Unhappy [Q] Sony xpera arc s bricked

i recently bought a sony xperia arc s from a friend....it had andriod 4.0...it was running slow so i wanted to downgrade it to gingerbread.....i used flashtool and flashtool failed saying processing kernal.sin failed....now my phone is showing anything except phone and yellow sign when i turn it on...

I USED SONY UPDATE SERVICE AND IT DETECED MY DEVICE AND DOWNLOADED A FIRMWARE OF 230mb BUT IT FAILED WHILE INSTALLING A FIRMWARE...


PLZZZZZZZZZ HELP ME OR ELSE I LOSE 20000PKR PLZZZZZZZZZZZZZ...

HOW CAN I UNBRICK OR RESOLVE THE ISSUE