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Hi,

First of all, i have no credit for almost things i'm gonna say here, thanks must go to who realy worked in the mentioned things.

I created this thread because of the large numbers of people in [Q&A, Help & Troubleshooting] and realized that the most of these problems could be solved with a simple guide. I repplied this in a thread but now i'm creating in general with hope that people sees this before asking again.

This guide can be used in these cases:


- Phone is not recognized by KDZ offline flashing
- Phone enters in SECURITY ERROR screen and doesn't boots up
- Fail trying to flash a new ROM and the phone doesn't starts
- You tried to install custom ROM via CWM and your phone have a LOCKED bootloader
- You tried to install a custom recovery via fastboot/adb and your phone have a LOCKED bootloader
- Anyway, if you think your phone is dead, give a try here


When you try to install a custom recovery with your bootloader locked (for example), the phone system detects it and give you a message of an error in security. To solve this, you'll need to reflash your rom. By doing this, the KDZ will reflash the original recovery and you will be able to access your phone/recovery again.

Step by step:

1. You need to install fastboot drivers: http://forum.xda-developers.com/show....php?t=2119090
Turn off the phone and remove the battery. Download THIS and exctract it to C:/. Open device manager in windows (Rigt click on Computer > Manage > Device manager) and connect your phone without the battery to pc via USB cable. Look in device manager for a new hardware connected, right click on it and click in update drivers. In the window open, select "Search for software driver in the computer" and in the window open select insert C:\fastboot\usb_drv_windows, tick the option "include subfolders" and advance. A pop up window may appear asking you if you do want to install the driver, choose YES and the drivers will install.

1.1 - If you're having some badtimes installing fastboot drivers, follow THIS, it will probably solve the most of the problems - thanks @kuma82 for catching it

2. Navigate to the folder you extracted (C:/fastboot) and double click on start.bat. It will ask you for administrator privileges, just say yes.

3. Select your phone model (2 for P760, 3 for P765, 4 for P768 and 5 for P769). It will ask you to turn off your phone and remove battery. When you done with that, press enter. It will now ask you to insert USB cable with the phone without the battery and after 4 seconds re-insert the battery. Onde you done with that, it wil return a message to press any key. In this step the fastboot drivers may be installed again. Don't worry, it's normal

4. Remove the battery again, wait a few seconds and re-insert it.

5. Plug the USB cable in the phone with the battery in and let VOL UP pressed. The phone will enter in SW Update mode.

6. Follow THIS to reflash your rom. A list of avaiable official roms of different models is HERE. Remember to only flash roms made for your phone model or you may get some issues.

7. You're all done I recommend using THIS TWEAK, the phone becomes more responsive.

*** If you flashed a JellyBean rom (V20X.kdz) you can easily root with THIS and if you want CWM recovery use THIS CWM FOR LOCKED BOOTLOADER ------ REMEMBER NOT TO FLASH ANY CUSTOM ROM WITH THIS RECOVERY BECAUSE I'M CONSIDERING YOUR BOOTLOADER IS LOCKED AND FOR THIS REASON, YOU CANNOT FLASH CUSTOM ROMS WITH CWM, IT JUST DOESNT WORK!!!


People who deserve thanks:
@sguerrini97
@cmahendra
@Dragusdrake
@captaincrook
@artas182x
@Lelus
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20th August 2013, 03:25 AM |#2  
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thanks for getting this together im sure it will help some people in need.
20th August 2013, 04:23 AM |#3  
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Not to hate or anything, but you should go into more details. I had a hard time at first because my computer wouldn't give me a chance to install the drivers (it kept disconnecting and connecting). Not every computer is the same, some people have to disable driver enforcement at boot to install omap4430 drivers. Just saying, but thanks for helping :thumbup:

Sent from my LGMS769 using xda app-developers app
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20th August 2013, 12:00 PM |#4  
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Quote:
Originally Posted by kuma82

Not to hate or anything, but you should go into more details. I had a hard time at first because my computer wouldn't give me a chance to install the drivers (it kept disconnecting and connecting). Not every computer is the same, some people have to disable driver enforcement at boot to install omap4430 drivers. Just saying, but thanks for helping :thumbup:

