j700f dead after flash

J700F FRP lock .Already Checked folowingsteps. But faild please help
1: otg metherd
2:hard rest and tried otg metherd
3: Tried To frp reset (z3x,octopus; bst)
4: flashed with 4 files and pit.
Now phone 100% dead and not detecting in computer
how to solve PlZ Plzzz Pllzzz Help Me Brozzz