How to install fastboot drivers for xperia devices on windows 8.1

This guide will help you to install fastboot and adb drives on Windows 8 / windows 8.1.

Step 1

Download and install flashtool

http://www.flashtool.net/downloads.php

Step 2 (install drives)

Press win+C key combination to bring charms menu

Then click on Settings

Click on change PC settings

Select Update and recovery

click on recovery

Then restart now under the advanced startup selection

When computer has rebooted click on troubleshoot

 Then advanced options

Startup settings

Restart

Once computer restarted press F7 for “Disable driver signature enforcement”

After that computer will reboot to desktop

Now you will be able to install fastboot drivers without any errors

Go to flashtool installation directory and run flashtool-drivers from drives folder (usually c:\flashtool\drivers)

Install drivers

And you’re done