How to Install Official 4.3 on the Samsung Galaxy S3 I9300

Good news for Samsung Galaxy S3 GT I9300 phone user. While most flagship Android devices are now getting the Android 4.4 update. Samsung on the other hand has finally managed to make the age old Android 4.3 Jellybean update available for the Samsung Galaxy S3 I9300. The new Android 4.3 update for the Galaxy S3 bring in a complete UI overhaul and a lot of new exciting features. The Android 4.3 update is now available all across the world through a OTA update. But if you prefer to manually install android updates on your phone, here is a how to guide to help you install the latest Android 4.3 update on the Galaxy S3. Now i will show you that how to install official Jelly Been 4.3 in your Samsung Galaxy S3 GT I9300. Just follow my instructions.

New features in Android 4.3 update for Samsung Galaxy S3:-
Galaxy Gear support
TRIM support (makes the device much faster)
Core UI elements updated to the one on Galaxy S4 (Galaxy S4′s theme all over)
New Samsung keyboard
GPU drivers have been updated (Higher GPU benchmark scores)
New Lockscreen: Multiple widgets, improved ripple effect than Android 4.1., ability to change clock size and set a personal message
New Screen modes (from Galaxy S4): Adapt Display and Professional Photo
Driving mode
Actionable notifications
Move-to-SD-card feature
New Additions in Notification Center
Completely revamped Settings UI (Tabbed interface-exactly like the Galaxy S4)
Implementation of Voice controls (Lets you control various parts of phone using voice commands-Galaxy S4 feature)
New Samsung Apps: Calculator, Clock, Contracts, Gallery, Music
Full screen Samsung app
New S-Voice (from Galaxy S4)

Solution:-
Files need to be downloaded:-
Password:- jabadbd24
Process:-
1. At first make sure that your phone is full charged
2. Create backup of your important files if necessary
3. Put the downloaded files in a folder in your computer and install USB driver
4. Enable USB dubugging in your phone. Now switch off your phone
5. Press and hold "Home button+power button+volume down button"
6. Press volume up button to enter into Download Mode
7. Now connect your phone with original data cable
8. Then open odin.exe in your computer
9. Wait until ID : COM section turns Yellow / Green
note: Make sure only the Auto reboot and F.Reset Time options are selected and leave other options unchecked
10. After that click on “PDA” to select the 4.3 update file (I9300XXUGMK6_I9300OXAGMK6_I9300XXUGMK6_HOME.tar.md5) which you downloaded in initial step
note: To get the above file please Extract the Android 4.3 zip file on your desktop
11. Click on “Start” to start the process
note: It will take approximately 15 minutes to update the device 
12. After the device is Updated, the phone will be rebooted automatically
13. Now use and enjoy

Finally, Problem solved!
Now you can Install official 4.3 in your Samsung Galaxy S3 easily
Congratulations!
If there any problem, don't hesitate to contact me