Sony provides driver packages for every Xperia model on their developer website.
If the automatic installation fails due to signature issues, a manual update is required.
“This is risky,” she warned. “S1Boot drivers bypass normal USB verification. Windows will fight you. You have to disable driver signature enforcement. Hold Shift while restarting your PC. Go into Advanced Startup. Trust me, or your phone stays a paperweight.” s1boot fastboot driver
You cannot use Google’s generic USB drivers or the standard Android ADB driver for S1Boot mode. Sony’s Fastboot implementation is proprietary. If you attempt to force-install a standard android_winusb.inf , Windows will reject it because the hardware signatures do not match.
The Ultimate Guide to the S1Boot Fastboot Driver: How to Install and Fix Connection Issues Sony provides driver packages for every Xperia model
If you use the popular "Flashtool" utility by Androxyde, it includes a comprehensive driver installer ( Flashtool-drivers.exe ) located in its installation directory.
This is a diagnostic protocol utilized to modify the flash filesystems via a USB connection. It starts before the main Android OS loads. “S1Boot drivers bypass normal USB verification
Connect the phone to a USB 2.0 port (the ones with black plastic inside, not blue). Alternatively, use an older USB 2.0 hub between your PC and the phone. 2. Waiting for Device Error in Command Prompt
The simplest way to get the correct S1Boot drivers is by installing Sony's official desktop software.