I9300XXELL4 Firmware For Galaxy S3

Samsung start rolling out the latest Android 4.1.2 firmware for Galaxy S3 GTi9300 users. Poland is the first country that receive and available update to  this Galaxy S3 Android 4.1.2 firmware. Now, the galaxy S3 users from Austria, Belgium, France, Germany, Hungary, Italy, Spain, United Kingdom also receive the Android 4.1.2 firmware. Here is the latest firmware info:

PDA: I9300XXELL4
CSC: I9300OXEELL1
Version: 4.1.2
Date: 2012-12-12
Regions: Austria, Belgium, France, Germany, Hungary, Italy, Spain, United Kingdom

You can update the firmware via OTA update or use Samsung Kies application. Do you already receive the firmware update notification? You can go to your phone setting>About device> Software Update> Update to check either the firmware is reach your region or not.  If your Galaxy S3 was rooted the you might unable received the updated notification. So, you can temporary unroot (How To) your Galaxy S3 and then you can update to the latest and official Android 4.1.2 firmware. In other hand, if your phones is running custom ROM then you need manually download the firmware and flash into your Galaxy S3 via Odin. Here is the tutorial on how to download and flash Android 4.1.2 I9300XXELL4 into international Galaxy S3 GTi9300:
Note: Flash or modified Galaxy S3 firmware will void the phone warranty. Method below is only for your reference and only for the international Galaxy S3 GTi9300. Try it on your own risk.
Step 1. You need Samsung Diver to enable your PC able detect and connect to your Galaxy S3. So you can Download Samsung Galaxy Driver (Link) or Downloadand install Samsung Kies on your PC. Restart your PC after installation complete.
Step 2. Download (Link)  the Galaxy S3 firmware (I9300XXELL4_I9300OXEELL1_SER.zip .zip) and then Extract the file  and now you will get ( I9300XXELL4_I9300OXEELL1_SER.zip .tar file).
Step 3.Go Setting >Developers option to enable USB Debugging on your Galaxy S3and then Power off your  Galaxy Note 2.
Step 4.Press your Galaxy volume Down+ Power Button + Home Button to enter Downloading Mode.
Step 5.  Open Odin (download Link) on PC, then connect your Galaxy S3 to PC via USB connect USB.
Step 6.  Make sure Odin Detect your Galaxy S3 (How to know).
Step 7.  Press Odin PDA, then select the  downloaded firmware (I9300XXELL4_I9300OXEELL1_SER.zip .tar).
Step 8.Now click Odin Start button  to Flash the firmware into your galaxy S3. Don’t unplug Galaxy S3 connection from computer during the process flashing Android 4.1.2 firmware.
Step 9.That all! Your Phone will reboot once the firmware complete flash into your Galaxy S3.
That’s all Enjoys!