It will flash a stock boot image back to your device.
1. Extract Odin files to a folder from the attachment.
How to get into Download Mode (For Odin)
1. Unplug the USB cable.
2. Shut down the phone.
3. Hold down the 'HOME' + 'VOLUME DOWN' buttons and press the 'POWER' button for about 2 seconds until a WARNING! Screen appears. Press the 'VOLUME UP' button to enter Download Mode.
2. Tick 'Auto Reboot' and 'F. Reset Time' in Odin and nothing else.
3. Download the boot image and load into Odin as a PDA.
4. Click on Start to flash the image.
DO NOT UNZIP THE BOOT TAR FILE, FLASH IT AS IT IS.