[AYUDA] Xperia U ST25i no deja flashearse.!

Este error me da cuando intento flashear:

27/055/2014 13:55:40 - INFO - <- This level is successfully initialized
27/055/2014 13:55:40 - INFO - Flashtool Version 0.6.9.1 built on 2012-04-09 19:22:19
27/055/2014 13:55:40 - INFO - You can drag and drop ftf files here to start flashing them
27/055/2014 13:55:49 - INFO - Device disconnected
27/055/2014 13:55:52 - INFO - Selected ST25i_6.1.1.B.1.10_Sony-Spain.ftf
27/055/2014 13:55:52 - INFO - Preparing files for flashing
27/056/2014 13:56:34 - INFO - Please connect your device into flashmode.
27/056/2014 13:56:40 - INFO - Device connected in flash mode
27/056/2014 13:56:40 - INFO - Opening device for R/W
27/056/2014 13:56:40 - INFO - Reading device information
27/056/2014 13:56:40 - INFO - Phone ready for flashmode operations.
27/056/2014 13:56:40 - INFO - Start Flashing
27/056/2014 13:56:40 - INFO - Flashing loader
27/056/2014 13:56:41 - INFO - Loader : null - Version : R5E006 / Bootloader status : ROOTABLE
27/056/2014 13:56:41 - INFO - Flashing kernel.sin
27/056/2014 13:56:43 - INFO - Flashing fotakernel.sin
27/056/2014 13:56:45 - INFO - Flashing modemfs.sin
27/056/2014 13:56:45 - INFO - Flashing partition-image.sin
27/056/2014 13:56:46 - INFO - Ending flash session
27/056/2014 13:56:46 - ERROR - ERR_SEVERITY="MAJOR";ERR_CODE="0076";ERR_DYNAMIC="failed to set ta config";�
27/056/2014 13:56:46 - ERROR - Error flashing. Aborted
27/056/2014 13:56:46 - INFO - Device connected in flash mode
27/056/2014 13:56:47 - INFO - Device disconnected

Los driver tiran error al instalarse, tengo W8. Espero me ayuden amigos.!!