[HELP] D2303 Bricked topic

Hi to all,
i tried to flash a firmware version downloaded from xperifirm and then builded by flashtool the ftf.
while it was flashing got some error:
28/009/2014 17:09:36 - INFO - Checking header
28/009/2014 17:09:36 - INFO - Flashing data
28/009/2014 17:09:40 - ERROR - Processing of modem.sin finished with errors.
28/009/2014 17:09:40 - INFO - Ending flash session
28/009/2014 17:09:40 - ERROR - 31 : Un dispositivo collegato al sistema non è in funzione.
28/009/2014 17:09:40 - ERROR - Error flashing. Aborted
28/009/2014 17:09:41 - INFO - Device disconnected


Now my phone is turned on but grey...i can't flash or doing anything...please help me!!