| Error Message | Cause | Solution | | :--- | :--- | :--- | | | Windows blocked unsigned drivers. | Reboot into Disable Driver Signature mode (see Part 3). Reinstall drivers via C:\Flashtool\drivers . | | "Device connected with debugging off" | USB Debugging not enabled. | On phone: Settings > Developer Options > Enable USB Debugging. (Tap Build Number 7 times to unlock Dev Options). | | "Processing of loader.sin finished with errors" | Corrupted FTF or USB 3.0 port conflict. | Move USB cable to a USB 2.0 port (black plastic inside). Re-download the FTF file. |