Windows security may block these drivers by default. You must temporarily disable signature checks: Go to . Click Restart now under Advanced startup .

For a reliable download, you can find the Flashtool Xperia Driver Pack on verified third-party repositories or through official Sony developer channels where the main tool is hosted.

: Ensure you are using a high-quality USB cable. When connecting for flashing, power off the phone and hold the Volume Down button while plugging it in to enter Flashmode.