[Q] Theorical question about L9 P760 unbricking - LG Optimus L9 P760, P765, P768, P769

Hello everybody,
Fortunatly, my device is not in "brick" state but I would feel safer if I could have an answer to my question.
I flashed my ROM with the following method (the main purpose was to root my device with the Lelus method) :
http://forum.xda-developers.com/showthread.php?t=2085344
But, the only way I could get the LG Update Tool working was to have my device with Android started and USB mode to set "LG Software". Then, the LG Update Tool restart my device to "S/W Update" screen during its flashing procedure.
However, if I directly start my device on the "S/W Update" mode (by pressing Volume Down button while I plug through USB the device to my computer), the LG Update Tool refuses to see the device.
This issue could eventually happen if Android was not bootable (because of some human mistake, of course; it's my first Android device so I am a noob ).
Is there any known procedure to restore an unbootable L9 P760 device ? (for example, force LG Update Tool to recognize the device even if it was directly on "S/W Update" state)
Thank you for your answers and your time

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AW: [Q] Theorical question about L9 P760 unbricking
You must hold vol+ and insert USB for s/w Update.
Try the emergency mode with lg Update Tool.

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Thank you for your answer. I am sorry, I made a mistake in my post : when I said "Volume Down", I meant "Volume Up" . When I manually reached the "S/W Update" screen, it was by doing the good action .
Unfortunatly, even with "EMERGENCY" or "CS_EMERGENCY" mode, the result is still the same : the LG Update Tool refuses to perform a flash directly from the "S/W Update" screen. The output text is the following (in both "EMERGENCY" and "CS_EMERGENCY" mode) :
Code:
22:45:12 : [C:\LGMobileUpgrade] Try to delete folder
22:45:12 : RemoveDirectory1 Error(2):C:\LGMobileUpgrade
22:45:12 : Start Date : 2013-04-02 22:45:12
22:45:12 : ---------- QM Testmode ---------
22:45:12 : ***** Check Tool Version *****
22:45:12 : Tool version : 1.5.4.8
22:45:12 : UpgradeDLL version : 1.2.6.7
22:45:12 : Current Dir : C:\Documents and Settings\All Users\Application Data\LGMOBILEAX\B2C_Client
22:45:12 : LGE USB Driver Version : 4.9.8.1
22:45:12 : Android PDLV Version :
22:45:12 : Android NDLV Version : 3.8.0.0
22:45:12 : ******************************************
22:45:12 : [C:\Documents and Settings\All Users\Application Data\LGMOBILEAX\Phone] Try to delete folder
22:45:13 : SetEmerModeAT()
22:45:13 : _IsConnectedPhone Call
22:45:24 : _IsConnectedPhone(0)
22:45:24 : 0 - NotConnected.
22:45:24 : 1 - Normal connect success
22:45:24 : 2 - Emergency connect success
22:45:24 : *****CheckOS Start********
22:45:24 : Microsoft_Windows_XP_Professional_Service Pack 2
22:45:24 : *****CheckPCSyncPrograms Start*****
22:45:25 : PCSyncPrograms Not Found - OK and ready to upgrade
22:45:25 : Checking the connection with the cell phone...
22:45:25 : dwWaitResetTime(40000 ms)
22:45:26 : _IsConnectedPhone Call
22:45:35 : _IsConnectedPhone(0)
22:45:35 : 0 - NotConnected.
22:45:35 : 1 - Normal connect success
22:45:35 : 2 - Emergency connect success
22:45:36 : _IsConnectedPhone Call
22:45:45 : _IsConnectedPhone(0)
22:45:45 : 0 - NotConnected.
22:45:45 : 1 - Normal connect success
22:45:45 : 2 - Emergency connect success
22:45:46 : _IsConnectedPhone Call
22:45:55 : _IsConnectedPhone(0)
22:45:55 : 0 - NotConnected.
22:45:55 : 1 - Normal connect success
22:45:55 : 2 - Emergency connect success
22:45:55 : [009,400,102,102,102]The USB cable and your cellphone are not connected.\nPlease connect your phone and wait for connecting \nthe USB port for a while and press the [009,700,147,062,092]'Restart'[009,400,102,102,102] button.
22:46:05 : Check Cancel button active..
I tried to unplug and plug again the phone after 10 seconds (as it is advised in the unbrick totorial to force driver installation) : the result is still the same when I click on "Restart" from the update tool. In addition, I don't understand how it could be a driver issue : there is no unrecognized device on my Windows drivers manager and I am able to perform a flash as long as I start from a booted Android with the right options (the LG Update Tools restarts itself the phone in "S/W Update" and it works : the strange part is that during a more advanced update process step, while the phone is in "S/W Update" mode, my Windows pops up a found new device panel, but even if Windows doesn't find any valid driver, the update process continues and the result is right).
Do you have any other idea about this direct flash through "S/W Update" mode issue ?
Thank you in advance for your answers

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S/W update mode in JB is broken.
To solve it you need to fastboot your phone and flash xloader and uboot from ICS.

