Flashtool 0.6.6 Windows Fixed Online

Yes, but you must disable driver signature enforcement and run as administrator. The flashing process itself works perfectly.

: Added the ability to drag .ftf bundles directly into the interface for easier loading. Flashtool 0.6.6 Windows

This is the most critical step. Windows 10/11 default drivers often do not recognize the "Flashmode" or "Fastboot" state of legacy Xperia phones. You will likely need to install the package. This package includes: Yes, but you must disable driver signature enforcement

Place the FTF file inside C:\Flashtool\firmwares\ folder. press Shift + Restart

: On Windows 10/11, you may need to disable driver signature enforcement temporarily. Reboot your PC, press Shift + Restart , go to Troubleshoot > Advanced Options > Startup Settings > Restart , then press 7 for "Disable driver signature enforcement."