1. DOWNLOAD update.zip here: http://www.mediafire.com/?pd1dgeiwclxr1fz
2. Copy the downloaded file to your SD.(not inside any folder)
3. BOOT your device into RECOVERY MODE
(touch screen is disabled in recovery mode "to make a selection use VOLUME KEYs and use the HOME KEY in choosing a file or task")
4. Select "apply update from SD card" then choose update.zip
(wait until patch is completed) then your going back to the recovery menu.
5. Select "reboot system now".
To know if you successfully rooted your device go to the phone's main menu and if you have the application SUPERUSER your device is rooted.