the s / w upgrade does not pass 50% LG L9 - LG Optimus L9 P760, P765, P768, P769

Good evening, I have in my hands a smartphone lg p778g does not pass me the logo to light following a simple copy of the folder whatsapp internal memory to the microsd (it was blocked after you copy and to restart it and did not initiate more ... it stays in the LG logo when turned on and there does not pass.
I tried to hard reset with vol (+ or -) buttons + home + power but rather than get out the menu of recovery I get the doll android slept with a triangle exclamation and there is no way to enter the menu that tightening no buttons.
Then I looking for information online found the utility tool flash, did all the steps as marked, I installed the drivers perfectly, the PC detects me the phone without problems, but always in the middle of the update (put the mobile mode s / w upgrade ) 50% program lg cancel the process by saying that there has been an unknown error and try try again by disconnecting and connecting the mobile, but no way, I give retry to to try again and again it hangs at 50% and I jump the error screen again.
I wonder if there is some other program where you can do the hard reset this phone than by the official LG utility, or by microsd.
The operating system used is Windows 7 64-bit, disable the Windows firewall and antivirus and run as administrator utility tool flash lg 2014, but always the same. I also tried running the utility lg mobile support tool directly to you directly seeking the most updated for lg p778g firmware, but it's the same as using the lg flash tool 2014, the 50% of the upgrade stops and gives me the message error.
A greeting and I hope you can help me, I need the phone !!

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We'd need someone with a p778g. The problem may be be caused by the special branding of the phone, or an encrypted bootloader. Or the internal flash got completely cleared, partitions and baseband rom, which means a full brick. Otherwise flashing stock in D/L mode should work, even if anything else fails. But this goes mainly for LGs official tool working online. With the LG Flash Tool 2014 i had also problems.
I think both tools have to ways to perform the unbricking. Either with the phone put in D/L mode by the user (if Fastboot don't work on the PC), or by recognizing the phone (but with a still running system) via ADB, then auto-switching to Fastboot. And you should also be able to attach the phone when it's already in Fastboot mode. The latter methods don't work on both my systems under Win10. When my desktop pc had been upgraded to 8.1, i performed all servicing of the L9 with my netbook, which was still on Seven.
My last unbrick was months ago, and i don' t know what happens at 50%. It's something important, and knowing it may help to understand the nature of the problem(loss of contact between phone and pc before the actual process starts, errors during flashing...).
It could be like this:
-phone seems to get recognized by driver&tool, that is good
-image gets downloaded(only with the official tool)
-image gets temporarily extracted on the pc(both online and offline). I fear that by completing the extraction the 50% mark is reached, and that no actual writes to the phone can be performed.
And LG's stock recovery, which calls itself "service mode" or "s/w mode" can be mistaken for D/L mode. I'm talking about the D/L mode, which is also present with a custom recovery, but theoretically D/L mode, S/W mode and Fastboot could be used for unbricking

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lecorbusier said:
We'd need someone with a p778g. The problem may be be caused by the special branding of the phone, or an encrypted bootloader. Or the internal flash got completely cleared, partitions and baseband rom, which means a full brick. Otherwise flashing stock in D/L mode should work, even if anything else fails. But this goes mainly for LGs official tool working online. With the LG Flash Tool 2014 i had also problems.
I think both tools have to ways to perform the unbricking. Either with the phone put in D/L mode by the user (if Fastboot don't work on the PC), or by recognizing the phone (but with a still running system) via ADB, then auto-switching to Fastboot. And you should also be able to attach the phone when it's already in Fastboot mode. The latter methods don't work on both my systems under Win10. When my desktop pc had been upgraded to 8.1, i performed all servicing of the L9 with my netbook, which was still on Seven.
My last unbrick was months ago, and i don' t know what happens at 50%. It's something important, and knowing it may help to understand the nature of the problem(loss of contact between phone and pc before the actual process starts, errors during flashing...).
It could be like this:
-phone seems to get recognized by driver&tool, that is good
-image gets downloaded(only with the official tool)
-image gets temporarily extracted on the pc(both online and offline). I fear that by completing the extraction the 50% mark is reached, and that no actual writes to the phone can be performed.
And LG's stock recovery, which calls itself "service mode" or "s/w mode" can be mistaken for D/L mode. I'm talking about the D/L mode, which is also present with a custom recovery, but theoretically D/L mode, S/W mode and Fastboot could be used for unbricking
Click to expand...
Click to collapse
If i was you:
1) Enter in bootload mode using LELUS Method
2) Flash a TWRP 3.0.2 recovery
3) In TWRP recovery format all partitions
4) Install a custom rom
5) Enjoy