Here Is Sony Smart Phone Software Update Tutorial 1 install flash tool 2 go ''c drive '' flash tool 3 select driver and install it only flash mode driver 4 then copy firmware and paste here '' C:\Users\your pc name\.flashTool\firmware'' 4 open flash tool Now Wait Few Minuit 5 switch off mobile 6 press volume down and insert usb cable 7 if you fail first try' don't worry try again