D802 Security Error bootloop, no download mode, no recovery - G2 Q&A, Help & Troubleshooting

Hi. I have a big problem. After flashing modded rom i get an error. After reboot i have Security Error and bootloop. Computer don't recognize phone. I can't also go into download mode or recovery. Fix solution with ubuntu don't work because ubuntu see only sda partitions. Can anyone help me with this?

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LG G2 Bootloop Bricked - No recovery or Download mode

Hi guys, I might need some help or a walk through here, I might have bricked my phone. I stump-rooted my phone ( 4.4.2) and installed TWRP Recovery 2.8.1 initially , Installing SuperSU which patched my sdcard and rebooted causing my phone to get stuck in a boot loop giving me no access to download mode, just recovery. From there I tried to install Cynogen mod 12 in TWRP recovery to fix the bootloop but any attempt at flashing gave me an error "error executing updater binary in zip." So I extracted the folders and flashed the 2.7.0 recovery.img which sayed it worked but now my phone is still stuck in boot loop, no download mode and when I try to enter recovery I get stuck in fastboot mode with port change errors. I took some screenshots so it would be easier to help me out. Every time I plug in the USB I get the following errors, the screenshot is from continuous attempts
I have the mini sdk installed and Koush drivers. Device manager does not recognize my phone anymore but it does come up under Fastboot Interface
Any Help would be greatly Appreciated
Because I'm a new member I can't post screenshots so just add an h infront of the links.
Thanks in advance for all your help
ttp://i.imgur.com/mHcOYOL.jpg
ttp://i.imgur.com/WxZNNzi.png
Take a fresh KDZ for your model and flash it via LG FlashTool
wisefreakz said:
Take a fresh KDZ for your model and flash it via LG FlashTool
Click to expand...
Click to collapse
Can you please explain how to do that WITHOUT entering download mode?
Maybe LG Flash recognizes your phone and will do the job.
LG Flash does not recognize my phone at all. http://forum.xda-developers.com/lg-g2/general/lg-g2-unbrickable-fix-real-hard-brick-t2904404 Do you think this method will work?

D800 broken download mode

I once bricked my phone by installing a L01F ROM on my phone by accident, and had to manually reflash every partition in windows CMD prompt. I have been using my phone fine since I recovered from the brick but I was going to tot to stock and update to lollipop but my download mode says secure boot error and shows up as qhsusb_bulk in device manager and gives me a ton of partitions. I have been looking around for a solution but cannot find one. The only thing that is broke is my download mode. I have recovery and a booting ROM.
Link420able said:
I once bricked my phone by installing a L01F ROM on my phone by accident, and had to manually reflash every partition in windows CMD prompt. I have been using my phone fine since I recovered from the brick but I was going to tot to stock and update to lollipop but my download mode says secure boot error and shows up as qhsusb_bulk in device manager and gives me a ton of partitions. I have been looking around for a solution but cannot find one. The only thing that is broke is my download mode. I have recovery and a booting ROM.
Click to expand...
Click to collapse
Pm me, I'll help you.
Sent from my LG-D800 using Tapatalk
I have flashed a new laf.IMG but I still get the secure boot failure, boot certification error.
Repaired using skr tools. Wonderful set of tools

CM13 running OK but can't get recovery "secure booting error"

After installing CM13 (coming from 20H stock 4.4.2 firmware) I somehow ended up in the hard-brick Qualcomm HS-USB QDLoader 9008 mode.
I fixed this using these steps: http://forum.xda-developers.com/showthread.php?t=2582142 writing that old 2.6.3.2 TWRP and other .bin files extracted from the .kdz
Phone boots OK into CM13 now, but when I try to get into recovery (either using Power+Vol Down or through Advanced Reboot in CM) I get the error:
Secure booting error
Error: Boot Certification Verify!
Click to expand...
Click to collapse
Does anyone know how I can fix this, and flash TWRP? Tried TWRP Manager, Flashify etc, but they all give a flashing error. All fixes for this which I have found online seem to be for people who are running a stock ROM.
(I know going into download mode and returning to stock again etc will sort this, but surely that's not necessary?)

