D855 Security error after jtag - G3 Q&A, Help & Troubleshooting

Hi all. I recently decided to use again my G3 D855 in order to test ROMs and other things.
As it already had many problems, I decided to restore it through the jtag method (I followed this thread: https://forum.xda-developers.com/sprint-lg-g3/general/guide-fix-hard-brick-recovery-guide-t3132359).
I tried with two different TOTs, and the process went fine, but when I rebooted I had a "security error" screen (see attached pic), just after the LG logo, and I can't do anything. I can't access download mode in order to flash a stock firmware, because it goes directly to the security error message, and after that it starts to reboot continuously.
If I try to access to recovery it stays on that (the Android with cube in the middle) for a while, but after few seconds it reboots again.
I have no clue on what to do now, I hope someone will be able to help me.
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Inviato dal mio LG-V500 utilizzando Tapatalk

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I live in Brazil, used Google Translate, if he did not understand something, pergutem for me to explain. Please help me, my Knock Code also not working.
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Sounds like it is trying to download. Being that your in Brazil, you have the ls980 unlocked which is altered the main boot file. This will give you an error and if you install will brick your device.
Sent from my LG-LS980 using Tapatalk
it wont successfully update unless there are not medications to system files (sim unlock modifies files)

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Hello.
Recently I faced a problem on my LG G4 H815. I was trying to use my phone and suddenly. the phone reboot itself, and stuck and the bootscreen, infinte loops. Turn on, LG Logo and then turn off...
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"lightbox_error": "The requested content cannot be loaded. Please try again later.",
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"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
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[removed by dentralp]

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"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
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Tried some Youtube guides, as changing from EXT 4 to EXT 2 and back again, repairing the file system, but it just says the same thing all the time. Any ideas how to fix that? Thanks in advance!
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I attached an image so you can see.
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try to boot to download mode by pressing vol + and vol - and then connect to pc
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Don't update recovery. Because it is custom made otherwise every reboot root will lost
I have the exact same problem. Please tell me if you found a solution

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