1. Choose correct flash file(s).
2. If you have PIT file chosen, then you must check "Repartition" option.
4. Check flashing options if needed (Repartition, EFS clear, Boot update).
5. Power on phone in download mode (turn off phone, press vol.down + home + power).
6. Connect phone to PC with USB cable, install drivers if needed.
7. Press "Flash" button.