Just make sure you have the latest version of Kies installed on your PC. I would also recommend you to uninstall existing Kies software from your PC before installing the newly downloaded version, to avoid any problems while upgrading.
Here is a tweet from @SamKiesUpdates showing the firmware details of the Indian I9003 update,
The build date of the I9003DDKP3 - Indian Gingerbread firmware is 28-10-2011.
- PDA: I9003XWKPG
- Phone: I9003DDKP3
- CSC: I9003ODDKPG (INU)