Use the dropdown menu to find your specific model number (e.g., SGH-E250). Selecting the wrong model can result in a "bricked" device.

Open the executable file. If you are using the Z3X shell, select "Samsung Tool" from the menu.

Watch the log window at the bottom. Do not disconnect the cable until the software displays "Operation Successful." Important Safety Warning

Reading, writing, and repairing the EEPROM data which stores critical calibration settings.

While some "cracked" versions exist, the most stable performance requires a physical Z3X Box hardware interface.