This is a quick way to reset the device through the hidden service menu. (dialler). Dial the code: *#*#7378423#*#* In the menu that appears, select Customization Settings Reset Customization and confirm by selecting Reset device
Confirm the selection by pressing the , then choose Yes to begin the formatting process. Method 3: PC Companion Software Hard Reset SONY Xperia J ST26i How to Hard Reset SONY Xperia J ST26i