Hello there, I am trying to Flash my Phone back to 4.1.2 but it has Errors. Initially, it was the b2 boot up error or something now it is SEMC flash device ERROR!!! Please help?

26/002/2014 17:02:39 - INFO - Please connect your device into flashmode.
26/003/2014 17:03:12 - INFO - Device disconnected
26/003/2014 17:03:41 - INFO - Opening device for R/W
26/003/2014 17:03:41 - INFO - Start Flashing
26/003/2014 17:03:41 - INFO - Processing loader.sin
26/003/2014 17:03:41 - INFO - Checking header
26/003/2014 17:03:41 - ERROR - Processing of loader.sin finished with errors.
26/003/2014 17:03:41 - INFO - Ending flash session
26/003/2014 17:03:41 - ERROR -
26/003/2014 17:03:41 - ERROR - Error flashing. Aborted
26/003/2014 17:03:42 - ERROR - Drivers need to be installed for connected device.
26/003/2014 17:03:42 - ERROR - You can find them in the drivers folder of Flashtool.
26/003/2014 17:03:53 - INFO - Device disconnected
26/003/2014 17:03:58 - INFO - Device connected with USB debugging off
26/003/2014 17:03:58 - INFO - For 2011 devices line, be sure you are not in MTP mode
26/005/2014 17:05:43 - INFO - Device disconnected