LG G3 not starting! (LG G3 F400K) - G3 Q&A, Help & Troubleshooting

Hello friends,
I own an LG G3. I was trying to install Miui 8 Rom for LG G3 F400K through twrp. After the install, the device got stuck in a boot loop. The only thing which working was fastboot mode. So while troubleshooting in fastboot mode (Activated by pressing Vol up while connecting to PC) I by mistake removed aboot image. Now the device does not start. No screen nothing. No sign of life from the device. Please help me.
- Nirav Agarwal

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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

LG G3 D855 Shuts down after LG Logo

Hi Guys,
My LG G3 D855 32 GB cannot start after LG Logo. It doesn't go to download mode and recovery mode. I tried to downgrade to KitKat from Lolipop using the LG Flash tool + Tot File method. It failed in 16% and now i cannot go to download mode or recovery mode. It goes LG Logo and shuts down. I have swapped batteries, it doesn't even go to the firmware update page. I don't know whether it gor bricked. Please help me with a solution.

[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

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