My Sony Z3 Compact is currently unusable and I would like to flash the Marshmallow version of FXP.

Unfortunately it seems like I can't find any fastboot (or as device manager calls it: S1Boot Fastboot) driver for Windows 10.

Am I looking somewhere wrong or is there simply no fastboot driver out there for Windows 10 yet?


  • Add your normal driver for Z3 Compat and then download fastboot files normally
    – DevUt
    Nov 18, 2015 at 8:59

2 Answers 2


By looking at the inf file, you can find that it tells to use the WinUSB driver. So there is a better solution than disabling driver signature enforcement, you can use the tool Zadig (http://zadig.akeo.ie/). This tools create a self-signed inf for this specific device, using ephemeral keys, added to the trusted certificate store (for this only device / inf), removing the need to disable signature check.

So you can do this :

  1. Download the tool, start it.
  2. Select the "S1Boot fastboot" device
  3. Select the WinUSB Driver
  4. Click Install

And then fastboot devices list your device.


I found the solution myself: Windows 10 somehow does not want to install the driver, as it can not verify the manufacturer. So the driver from Sony Developer's site works just fine. After deactivating the Windows driver signature check everything works fine.

To deactivate proceed like this: (taken from HERE)

  1. Press Win + X then U then Shift + R
  2. Once your Computer has rebooted you will need to choose the Troubleshoot option
  3. Then head into Advanced options
  4. Then Startup Settings
  5. Since we are modifying boot time configuration settings, you will need to restart your computer one last time
  6. Here you will be given a list of startup settings that you can change. The one we are looking for is “Disable driver signature enforcement”. To choose the setting, you will need to press the F7 key
  • It is not needed to restore again (IMHO) as when installing a mismatching signature driver it will show a red window advicing it, so you will realize that something wrong is going there.
    – lucasvc
    Aug 13, 2017 at 21:34
  • Here is a much easier way to install drivers manualy support.sonymobile.com/sa-en/xperiaxz/faq/… Feb 14, 2020 at 22:51

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