İm stuck at fastboot mode - G3 Q&A, Help & Troubleshooting

My D855 got stuck in Fastboot mode, i try to get into TWRP, . I cant go to Download mode, it straight goes to to Fastboot mode..... Now my phone couldn't switch back to download mode., only stays at LG screen.....it saya security error. What can i do in fastboot mode? I try to do the command to restore the stock recovery, no working at all.....and all errors.....it says waiting. And my pc only can detect the phone when its in Fastboot mode, which is i can't flash stock rom or else..... Is there anything that i can do to get my phone back?all drive installed.LG flash tool cant cant detect the phone.how can i go back to download mode. Pc can detect the phone on fastboot mode,commands appear.on the LG G3 screen but nothing happens.

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Stuck with Fastboot , now stuck in Recovery with no adb

I Have an LG G2 - Sprint phone the LS980 , been experimenting with it lately , however the last experiment went all wrong
I flashed the stock Rom of the Indian version KDZ file using the LG 2014 Flash tool, I was able to boot but Obviously there were a lot of issues using the OS . However on the next reboot I was stuck in a fastboot loop.
While in the fastboot loop , I was able to erase all partitions one by one and flash back these specific to the ZVC firmware http://downloads.codefi.re/autoprime/LG/LG_G2/LS980/Stock_Firmware/zvc_partitions/
Now I only have Recovery mode and even though I have recovery mode , I cannot adb sideload a file as the system keeps saying it cannot detect a device !
I also tried the Download mode , I can enter the Download mode , but the LG tool will no longer flash it.
Any suggestions ?
Was able to get Download mode going with LG Flash tool , but I now get this error.
ERROR: laf Partition has Changed

Fastboot Not Working

Device recognized as ? in fastboot - won't return an identifier.
Commands can be given but nothing ever happens.
Just sits at "erasing..." , "flashing...", etc.
Trying to flash laf.bin to bring back Download Mode.
TIA for any ideas

Can't get into Download mode

Edit: I somehow could reach to fastboot mode and flashed laf.img to recover download mode but I get a boot certification verify error. I can access the phone and recovery but cant access download mode.
I decided to upgrade to MM from LP using kdz method. However I could not boot into download mode with any method. The phones just reboots normally. I tried hard button(volume up and connecting to pc), I tried adb reboot bootloader, I tried to reboot to bootloader from twrp and none of them worked. In every method I used the phone just reboots normally.
I have root + twrp with stock 5.0 rom. Any help appreciated, thanks!

Can only go to fastboot mode, please help!

I'm new to all this. My device was bricked. So I flashed boot, droidboot and recovery file of my phone and after this when I boot my phone only fastboot mode comes, even I tried charging my phone and still the fastboot mode is coming. I tried to open recovery mode from the fastboot mode and it would boot into the fastboot mode. Please help!!

Fastboot mode doesnt detect my device

ADB recognizes my device but once i boot into bootloader it doenst recognize my device.. Before this when i flash stuff everything was ok . Today when i flashed 5.8.0 (RR 7.1.1) rom.. All this happen.. I cant even open recovery mode anymore. It just gets stuck at boot logo when i try going into recovery mode. Any solutions? Thanks

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