Thank you very much for the contribution of the software.
I wanted to ask in general if anyone knows if with this software I can solve this problem:
"secure booting error cause boot certification verify"
I have two LG sipirit H440 4gLTE c70n.
One gets that error, "secure booting error cause boot certification verify" and it shuts down immediately.
And the other one has an error that says CMD12 fastboot ini () error, this one is recognized by the pc, identifies it in the USB port, and lets me work with Fastboot Tools, but it only recognizes the command: fastboot devices.
Try to read variables, try to flash partitions, images and also boot from the image, nothing just ends in: error command failed.
If someone helps me, I was investigating a little that with SPFLASH Tool, you can rewrite the internal nand memory but I do not know if it is the method that I should use, I do not want to make the situation worse.
The dowload / emergency mode does not work (I tried hanging upside down from a tree with no luck).
I'd appreciate your help.