Unable to install qualcomm driver for Lenovo a6000 plus

I was trying to install custom rom and my device got bricked, now its stuck in boot logo. I am trying to install a rom but tried with qfil/qspt but device is not getting detected. Once I was able to install qualcomm hs-qd loader 9008(com 3) but it was not working so I removed it and now I am unable to install it again.
I tried to enter the recovery mode by flashing TWRP recovery, My device was prerooted and already i had install TWRP but a device was brick I was unable to access it. After flashing TWRP, I got the Mount screen of teamwin but touch is not working.its saying unmodified system partition detected. but after that I am unable to got to next step to install a rom in my device as qualcomm hs-qd loader 9008 not getting installed. Please guide me, I am new in all this,need expert help. thank you
@amitpandey, have a look AT THIS.
Still not detecting by my pc. Also unable to disable driver signature as in my laptop no option of troubleshooting option available in advance startup menu.

[SOLVED] [Loop] Your device is corrupt it cannot be trusted and will not boot

Hello,
I have an issue with my brand new G6.
It is in a loop "Your device is corrupt it cannot be trusted and will not boot" , no more recovery available.
What i did:
I unlocked the bootloader and flashed Magisk via TWRP the device displayed that the partition was corrupt and need to be erased.
After that the device was in a loop to twrp, whatever the wipe or ... no system boot.
I read that i had to format the data partition so i adapted a what i found here to my available partitions
https://forum.xda-developers.com/tmobile-lg-g3/general/fix-recovery-loop-twrp-computer-t2873386
the device is now in a constant loop.
Does someone can help me please ?
is there any way to recover it ? download mode ? how ?
Update : I succeed to boot into download mode but LGUP gives me an error while trying to flash
error 0x2000 ... ... cefs::initialize()
docizoc said:
Hello,
I have an issue with my brand new G6.
It is in a loop "Your device is corrupt it cannot be trusted and will not boot" , no more recovery available.
What i did:
I unlocked the bootloader and flashed Magisk via TWRP the device displayed that the partition was corrupt and need to be erased.
After that the device was in a loop to twrp, whatever the wipe or ... no system boot.
I read that i had to format the data partition so i adapted a what i found here to my available partitions
https://forum.xda-developers.com/tmobile-lg-g3/general/fix-recovery-loop-twrp-computer-t2873386
the device is now in a constant loop.
Does someone can help me please ?
is there any way to recover it ? download mode ? how ?
Update : I succeed to boot into download mode but LGUP gives me an error while trying to flash
error 0x2000 ... ... cefs::initialize()
Click to expand...
Click to collapse
Can you boot to TWRP?
Did you make a backup and have access to it? Especially the EFS partition? If you do, restore the EFS partition.
If you can boot to TWRP, try the following:
- wipe everything (the option where you have to type 'yes').
- download lineageOS and flash it. If this is working fine, install whatever ROM you want to install.
no access to twrp anymore , no backup , only access to download mode now
is there a way to flash back twrp or stock recovery from download mode ? boot into fastboot ?
(i know... i have no excuses , but made that so many times without issues ...)
thank you in advance
Maybe you should go in download mode and flash stock Rom with LGUP.
LGUP gives me an error while trying to flash the rom error 0x2000 ... ... cefs::initialize()
Can you flash twrp through lgup or fastboot?
For those that could be in the same situation i finally succeed to flash with LGUP last version but without the 8894DLL
the error was probably coming from the dll.
Cheers and thanks all for the answers
docizoc said:
LGUP gives me an error while trying to flash the rom error 0x2000 ... ... cefs::initialize()
Click to expand...
Click to collapse
It's probably a problem with the DLL, try to extract it from the kdz and input it in Lgup folder (I don't remember where and I'm not home, check the main thread for that) and after that retry flashing
EDIT : well you were faster than my phone glad it worked for you.

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