first download this file...
http://www.mediafire.com/?ynwgqtwzuzm
then rename it to update.zip.. make sure its not update.zip.zip if you dont see the .zip dont add it just rename it to update
then put it on the root (not in any folders)of your sd card
then power off your phone
then press x and the power button until you see a triangle with an ! in it
then press camera and vol+ until you see a menu
then use the dpad to select update.zip
done!