@Vinod, it doesn't even go to download mode according to the description of Kunal(Kmc251), what he has in hand is a classic case of a phone stuck in QHUSB_ Bulk mode(if you check the device manager, you will see LG G2 detected as QHUSB_Bulk and as soon as you connect your phone, number of drives open, all of them prompting you to format to be used, except for only one drive). Thankfully there is a solution for this, but you need to have a linux OS to do recover it. Head over to the following thread @ XDA for detailed instructions.
WARNING: Don't download the files(partition files or img files) that are provided in the link which is given on that thread, they are for D802 model. Download LS980 files from here(those are ZV8 partitions, you can select ZV7 partitions as well). After downloading the necessary files that are required(like sbl1.img, aboot.img etc), follow the instructions given in that thread. Once again DON'T DOWNLOAD THE PARTITION FILES AVAILABLE IN THE LINK THAT IS PROVIDED IN THE THREAD, THEY ARE FOR D802, IF YOU DOWNLOAD ANY OF THEM & FLASH IT ON LS980 IT WILL BRICK, CAN'T STRESS MUCH.