The Indian version of the Galaxy S3 has just received an official Android 4.1.1 Jelly Bean update. The update is available via OTA and also with Samsung Kies (How to update using Kies). The official stock Jelly Bean update for India Galaxy S3 has the following description.
Product Code: GT-I9300RWDINU
Base Firmware: I9300XXDLK1(4.1.1)
Modem: I9300DDDLJ1
CSC: I9300ODDDLI7
Build Date: 08-11-2012
Changlist: 488302
If you want to manually update your Galaxy S III you can do it via Odin (How to install an official update with Odin).
You can download I9300XXDLK1_I9300ODDDLI7_INU.zip or I9300XXDLK1_I9300ODDDLI7_INS.zip.
The difference between INU and INS is that INU is the unbranded Indian ROM and INS is the branded ROM. Although India doesn't have network bonding so it doesn't make a difference what version you use. The Indian version of the Galaxy S3 has just received an official Android 4.1.1 Jelly Bean update. The update is available via OTA and also with Samsung Kies (How to update using Kies). The official stock Jelly Bean update for India Galaxy S3 has the following description.
Product Code: GT-I9300RWDINU
Base Firmware: I9300XXDLK1(4.1.1)
Modem: I9300DDDLJ1
CSC: I9300ODDDLI7
Build Date: 08-11-2012
Changlist: 488302
If you want to manually update your Galaxy S III you can do it via Odin (How to install an official update with Odin).
You can download I9300XXDLK1_I9300ODDDLI7_INU.zip or I9300XXDLK1_I9300ODDDLI7_INS.zip.
The difference between INU and INS is that INU is the unbranded Indian ROM and INS is the branded ROM. Although India doesn't have network bonding so it doesn't make a difference what version you use. 
What's my model number?
There are several ways to locate your model number:
- Option 1
- On your device, go to Settings, then "About device" and scroll down to "Model number"
- Option 2
- Often times you can view the model number inside the device, by removing the battery
- Option 3
- Using Samsung's model/serial number location tool