Need some help

I HAD SE XPERIA X10I,BUT NOT WORKING,TRYED SEUS,PCC COMPANION,FLASHTOOLS,NEW BATERY,BUT NOTHING HELP SO FAR,,,

HERE IS MY LOG FROM FLASHTOOLS

07/028/2014 14:28:28 - INFO - <- This level is successfully initialized
07/028/2014 14:28:28 - INFO - Flashtool Version 0.9.13.0 built on 2013-06-04 22:50:00
07/028/2014 14:28:32 - INFO - Device disconnected
07/028/2014 14:28:37 - INFO - Selected X10i / 3.0.1.G.0.75 / GLOBAL-GGL GENERIC 1232-9897
07/028/2014 14:28:37 - INFO - Preparing files for flashing
07/028/2014 14:28:38 - INFO - Please connect your device into flashmode.
07/029/2014 14:29:01 - INFO - Device connected in flash mode
07/029/2014 14:29:02 - INFO - Opening device for R/W
07/029/2014 14:29:02 - INFO - Reading device information
07/029/2014 14:29:02 - INFO - Phone ready for flashmode operations.
07/029/2014 14:29:02 - INFO - Start Flashing
07/029/2014 14:29:02 - INFO - Device loader has not been identified. Using the one from the bundle
07/029/2014 14:29:02 - INFO - Processing loader.sin
07/029/2014 14:29:02 - INFO - Checking header
07/029/2014 14:29:02 - INFO - Ending flash session
07/029/2014 14:29:02 - ERROR - ERR_SEVERITY="MAJOR";ERR_CLASS="SECURITY_CLASS";ERR_DYNAMIC="SIN header verification failed"
07/029/2014 14:29:02 - ERROR - Error flashing. Aborted
07/029/2014 14:29:02 - INFO - Device connected in flash mode
07/029/2014 14:29:03 - INFO - Device disconnected
07/029/2014 14:29:04 - INFO - Device connected in flash mode


CAN ANYONE HELP ME TO UNDERSTAND THIS ERROR.....

PS:I AM ABLE TO GET FLASH MODE AND MY BOOTLOADER IS UNLOCKED.


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