[Q] G3 D850 stuck in fastboot, no download mode - G3 Q&A, Help & Troubleshooting

Hello friends i have LG G3 D850 (AT&T) 32GB . I tried to format the phone and suddenly the process stopped and now i stuck in boot loop(fast boot) the phone start to the AT&T logo than dim to black screen and go again..
When i tried to get into download mode it's shows me "secure booting error" dim to black screen and the led is flashing red&blue.
i've found this http://forum.xda-developers.com/showthread.php?t=2477595 thread but couldn't find the right files can you help me? please!!!

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[Q] Bricked G3

Hi everyone, new member. Recently my g3 got in a bootloop so i hard reset it. Everything seemed to work fine but after a short time the device used to get stuck and restart. I followed a guide how to revert back everything to stock but something went wrong and the device got stuck on MiniOS and then Reset Status 2.
i tried to fix it by flashing it with .kdz file but for some reason now when i turn it on it says: Secure booting error and the screen turns black and the led starts flashing red and blue.
I cannot access download mode cause it goes straight to the lg logo and black screen but u can access recovery mode. i already tried a hard reset but its no use as the device gets back to the black screen.
Any help would be immensely appreciated as this is my second g3 in 4 months and im tempted to throw it away.
Thanks and good day
Post your device model variant (D850, D851, D852, etc.). Also check out these two threads...
[Q] Bricked LS990 - Can't access recovery or download mode ...Specifically post #16
http://forum.xda-developers.com/sprint-lg-g3/help/bricked-ls990-access-recovery-download-t3053985
[q] lg g3 d855 hard bricked no download mode or recovery!
http://forum.xda-developers.com/lg-g3/help/q-lg-g3-d855-hard-bricked-download-mode-t3090911

[Q] lg g3 on a boot loop

I tried the one-click root method on my d855 32GB running stock 5.0 but now it doesn't get past the LG logo boot screen ive tried the reset to factory default setting and set it to default still does the same and sticks on the boot screen . went into download mode aswell it doesnt pick up inthe pc and it then says updating firmware but does nothing. so i switch it on and off and it still stuck on the boot screen. is there anything i could do to fix this please.

F460L Bootloop, can enter download mode but still stuck in bootloop after flash.

I tried flashing MM kdz with LG Flash tool but when my phone reboots it will just go back in to the bootloop. It will show the LG logo then screen will turn black and the logo comes back up again and it repeats. Help please. I searched everywhere and tried almost all I know.
Anyone? Please

[Help] Possibly Bricked LG G3 D855

My LG G3 is and international D855 and is unable to enter recovery, with the phone going black after the twrp logo shows for a few seconds. The phone has no OS installed because I was going to flash a custom rom so there are only bootloops when booting up the phone. Entering download mode is not any good either because a message appears saying secure boot error and the phone goes black with only the LED flashing Red and Blue, I tried going back to stock with fastboot but in the process I lost the ability to enter fastboot, is there any hope
I'm hoping somebody can help and I would be extremely greatful, Cheers
If you can't access Download mode or fastboot mode.you have to do this as in thread.
http://forum.xda-developers.com/sprint-lg-g3/general/guide-fix-hard-brick-recovery-guide-t3132359

Softbricked LG G3 D855 not staying in download mode, and not going into recovery.

Hi,
I recently installed flashify on my LG G3. It was sometimes switching off during use and I thought to try and install new ROM.
Now however, it does not start. Going into recovery mode returns an error 'Secure boot error' and leads to black screen with red/blue LED fash. Going into download mode causes a message to appear in small text in the middle of screen 'Recovery mode' (not full screen like normal) but then resets after 8 seconds and goes to black screen.
Hence using LG flash tool to flash stock ROM is impossible because it resets itself after 8 seconds.
Please help!
Thanks.

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