Sent from my LGMS769 using xda app-developers app

saw your post regarding this in one of the threads but lsot it.... mind sharing that?...i am getting unkown device in device manager whrn i try to install usb driver for omap
20th August 2013, 01:14 PM |#5  
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Quote:
Originally Posted by N3Ti

saw your post regarding this in one of the threads but lsot it.... mind sharing that?...i am getting unkown device in device manager whrn i try to install usb driver for omap

http://forum.xda-developers.com/show...8&postcount=34

http://forum.xda-developers.com/show...1&postcount=55 @Shutcrut you are welcome to use this info in your OP.
I wish some moderator will sticky this stuff.
Sent from my LGMS769 using xda app-developers app
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20th August 2013, 03:52 PM |#6  
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Quote:
Originally Posted by kuma82

http://forum.xda-developers.com/show...8&postcount=34

http://forum.xda-developers.com/show...1&postcount=55 @Shutcrut you are welcome to use this info in your OP.
I wish some moderator will sticky this stuff.
Sent from my LGMS769 using xda app-developers app

Thanks kuma, i already put it into the thread.
Sorry i didn't go into details, i just took the information i gave to someone in asks threads and put it in here.

If you guys have problems in some point feel free to post here or send me a pm, i prefer post here your problems so other people can help us too
20th August 2013, 03:54 PM |#7  
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This guide will be helpful to many I'm sure. I think you should combine in wonky touch screen fix with v6 and cwm ts fix I've softbricked this phone so many times I'm back up and running in 15-20 mins but my bootloader is still locked

Sent from my LG-P769 using xda app-developers app
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20th August 2013, 04:00 PM |#8  
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Quote:
Originally Posted by omgbossis21

This guide will be helpful to many I'm sure. I think you should combine in wonky touch screen fix with v6 and cwm ts fix I've softbricked this phone so many times I'm back up and running in 15-20 mins but my bootloader is still locked

Sent from my LG-P769 using xda app-developers app

I will add more info about P769, i forgot because i don't have this model
Probably tomorrow i'll do this. I've soft bricked my phone a hundred times trying to unlock BL but no success.

@omgbossis21 if you need someone to test anything, i'm your man. I want to help with the ublocking process but i dont have much knowledge in these deep things
24th August 2013, 10:37 PM |#9  
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Thanks, but this method does not work for my p769.

Background info on device in question:
Quote:

I tried rooting my LGP-769 (originally 20f) using a bin and KDZ for 20d. Halfway through, the software (on the PC) crashed, and now my phone is stuck at "S/W Upgrade" screen. It no longer appears in device manager, and the LG software used for flashing does not see it as connected, so I can't flash anything back that way. Things that I've tried:

Hard boot: no change, still stuck at S/W upgrade
Leave battery out for 15 min: no change
Can't flash because device no longer exists in Dev Manager


Do I have any options here? What went wrong?

Thanks in advance. I've only been a smartphone owner for a week and I'm worried that I've already ruined my device.

I can fastboot, but after doing so and attempting to flash the KDZ I get an error that the phone is not connected:
Click image for larger version

Name:	Capture.JPG
Views:	346
Size:	72.7 KB
ID:	2211271

Even though the OMAP device (fastboot) is visible in device manager: Click image for larger version

Name:	Capture1.JPG
Views:	319
Size:	20.6 KB
ID:	2211272

Is there any way to rescue the device? I keep reading that p769 is almost always recoverable from soft-brick but I seem to be completely stuck. Thanks in advance.
25th August 2013, 03:17 AM |#10  
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Quote:
Originally Posted by quickfastgoninja

Thanks, but this method does not work for my p769.

Background info on device in question:


I can fastboot, but after doing so and attempting to flash the KDZ I get an error that the phone is not connected:
Attachment 2211271

Even though the OMAP device (fastboot) is visible in device manager: Attachment 2211272

Is there any way to rescue the device? I keep reading that p769 is almost always recoverable from soft-brick but I seem to be completely stuck. Thanks in advance.

Using the lelus fastboot script flash the 769 ics x and u. Problem solved everytime

Sent from my LG-P769 using xda app-developers app
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