[Verizon LG G2] Kreszenz:
I've had my Verizon LG G2 for almost a year and mistakenly upgraded to Lollipop. I researched downgrading to KitKat and it looked safe; I had dual booted my HP Touchpad with a similar process.

I tried rooting with ADB, but it was giving me fits. I used the LG One Click Root Tool. It worked fine. (Running on Windows 7.)

I installed TWRP v2.8.5.1, and downloaded a stock version of KitKat 4.4.4. (I'll admit, at this point, I had looked at multiple guides. Many had missing links or dead ends, but they were all about the same, and always stock.) I followed instructions on clearing and wiping caches, etc. I believe the exact ROM I tried to install was VS98011A_01.zip. It didn't work. It gave the error:

"assert failed: run_program("/tmp/loki.sh") ==0

E: Error executing updater binary in zip"

I looked for more ROMs and tried ParanoidAndroid "pa_g2-4.0-ALPHA-20131203-vs980.zip". At this point, I started to worry and tried installing the Gapps file I downloaded with the stock ROM, and it installed with no problems.

I then tried to install a newer version of TWRP "twrp-2.8.6.0-vs980.zip". (Again, I hadn't really found any great guides at this point, especially to fix my problem, so I was assuming there was something wrong with my ROMs.) It didn't work, and I tried to install Cyanogen Recovery because I ran across it and remembered it from my HP Touchpad. "cm-10.2-vs98012b.zip" did not work, and gave the error above.

I looked for Loki issues and tried downloading a fresh Loki (sorry, I don't have the link) folder and replaced all the files in the original KK .zip I tried. Same loki error. (Sometimes I'll get a "sysMapFile" error, but not often. At this point, I'd dragged a lot of things over to try to install and get anything to work.)

At this point, I tried the following:

http://xdaforums.com/showthread.php?t=2448960

http://xdaforums.com/showthread.php?t=2451696 (as well as a similar one by downloading a laf.img)

http://xdaforums.com/showthread.php?t=2797190

http://xdaforums.com/showthread.php?t=2432476

http://hackerspace.lifehacker.com/how-to-install-a-rom-via-sideload-1505153925

http://xdaforums.com/showthread.php?t=2318497

http://www.androidayos.com/2014/10/06/fix-bricked-lg-g2-stuck-logo-twrp-bootloops-download-mode/

http://xdaforums.com/showthread.php?t=2448960

There were definitely some more links I used but these were the most promising and the ones I still have open.

Several of the LGFlashTools were very close to working, but there were several issues:

1. I can't get it into Download Mode, as it gives a boot certification error.

2. There were some problems with the phone not showing up in Device Manager under "Ports" with COM41, and I thought I had largely resolved that issue. (Depending on the article I was looking at.)

3. Drivers, I'm not sure if they're an issue; I've downloaded several, and installed them, including 2.0 and a 3.1.

ADB does not recognize my device, as I've tried sideloading, although I can still drag and drop files. (I believe I pushed a file into the device early on and it worked though.)

4. Fastboot recognizes there's a device and can boot it via CMD but will not give a number when I use "fastboot devices". I've researched some flashing via Fastboot, and tried flashing the original KK .zip with it, but it said there wasn't enough space. I have about 14GB left on a 32GB device, however.

I hope I've provided enough information, because I've researched and tried so many ways to unbrick it, short of physically opening the phone as suggested here: http://xdaforums.com/lg-g2/general/lg-g2-unbrickable-fix-real-hard-brick-t2904404

Any advice or suggestions would be greatly appreciated. I would love to know what I did wrong, because I know custom ROMs would be a great alternative to dealing with Lollipop until I can upgrade over a year from now.