Installing the official Sony Xperia Companion often bundles these drivers automatically, though for legacy phones, the Flashtool method is more reliable. Common Troubleshooting
Select and "Fastboot Drivers" from the list.
Once downloaded, go to , right-click the "S1Boot" entry, select "Update Driver," and point the wizard to the folder containing the .inf files. Sony PC Companion : draiver dlia s1boot download skachat
You can find standalone S1Boot driver packages on developer forums like XDA Developers.
: If the device drops out of Flashmode after a few seconds, it is often due to a faulty USB cable or a USB 3.0 port incompatibility. Try a USB 2.0 port . Installing the official Sony Xperia Companion often bundles
When a Sony device is powered off and connected to a PC while holding a specific key (usually Volume Down for Flashmode or Volume Up for Fastboot), it enters a maintenance state. The PC identifies this hardware as or "S1 Service" . Without the specific driver, the device will appear with a yellow exclamation mark in the Device Manager, and flashing software will fail to "see" the phone. How to Obtain and Install the Driver Via Flashtool (Recommended) :
If you are on Windows 10 or 11, you must disable Driver Signature Enforcement before running the installer, or the drivers will fail to register. : Sony PC Companion : You can find standalone
: If the installation finishes but the driver still doesn't work, ensure you have disabled the "Digital Signature" check in Windows startup settings.