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Thank you for your answer.
Yes, I forgot to mention it : my phone is running under the official V20B ROM (just a little bit modified with your trick :highfive: ) : I though the "S/W Update" mode was at a lower level (and the Android installation didn't affect it).
I saw a post on this fastboot tool but it's a little bit too "hard" to understand for a beginner like me :
http://forum.xda-developers.com/showthread.php?t=2119090
So I think I will check about this solution only if I have to (currrently, this is not the case so I am feeling lazy... :angel: )
The last thing I would like to know is if the solution you said requires some previous manipulations which can only be done from my device while it is bootable (such as memory dumps : I am thinking about PS3 hack scene where you must perform your own NAND dump because it is crypted and unique for your PS3 so nobody else can give it to you if you previously corrupt your NAND and you forget to dump it before) ?

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OperationNT said:
Thank you for your answer.
Yes, I forgot to mention it : my phone is running under the official V20B ROM (just a little bit modified with your trick :highfive: ) : I though the "S/W Update" mode was at a lower level (and the Android installation didn't affect it).
I saw a post on this fastboot tool but it's a little bit too "hard" to understand for a beginner like me :
http://forum.xda-developers.com/showthread.php?t=2119090
So I think I will check about this solution only if I have to (currrently, this is not the case so I am feeling lazy... :angel: )
The last thing I would like to know is if the solution you said requires some previous manipulations which can only be done from my device while it is bootable (such as memory dumps : I am thinking about PS3 hack scene where you must perform your own NAND dump because it is crypted and unique for your PS3 so nobody else can give it to you if you previously corrupt your NAND and you forget to dump it before) ?
Click to expand...
Click to collapse
Nope, there isn't anything unique about x and u.

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Hello Buddy,
I have just one question for you, Have you unlocked bootloader of your L9????
Because the problem you are facing is only result of unlocking bootloader and i also faced the same. If you unlocked the bootloader, then there is no any trick to relock it (Untill Now ....), but still you can flash roms and unbrick soft bricked devices............:good:

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AW: [Q] Theorical question about L9 P760 unbricking
Have you tried the original lg update tool? And there the emergency mode.
I had the same problem after downgrade to v10h.
I solved it with the lg update tool, not With the kdz updater.

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Hello,
@Lelus : thank you for your answer, I feel safer
@gdjindal : No, I didn't unlocked my bootloader, I just put the last LG update for P760 (JellyBean V20B, French region).
@ramrod : I just used the tool and the method provided in this post :
http://forum.xda-developers.com/showthread.php?t=2085344
I thought KDZ Update loads "LG Update Tools" throught the created "Small HTTP Server" when I click on the "Web update" button. Is there any other tool ?
Thank you for your help

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This is the original lg tool. LGMobile Support Tool
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yes kdz loads the update tool, but it can´t detect the phone.
Try the original program, but undo changes in the host file.

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i bricked mine to the point of it saying security error. what you do is press power and repeatably press vol up it will get out of the brick loop and go into sw update from there you can use the unbrick guide/flash.

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you can also try a hard reset.
power off the phone,
hold volume down and home button
then press / hold the power button.
this helped my wifes phone out of a bootloop.

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ramrod said:
Have you tried the original lg update tool? And there the emergency mode.
Click to expand...
Click to collapse
I just tried it and you are right, ramrod : the original LG Update Tool recognize the phone even when it is on "S/W Update" screen from the begining, it can also perfrom fine an update !
So, the "S/W Update" mode is not broken since JB Update, it is just the way to communicate with it which has changed; and current known offline flash method is incompatible with those changes .
To have an offline method which is compatible with the new "S/W Update" mode behavior, it would requires some reverse-engineering on how the "LGUserCSTool.exe" (which is, I think, the final executable which performs the update) is executed (arguments given at its execution, environement variables previously set by its parent process, inter-process communications).

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AW: [Q] Theorical question about L9 P760 unbricking
Perhaps,its possible to copy the cp and ap files manually, after download with LG update tool, timely to the extracting process.
One rooting method used this.