Most likely, your phone will get stuck booting at the "glowing S logo". This is normal - it is because your phone has a mixture of the old and new firmware data.

To fix this, you need to Clear Data by accessing the Recovery Menu:

- Shutdown your phone and unplug it from the power or USB.
- Boot into Recovery Mode: Press and hold Volume-Up + Home + Power. You have to let go of the power button after about 3 seconds once you see the "Galaxy S" screen.

If you are successful, you will see the Recovery Menu.
Choose "Wipe Data / Factory Reset".
Reboot after it's done.

use this info at ur own risk

i think u have to use the odin method liao .... i hope u still can get into the download screen ...?
Press and hold Volume-Down + Home + Power at the same time.??