[Galaxy S III General] jhon101:
The JB update just started rolling out in India a few days back and this method helps you update your Galaxy S3 to the official JB release using Kies(Easiest and the safest way) Though people over at this thread ( http://xdaforums.com/showthread.php?p=33921598#post33921598 ) do say the servers are sometimes down and I personally think this was take a LOT of time.

Also, This should work in India, GS3 owners in other countries(GLOBAL + US VERSIONS) can give this a try to check whether they have the update or not. No harm done either ways.

I'd like to thank jshashwat93 for this method as I saw his post on the aforementioned thread and that's how I got my update.

NOTE: This method is pretty safe until you don't remove the phone from your computer while it's updating in Download mode. So if you do somehow manage to screw up your Device,

I AM NOT RESPONSIBLE

Here's how it goes:

1. Disconnect your phone from the computer, if you have it connected and start Kies.

2. Click on Help->Check for updates. This Updates Kies. It's required for Updating the Firmware of your phone.

3. After this is done, you might want to restart Kies, and from here on, we shall get to the Update process.

4. Go to Tools->Firmware Upgrade and Installation.

5. It should ask for your Model No. Enter: "GT-I9300".

6. Now it should ask for your Serial No. as Shown in the 2nd picture attached.

7. Now power off your phone and remove the back cover and then the battery.

8. The battery compartment has the IMEI number and the serial number near the Barcode. You require the Serial number.

9. The serial number is written as "S/N: XXXXXXXXX". That's an 11 character number. Write the "XXXXXXXXXXX" in the Serial Number field in the Kies pop up. (Do not write the 'S/N:/ Part)

10. Non Indian users, this is the step that makes it or breaks it for you, the next screen shows you whether or not there is an update for you and from here on, the software will download some files(Shouldn't take long)

11. After a few agreements, you should see the software now asking you to attach your phone in Download mode.

12, Make sure your phone has at least 80% battery because I am not sure whether the battery is charged in Download mode or not. And this step might take a while. The phone, from here, SHOT NOT BE DISCONNECTED or you will spoil your phone(Brick i even. Don't know the consequences)

13. By now you must havee seen that all settings and apps will be erased(In one of the agreements) so it's better to back up your data. ALTHOUGH, here's the interesting part, after my update, I saw all the apps and EVERYTHING was carried forward as it is so cheers to SAMSUNG for that.

14. ALright, Power off your device and press and hold the VOLUME DOWN+HOME BUTTON+POWER BUTTON to enter the download mode.

15. The phone should now display a warning(Check image). Press the volume up button to Continue.

16. You are now in download mode.

17. Connect your phone to your computer and start the installation(The onscreen instructions will guide you. I couldn't post screenshots because I have already updated my phone. Sorry)

18. Sit back and relax this may take a while I left it overnight and slept like a baby(LOL). Though make sure, YOU DO NOT DISCONNECT YOUR PHONE

19. You should have Jelly Bean after the update is done. No need to restart or anything as for me, it was already rebooted. And all my apps were carried here. Works absolutely perfectly. CHEERS Samsung

NOTE: This does not void the Warranty because it's been updated through Kies. So if something DOES go wrong, and you can't find a way to solve it on XDA, you can always get it repaired. Still, Don't blame me if the guy won't repair your phone.

Have fun with your new Update. Cheers

If I helped in anyway, Which I hope I did, HIT THE THANKS BUTTON INSTEAD OF JUST SAYING IT!!!!!!