K well I'm going to go ahead and type out the intructs now because I keep forgetting who's problem is what when it takes days to solve.
So if that rom looks like a go, you'll want to download it to your PC and leave it zipped. I would recommend editing the name to simply rom.zip so it'll make typing the command easier in a moment. Then, place the rom.zip into the sdk-tools folder right along with all those img files from earlier.
Now with the phone hooked to the pc and while in recovery (don't select any options in recovery, just stay at the main screen and choose nothing)...go ahead and enter the command adb devices. Watch your phone's screen carefully at this time. If you get a popup on the screen for RSA authentication, check the little box to "always remember this PC" or similar, and then accept.
The adb devices command should output a string of numbers and it'll probably also say "recovery" next to it. If so, all is well.
Next enter this command:
adb push rom.zip /data/media/0 (that's the number zero)
Now give it some time. The rom should be pushing over to the phone but you might not get any indication of that for some time due to it being a large file. Give it up to 20 minutes or more if need be. When it's done, it should report that it sent a file of xxxxx size and it took xxxxx time. Then you know it's all done.
Next, according to the rom's instructs, you'll want to select some things in TWRP recovery. Select option to wipe, and then choose the options to wipe cache and dalvik cache.
Next, choose TWRP option to install. That should bring up your internal storage directory and hopefully the rom.zip is located there. If not, use it as a file manager and find your way to either /data/media/0 or /sdcard, they are one in the same. Select the rom.zip file and proceed to flash it.
When it's done, it may boot the phone on its own, if not select the TWRP option to Reboot > System.
It may actually boot to the rom if all goes well. If so fine, but the larger hope is that when you power back down and then go into download mode...your device will now be recognized as a D802. If so, go ahead and run the LG Flash Tools software as you were trying to do before. From where you're coming from, I think it would be best to restore complete and total stock and then you can regroup from there and decide what you want to do, if anything.