This resets everything and bring your phone to state when you first purchased it! PLEASE BACKUP EVERY SENSITIVE DATA AS YOU WILL LOOSE EVERYTHING YOU HAVE ON PHONE!
1)Download a stock ROM from link at the bottom
2) Format your SD card in FAT32(NO NEED TO FORMATE IF ITS ALREADY FAT32)
3)create a folder "dload" off course without the quotes on to the root of your SD card.
4) Extract the UPDATE.APP from the stock ROM and place it in "dload"
5) Power off your phone with sd card inside.
6)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!!!!!
OFFICIAL XDA LINK