3)create a folder "dload" off course without the quotes on to the root of your SD card.
3) Extract the UPDATE.APP from the stock ROM and place it in "dload"
4) Power off your phone with sd card inside.
5)Power on by pressing POWER+RED BUTTON+VOLUME UP Button if done properly you will see progress bar saying UPDATING!
after its done it will reboot automatically and YOUR phone good as NEW