How to solve Security error/Flash Stock TOT file LG Optimus G (all models)

First off All Download needed files :

Download link LGNPST automated  :

This tutorial is for Att model :

Download correct file for your phone

Extract Zip and you will get TOT File 

rename it to Bin 

Now Download LGNPST automated Zip and Extaract it 

After Extracting Run Install.bat as administrator 

After completeing installation press enter 

Now open Directory where LGNPST is installed 

It is in LG electronics folder 

for 32 bit system users go to programe files/ LG electronics
for 64 bit system users go to programe files(X86)/ LG electronics

Now open LGNPST in LGNPST folder 

Connect your phone in USB by pressing and holding both Vol + and - key 
It will connect to Download MOD

As you connect your phone drivers are started to be installed 

After drivers are installed you will be able to see your device 

Now click right side of DLL file files and select LS970.DLL

Now click right side of bin and select bin file which we renamed 

Now click start and it warned you that this process will erase your data 
click ok

Flashing will start and at 67-85 % it will flash firmware 
if your device is booted then you can unplugg your device If not than you have to keep it plugged up to 100% 

PART 2 :

Send feedback 

All credit gose to +ShoaibShaikhE970  Thanks to shoaib 

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