Download KDZ and Drivers HERE
open kdz select downloaded firmware click normal flash
Put phone in download mode by pressing vol up home and power key
or turn off phone press vol up and vol down and plug cable
Now press START and RUN
Select Country and Language / Optional Clear Registry
Hit OK and just wait* (*don't close the program)
Phone will restart in Firmware Update and flash itself
best of luck no data lose just update firmware file which are broken during root or etc...
