Default [Q] [SOS]HELP to unbrick xperia

Hello guys
its poblem in lt25i
Bricked after flashing cm 10.2
kernel corrupt destroy my bootloader
- led red only
- dont's work PCC,SUS,FLASHTOOL
- Driver reconizer QHSUSB_DLOAD
- black screen

I doubt

- with QSTP can flash boot.img?
- how to backup system image?
- is there any way to recover?

are solved threads with the same problem over other brands
please help me