FAQ
Q: Why do I need this?
[INFO]A: You can use this to completely remove evidence of rooting from your phone if you want to send it in for repair, or sell it. You can also use this is your phone has been infected by app-borne virus (I believe I just coined that term

).[/INFO]
Q: Will this wipe my phone of all data?
[INFO]A: Yes, this will wipe your phone completely and rewrite the partitions to a stock (the way you bought it) condition[/INFO].
Q: Will this wipe my SD card?
[INFO]A: NO, this will not wipe any data on your SD card, only system partitions of the phone itself. Unless you hit Master Clear (only on one-click), which there isn't really a need for.[/INFO]
Q: Does this void my warranty?
[INFO]A: No, in fact if you had a software change that would have have voided your warranty before this will bring you to a state that they will have never known an alteration was made [/INFO]
Q: I am currently running the latest software update, will this return me to this state?
[INFO]A: No, this will bring you back to Eclair 2.1.1 Firmware build JF6. BUT you will then be able to do an official Kies update to the latest released build.
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Q: Will i lose any apps or data during this process?
[INFO]A: You absolutely will, this is a full wipe of your system. But please refer to Post #2 where we will give you steps to take to back up your apps and data. Post #5 after you are done with the wipe and restore will give you the steps to restore the apps and data.
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Q: What is Odin?
[INFO]A: A Flashing program to download Kernels, firmware to Samsung mobile phones. Also used in recovering failed flashes, bricked phones or doing full system wipes and restores.[/INFO]
Preparations
1. Download and Install Samsung Drivers
Drivers
2. Go to Settings > Applications > Developement > Enable Debugging, then connect your phone to your PC, allow 2-3 minutes to configure drivers