LG Optimus Big Lu6800 security error - Android Q&A, Help & Troubleshooting

Good day to all!
I don't know the history of this phone so please bear with me for a while.
--
I just got an old LG Optimus Lu6800 from a friend and when I turn it on, it only flashes the LG logo with "Security Error" written below. It turns itself off after 3-4 seconds.
I tried turning off the phone and pressed volUp + power and volDown + power to see if I can access emergency mode/download mode, but nothing happened.
I searched for the Stock ROM for Lu6800 but nothing came up useful..
How am I going to fix this?
Please help me. :'(

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Hi. I did http://forum.xda-developers.com/showthread.php?t=1586570 this to my phone and since then every time I turn it on the black screen with AP Fastboot flash failure appears and not the Motorola logo. Not that I turn off my phone that often, but it's frustrating. I have to pres Vol Up/Down + Power button and choose Normal boot everytime I want to turn on the phone. Please explain me how to unroot or I don't know, I have the phone for 5 days now. I want it to look like I've just opened the box
P.S. Already tried Factory reset, doesn't help, still the black screen when I press the power button to turn on.
P.S.2 My system version is 651.167.3370.XT910.AmericaMovil.en.01 if it matters.
Really? The link I posted is from this forum. Come on. I should be able to undo this flash I've made and really return to fabric settings.

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david.shuler21 said:
So I had rooted my phone successfully about 2 months ago. I then proceeded to use Pimp My Rom to further pimp it out. I had played with the settings a lot and the last thing I remember is enabling quick boot, along with a LOT of other tweaks. I then rebooted and it turned on simply showing LG logo and bypassing all other boot screens[MetroPCS]. Phone was working great. I decided to reboot the phone and now it shows LG logo and then black screen. I can tell the backlight is on, but nothing happens. When I do Vol Down + Home + Power it shows the android with the thing in his belly and then it just reboots into a black screen. Vol Up + Home + Power does nothing. I'm not sure what to do. HALP!
Click to expand...
Click to collapse
Hi david.shuler21, perhaps this could help you:
http://forum.xda-developers.com/showthread.php?p=50729855
Good luck.
Sent from my LG P76020L-EUR-XX unlocked and rooted

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Thanks in advance to anyone thats helps me resolve this problem. :good:
Anyone ?
No one can help me with this issue?
Any advice?

[FIX] Secure Boot Error 1 minute solution

I have installed Crdroid Nougat ROM to my LG G2 D802 yesterday, everything was fine. After flashing something via recovery phone went dark. When I boot device it shows only LG logo with secure booting error, then the screen goes black while phone is still on. Download mode and recovery wasn't working. When I plug to usb computer was going crazy with device errors. I tried a lot of solutions like this , with ubuntu and windows 10. Nothing worked for me. After a few hours I found a simple solution in a forum. Worked for me, maybe work for others..
Press Power and Vol Down buttons together for about 10 seconds, When you see LG logo release for a half of second and immediately press and HOLD again Vol Down + Vol Up button. Factory reset screen will come. Select yes with vol down button and press power button to factory reset.
themaster33 said:
I have installed Crdroid Nougat ROM to my LG G2 D802 yesterday, everything was fine. After flashing something via recovery phone went dark. When I boot device it shows only LG logo with secure booting error, then the screen goes black while phone is still on. Download mode and recovery wasn't working. When I plug to usb computer was going crazy with device errors. I tried a lot of solutions like this , with ubuntu and windows 10. Nothing worked for me. After a few hours I found a simple solution in a forum. Worked for me, maybe work for others..
Press Power and Vol Down buttons together for about 10 seconds, When you see LG logo release for a half of second and immediately press and HOLD again Vol Down + Vol Up button. Factory reset screen will come. Select yes with vol down button and press power button to factory reset.
Click to expand...
Click to collapse
This worked beautifully after a few tries to get the timing right! Thank you!!

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