lg g4 unbrick(dead boot repair)
LG G4 H811 Dead Boot Repair
1= Card Reader+Data Cable
2=  SD Card 32 GB or 64 GB
3= SD Card Formatter4 link==download
4= Win32DiskImager link=download
5= Original kdz link =download
6= System Image Bin File link=download
7= LG UP Tool link=download
 Steps to unbrick

 1=Insert your memory card in Card Reader and Format it using Windows Format. While formatting "uncheck Quick Format" and Change Type to "exFat". You can alternatively use SD Card Formatter4 but make sure that the card is in exFat  format
2=Once format is completed, install Win32DiskImager and open it. Add SystemImage.bin  file. If it does not show the bin file just rename SystemImage.bin  to SystemImage.img  and then select it. Select your memory card and Click Write
3=One the Write Completes. Eject Card and insert in your LG G4 H811. Press Volume Up Button while connecting the USB Cable
4=There you go, it will open the download mode. Now Open LG UP Tool as admin. It will show the device as connected. Select the Original kdz Firmware and Click Start. it will complete and your Mobile will reboot
 5=Now its Done