Step 1: Download and Install Necessary Drivers (mirror link is better)
SAMSUNG USB Driver for Mobile - Phones v1.5.34.0.zip OR Mirror
Step 2: Download and Install Odin 3.04
Odin 3.07 OR Mirror
Step 3: On your Galaxy S3 got to Settings/Developer Options/USB Debuging -> check the box next to USB debugging -> say OK to security warning
Step 4: Turn your phone off
Step 5. Press Volume Down + Home (Center Button) + Power until the phone boots up to Warning screen
Step 6. Press Volume up once to enter download mode
Step 7. Open Odin3.04 by running as administrator and make sure all check boxes on in the Option section are unchecked except for Auto Reboot
Step 8. Plug your phone in to the USB cable and wait for the phone to be recognized by ODIN... When the phone is recognized the first rectangle under the Odin3 logo will turn yellow and show a com port
Step 9. Click on the PDA button and select your .tar file
Step 10. make sure no other boxes other than Auto-Reboot are checked and hit Start.
Step 11. Wait for the process to complete
MOST OF THE THINGS YOU WILL USE ODIN FOR (IE: ROMS & KERNELS) will use the PDA button - The Phone button is for Modems and Radios only and using it to flash anything else can and will brick your phone - In my time using ODIN I have never used Bootloader, CSC, UMS, or PIT files....
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