lg us991 dead after flashing on z3x 9.21

Salam

today i flash my lg us991 flash through this file

LGUS991AT-00-V10c-USC-US-JUN-01-2015+03

and after flash my set not work.not show charging.not go to download mode.when i try to connect computer only conecting sound come.

plz z3x team help me what i do:confused: