2.Remove the SD Card.
3.Download this file down here and extract anywhere on your PC.
---This will take you to 4shared.com, so when you go to this website, right-click on download and press open in new tab it will get downloaded.
8.After this Run the KDZ_FW_UPD.exe from the extracted folder.
9. Choose Type: 3GQCT and Phone Mod: DIAG.
10. Now Browse the firmware you downloaded.
11.Click ''LAUNCH SOFTWARE UPDATE''.
12.Wait till the procedure was successful and the phone will reboot. It will take around 10-15 MINS.
[NOTE: To put your phone on downloading mode, switch off your phone and press POWER+HOME KEY+VOLUME UP]
-------IF ANY PROBLEM PLS COMMENT-------