help Z3 hard bricked

Hi,

i have an XPERIA Z3 D6603 that i bought from the net, i recently flashed an edited ta.img, and the phone go to hard brick, its not detected on flashtool or device manager, when connected to pc or charger the red led indicator start flashing continually, please help me to get it alive.
and by the way i have the full backup of original TA,
i want an detailed explanation or tutor because im not familiar with repairing this kind of problems,


thanks and sorry for my long topic.