invalid boot image header - G4 Q&A, Help & Troubleshooting

delete please solve by Download Mode and LG Flash Tool 2014 (H815_SEA_10B_00.kdz).

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D856 Fastboot to download mode

I want to go back to download mode from fastboot..plz help me how to
If you don't have access to download mode, then you'll need to flash the laf.img file specific to your phone. If you can't locate the LAF image, then you'll need to extract it from the KDZ. Here's a tutorial on how to flash the image...
Tutorial| Fixing "Fastboot mode started"
http://forum.xda-developers.com/lg-g3/help/tutorial-fixing-fastboot-mode-started-t2995854

H731 Flash Problem

H731 Flash Problem
Show Lg H736p (Main Board Model)
in Setting H731 Model
i Flash The Phone reason Virus In Phone
but Phone Not Goes To Download Mode
try To Download Mode than The Phone Goes To Black Screen
and show
"[730] udc_start()"
phone in fastboot mode in Divece manager
than I try laf.img (Extracted From Firmware)
Writing laf Also Error
"writing 'laf'...
FAILED (remote: unknown command)"
so please help me ! how i can Flash My phone.

1 Stuck in fastboot - lock state: Locked / Lg v400

hello, so after trying to flash stock lollipop something went wrong and now can't access download mode, i tried to flash laf.img but i can't flash anything using adb, plz help.
When in fastboot mode:
Code:
fastboot flash laf laf.img
doesn't work?
I've restored download mode on a V410 before that way just to see if it would work, and it was successful. I nuked my laf partition intentionally because we didn't use to have a kdz for the V410, and I thought it would be easier to recover the tablet with fastboot available than a useless (for the V410 without a kdz) download mode.
jason2678 said:
When in fastboot mode:
Code:
fastboot flash laf laf.img
doesn't work?
I've restored download mode on a V410 before that way just to see if it would work, and it was successful. I nuked my laf partition intentionally because we didn't use to have a kdz for the V410, and I thought it would be easier to recover the tablet with fastboot available than a useless (for the V410 without a kdz) download mode.
Click to expand...
Click to collapse
Thank you for the replie, no, every time i trie to flash something or unlock the bootloader i get this message : failed (remote: unknown command)

How to root M51 with magisk?

Hello,
can somebody tell me what i did wrong or where to find a guide on how to root the m51 with magisk?
What i tried was
- install magisk manager
- copy m51's AP file onto phone and install magisk into it using the manager
- flash the patched AP with odin
But after the restart the phone was in a bootloop sometimes displaying a menu saying that the system image could not be loaded with options to try again or to factory reset...
Also tried with just the boot.img from the boot.img.lz4 in the AP, extracted it using 7zip and a lz4.exe i found on github, patched that but then when doing "adb reboot-bootloader && fastboot flash boot patched_boot.img" I get a:
Sending 'boot' (16888 KB) FAILED (remote: 'unknown command')
fastboot: error: Command failed
Bootloader is unlocked, also tried with absolute path to patched file... really dont get it

TWRP remote image verification failed

PRODUCT NAME: GOOGLE Smaug
HW VERSION: 5
BOOTLOADER VERSION: Google_Snaug.7900.139.0
LOCK STATE: Unlocked
Hello. After doing the wipe of System, Data , Cache and Davlik..., I tried to install another PixelExperience ROM and it has given me an error of format as soon as start the installation on the TWRP and when the tablet restarting again at FastBoot I try to enter in TWRP again but give me the following error.
C:\ADB>fastboot boot twrp.img
creating boot image...
creating boot image - 16893952 bytes
Sending 'boot.img' (16498 KB) OKAY [ 0.419s]
Booting FAILED (remote: 'image verification failed')
fastboot: error: Command failed
So I can not enter the TWRP to install another ROM and the previous one does not boot, so when the tablet boot in normal mode, return again to wait for a FastBoot command.
Can you please help me?. I do not know what else to do
Thank you
Nobody can helpme with this error please?
I need to use TWRP again.

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