Lo he intentado pero no he podido, siempre me pone error.
esto es lo que pone:
02/038/2013 21:38:44 - INFO - <- This level is successfully initialized
02/038/2013 21:38:44 - INFO - Flashtool Version 0.9.10.1 built on 2013-01-09 19:49:47
02/038/2013 21:38:44 - INFO - You can drag and drop ftf files here to start flashing them
02/038/2013 21:38:49 - INFO - Device disconnected
02/039/2013 21:39:10 - INFO - Device connected in flash mode
02/039/2013 21:39:25 - INFO - Selected LT15a_4.0.2.A.0.62_Generic USA.ftf
02/039/2013 21:39:25 - INFO - Preparing files for flashing
02/039/2013 21:39:25 - INFO - Please connect your device into flashmode.
02/039/2013 21:39:26 - INFO - Opening device for R/W
02/039/2013 21:39:26 - INFO - Reading device information
02/039/2013 21:39:26 - INFO - Phone ready for flashmode operations.
02/039/2013 21:39:26 - INFO - Current device : LT18a - CB5A1FS2T0 - 1254-9461_R2I - 1241-4324_4.1.B.0.587 - WORLD-a_4.1.B.0.587
02/039/2013 21:39:26 - INFO - Start Flashing
02/039/2013 21:39:26 - INFO - Processing loader
02/039/2013 21:39:26 - INFO - Using an unofficial loader
02/039/2013 21:39:26 - INFO - Ending flash session
02/039/2013 21:39:26 - ERROR - C:\Flashtool\devices\LT18\loader_unlocked.sin (El sistema no puede encontrar el archivo especificado)
02/039/2013 21:39:26 - ERROR - Error flashing. Aborted
02/039/2013 21:39:26 - INFO - Device connected in flash mode
02/039/2013 21:39:28 - INFO - Device disconnected
02/039/2013 21:39:30 - INFO - Device connected in flash mode
02/039/2013 21:39:49 - INFO - Log written to C:\Flashtool\flashtool_2013-04-02_09-38-44.log
Ojalá y alguien me pueda ayudar. gracias