-Assistance needed- Cannot recover phone to stock or anything

[Android Central Question]

Alright, the phone is LG Optimus G Pro Lite, and is not a dual sim variant. The model number is LG-D680. Basically what I want to do is restore the phone to its formal glory, since I got the phone in the "Security Error" state.

Steps I tried and failed:
First, I tried to go into recovery mode(volume down and power button both hold), and all it showed was "Factory hard reset" option which gave me the choice of pressing the power button to confirm and any other button to cancel.

That didn't work even though I tried to factory reset so I tried the LG Flash Tool 2014 to flash a stock rom while it was in "Download mode", but probably because I haven't got all the drivers it stopped at 30% in that all clear mode and the program stopped.

I then got the official lg recovery program and tried to recover it. It no longer showed the security error, but this time an android lying on its back and a red triangle above it. Recovery mode is just "Factory Hard Reset" with the previous options only available(Press power to confirm, press any other button to cancel) so I couldn't do anything about recovery mode.

I tried the LG Flash Tool again this time with all the drivers needed, but it stopped at 80% and force closed. I tried both with the jellybean update stock rom and the KitKat update stock rom and were both unsuccessful.

The official recovery tool definitely recognizes my device(Only in download mode) and says it has the latest version and is in V20A_06.

I need help restoring this device...

 

[FOXX SCREECHIST]

From what I know, the device probably has Telcel carrier, but I'm not too sure... and also the thing does boot but gets stuck in the android with the red triangle before restarting and getting stuck again

 

[FOXX SCREECHIST]

-New update- the phone still does not work however whenever the phone turns on the home button lights up in a rainbow fashion before and while the android with the red triangle is shown

 

[Rukbat]

Are you sure you're flashing the right ROM for your carrier? Some models of some phones have hardware differences for some carriers, and flashing a ROM for a different carrier won't work.

 

[FOXX SCREECHIST]

I'm pretty sure, since the seller told me specifically it is a telcel device, and I've tried both the locked and unlocked versions of the rom, but got no success