This usually happens on Windows 10 and 11 due to Driver Signature Enforcement. Restart your PC in "Disable Driver Signature Enforcement" mode, then reinstall the Flashtool drivers. "Processing of loader.sin finished with errors"
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Place your .ftf file in the firmware folder. This usually happens on Windows 10 and 11
Solution: Change the USB cable, switch from a USB 3.0 port to a USB 2.0 port, or clean the device charging port with isopropyl alcohol. This link or copies made by others cannot be deleted
Turn off your phone, hold the button, and connect it to the computer. Conclusion: A Legacy Tool
Uses hardened loader files (e.g., loader.sin or external .elf loaders) to establish communication with Qualcomm or MediaTek-based Sony devices in emergency download mode (EDL or Flash Mode). Version 09186 is known for stable handshaking with Xperia 1, 5, 10 series (SM8150, SM8250 chipsets).