Before I have to go to work, I'm going to post the method I'm most familiar with. If you strike out with whatever method you're using, you can refer to this if desired.
Use
these instructs.
On line 2, where it says to d/l your tot and dll file, don't use that link. Instead use
THIS link which should look familiar to you since that's where you also got the partition img's from earlier. This time though, you'll want to download the file called BIN_LGD802AT-00-V10b-EUR-XX-SEP-07-2013-16G, and the dll file at the very bottom. Inside that large zip file is the .tot for your device. Yes, it's an older one but using that tot and the listed bin will bring you to original stock. As long as you receive OTA updates at your location, you can just accept OTA's when you're done with this and you'll end up back on the latest firmware.
On the original instructs page I linked, it mentions swapping out the megalock dll file in the Flash Tools software package. If you do that and you end up with any megalock errors when attempting the flash, here is an alternate megalock dll to swap out instead:
Alternate megalock dll (only use if needed)
So to review...download LG Flash Tools software, the tot and dll for your phone, then follow the instructs as posted in the link. Note the pictoral that's also available there to help you along the way.
I have heard that some of the altnernative methods to flash stock on LG phones don't work as well on the G2 because of its huge rom size. For some reason that seems to mess with them. I've seen very few issues reported with the LG Flash Tools method however. So good luck if you need this.
source and thanks: autoprime of the xda forums, freenode IRC and team Codefire. If there were others involved in the writeup and file storage solution, thanks to all.