OPO won't boot past boot logo, can't reach recovery

Hey guys.

Some issues right now....

I can't get the phone to boot. It gets stuck on boot logo. I can get it into fastboot, but not recovery.

If I try to enter recovery, it shows boot logo, then change brightness level a little bit for some reason, then nothing. Back to boot logo after screen goes black.

So it appears that the TWRP isn't installed correctly, but I've reinstalled it several times, but it never actually seems to work.

I can see the device in fastboot. Bootloader is also unlocked.

So, does anyone have a solution for this issue?

Help UnBrick LG G2 Phone that is able to reach flashboot

So I rooted my phone and that worked out alright
however, when trying to obtain TWRP using a method on youtube called "Easiest way to Install TWRP Recovery on the LG G2 all models" by Root Junky made on December 21, 2014

it bricked my phone, I was able to get the recovery mode but after hitting reboot to system I was sent to this sequence of events
lg logo appears, it flashes to lg log with text below saying "Security Error", then flashes off
If I try to reboot, same thing happens
however, I am able to get to flashboot mode and my phone is still stated as rooted

so how do I get out of this, or is there no way

btw phone info (at&t lg g2)
android version 5.0.2
Kernel version 3.4.0
Software Version D80030g

thnx for any help that comes in
sorry but I am kind of a noob
ps, someone mentioned I may be able to " flash TWRP through the fastboot mode" to fix it (does that work and if it does how do I do it)