Standard USB drivers (Media Transfer Protocol) allow you to move photos and files, but they do not allow system-level commands.
When you connect a Sony phone to a PC while in (usually achieved by holding the Volume Up button while plugging in the USB cable while the phone is off), the computer identifies the device as "S1Boot Fastboot." Windows does not natively include drivers for this specific diagnostic mode, which is why you must install them manually. s1boot fastboot driver
is the proprietary primary bootloader used by Sony Mobile Communications (formerly Sony Ericsson) on their Xperia line of smartphones. It is the very first piece of code that runs when you press the power button. Its job is to load the secondary bootloader (ABOOT) or Fastboot interface. Standard USB drivers (Media Transfer Protocol) allow you
: On newer versions of Windows, you may need to restart your PC in Advanced Startup mode and choose "Disable driver signature enforcement" before the OS will allow you to install these older, unsigned drivers. It is the very first piece of code
Microsoft’s driver signature enforcement blocks unofficial drivers. The S1Boot driver is signed, but older versions often cause issues. To be safe: