Sony Xperia Z3 HARD BRICKED topic

Hi. My device is hardbricked. I see no lights while charging. Flashtool doesn't see my device.how can i fix this?

Edit:Easily fixed it.I plugged my device into the computer.I entered platform-tools and flashed boot.img.I saw "waiting for device" And i pressed volume up and power buttons. Suddenly boot flashed and i recovered my phone