Error when flashing with Flashtool!

[Rayday]

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

[Uliwooly]

re-download both flashtool and the FTF file and try again 

[blackbox]

The clue's in the error message - you don't have the required drivers installed.

There's a directory named "drivers" under the main flashtool dir. Run flashtool-drivers.exe and install the appropriate drivers. I think "Common Drivers Viskan Board" is the one you need. I ended up installing all of them to get it to flash (which took ages).

[Rayday]

I think I did install that I also installed the other couple of files which included Xperia SP but still no hope.

[blackbox]

Install all of them. Takes a while, but that's what I had to do. The guy who wrote the driver pack recommends to do that too if it doesn't work.

[Rayday]

Then did it work for you properly?

[Uliwooly]

it wouldn't hurt to install the latest WMP update and JAVA 

[blackbox · Accepted solution]

Yes, it worked when I installed ALL of the drivers.

[Rayday]

Alright, Thanks a lot bro. Btw, it was an SP, right?

[blackbox]

Yes, SP.