How to upgrade Samsung Galaxy S3 to Android 4.2.2

It's been a while since the official Jelly Bean 4.2.2 leaked for the Samsung Galaxy SIII and now I'd like to tell you how to upgrade your S3 to the latest official Android version.

What you need:
1. Odin (included in the download package below).
2. The official ROM.

How to upgrade:
1. Download both Odin and the ROM.
2. Boot your phone into download mode. (You can do this by holding Volume down, Home and Power keys till it takes you to download mode).
3. Select Continue.
4. Connect your phone to your PC.
5. Let all drivers install automatically. This will not work till all drivers are installed automatically.
6. Open Odin.
7. Add I9300XXUFME3_I9300OJKFME1_HOME.tar.md5 to PDA
8. Make sure re-partition is NOT ticked
9. Start flash, sit back and wait a few minutes.
10. It will boot automatically and you're good to go!