In this article we will be recommending you to go through the following two videos which gives you detailed information on how to complete the Samsung Galaxy S Flashing Firmware.
To get started you will have to beging with the Downloading and Installation of the Samsung Kies Software from this website, which will make sure that the device drivers are all installed on your computer.
Next you will have to download a few files which are the firmware and flash tools.
Odin3 and Pit file – http://www.multiupload.com/2KS7YR7UXG
Initially you will have to first make sure that you have taken a backup of data by Sync Contacts in Samsung Galaxy S before you Upgrade Firmware Samsung Galaxy S.
Watch the below videos for detailed instructions :