Originally Posted by SuperSport
D800 and D805? Thank you. If I get any further, I'll let you know what steps I've found work.
The unbrick tool links for D800
This tool works when the QHUSB issue occurs. Many posts suggest using a linux box to fix. But this tool works just fine with windows. And it even works when there's complete black screen i.e. no fastboot, no LG logo, no download mode.
And I was able to solve the cross-flash issue that I had with my phone using one of your own posts. I just had to use the DLL given by you in the LG flash tool. Thanks for that supersport.