>>> LG H791 Nexus 5X - bootloop, error flashing <<

[DundyTM]

Hi, mates.
I have LG H791 which is in bootloop state. At the start of the phone:
"Your device software can't be checked for corruption. Please lock the bootloader". And the phone restarts. So I've tried to flash the set through "download mode", but the PC can't "see" it. The phone can be seen only through "fast boot" mode. But in this mode Octopus tells me this:

--------------------------------------------------------------------------------
Checking data...OK
Platform: LG Qualcomm
Selected port: COM1
Selected model: H791
Reading info...OK
Mode: Fastboot
Model ID: bullhead LGH791 16GB
Device serial number: 01********
Hardware: rev_1.0
Bootloader lock state: unlocked
--------------------------------------------------------------------------------
Writing phone firmware without real necessity is at your own risk.

Downgrade may lead to phone damage!

Please, make sure the phone's battery is fully charged.
Disconnect all other devices from the computer (including phones, 
modems, etc.) and close all other running programs.
To avoid errors in the flashing process, use a clean PC (without any 
installed drivers for other Qualcomm-based devices).
You should not run any other programs or attach new devices to your 
computer during the flashing!
--------------------------------------------------------------------------------
Opening "lgh791at-00-v20a-nxs-jul-22-2016-16g-nrd90mfe-user+
0.oct"...OK
Initializing flash...Failed!
Performed by 2.7.7 Software version.

Any ideas to restore this phone, mates?

[Octopus box]

Hello.

If You can't put the device into Emergency Mode, most likely boot are is damaged. You can try to repair your device Software which support this device via eMMC or USB.