[Update] If you experience any issues with this LG Flash tool 126.96.36.199,Please try the latest LG UP software. The LG UP supports both KDZ and TOT files, and you can use LG UP to unbrick/restore your LG G5 back to Stock.
To restore/unbrick your LG G5 You need
Thanks ieatacid over at xda forum, we have a full working LG Flash tool 188.8.131.52 now.
We have got the DLL files for LG G5 H860 model. check it here.
TOT format firmware for LG G5 models are not available for download at present.
Stock firmware in kdz format for U.S. Verizon LG G5 VS987 is available for download via this link.
More LG G5 Stock kdz firmware is available for download at this link, A page you can track LG G5 Software update history and Download Stock KDZ firmware for LG G5.