Download the file from a trusted source. Extract the file using tools like WinRAR or 7-Zip. Run the installer and follow the on-screen instructions.
During or after installation, run the Driver installation executable located in C:\Flashtool\drivers (usually Flashtool-drivers.exe ). Select "Flashmode Drivers" and "Fastboot Drivers" for your model.
: Unlock or relock Xperia bootloaders safely.