Unhappy PLEASE HELP!!!-Xperia sp wont start after update failed

My xperia sp won't start after an failed update attempt via pcc.Now when i turn on my phone it just shows sony logo then it just turns off.I tried to flas it via falshtool but it stops after like 80 % and shows this error message
16/027/2014 17:27:22 - INFO - Processing cache.sin
16/027/2014 17:27:22 - INFO - Checking header
16/027/2014 17:27:22 - INFO - Flashing data
16/027/2014 17:27:24 - INFO - Processing system.sin
16/027/2014 17:27:24 - INFO - Checking header
16/027/2014 17:27:25 - INFO - Flashing data
16/031/2014 17:31:58 - INFO - Ending flash session
16/031/2014 17:31:58 - ERROR - Read error :31 : A device attached to the system is not functioning.
16/031/2014 17:31:58 - ERROR - Error flashing. Aborted

Even when i try to repair it via sus it runs till 90% then says it couldn't repair my phone please help me guys.