[GUIDE] Fixing Security Error / Other commom problems - LG Optimus L9 P760, P765, P768, P769

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/showthread.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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thanks for getting this together im sure it will help some people in need.

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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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kuma82 said:
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
Click to expand...
Click to collapse
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

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N3Ti said:
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
Click to expand...
Click to collapse
http://forum.xda-developers.com/showpost.php?p=44578108&postcount=34
http://forum.xda-developers.com/showpost.php?p=44653501&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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kuma82 said:
http://forum.xda-developers.com/showpost.php?p=44578108&postcount=34
http://forum.xda-developers.com/showpost.php?p=44653501&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
Click to expand...
Click to collapse
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

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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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omgbossis21 said:
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
Click to expand...
Click to collapse
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

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Thanks, but this method does not work for my p769.
Background info on device in question:
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.
Click to expand...
Click to collapse
I can fastboot, but after doing so and attempting to flash the KDZ I get an error that the phone is not connected:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Even though the OMAP device (fastboot) is visible in device manager:
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.

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quickfastgoninja said:
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:
View attachment 2211271
Even though the OMAP device (fastboot) is visible in device manager: View 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.
Click to expand...
Click to collapse
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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Hi. I'm able to install the drivers, and when using option 7 for jelly bean, the app gets stuck at <waiting for device> and the phone's screen shows a grey lg logo and the word fastboot in the corner, and there are strange vertical stripes at the bottom of the screen that don;t seem to go away anymore. I would appreciate any help

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Hi. I'm able to install the drivers, and when using option 7 for jelly bean, the app gets stuck at <waiting for device> and the phone's screen shows a grey lg logo and the word fastboot in the corner, and there are strange vertical stripes at the bottom of the screen that don;t seem to go away anymore. I would appreciate any help
Click to expand...
Click to collapse
The strange vertical lines will go away after awhile. Did you look at my my second post in this thread. You should check them out. Another thing, you need to use x & u for ice, if your are trying to use the offline flash method.
CM 10.1 P769
---------- Post added at 10:30 PM ---------- Previous post was at 10:25 PM ----------
quickfastgoninja said:
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:
View attachment 2211271
Even though the OMAP device (fastboot) is visible in device manager: View 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.
Click to expand...
Click to collapse
You did not state if you flashed ice cream x&u, you have it installed properly.
Another thing, how did your phone get into this state? What did you?
CM 10.1 P769

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cubemike99 said:
Hi. I'm able to install the drivers, and when using option 7 for jelly bean, the app gets stuck at <waiting for device> and the phone's screen shows a grey lg logo and the word fastboot in the corner, and there are strange vertical stripes at the bottom of the screen that don;t seem to go away anymore. I would appreciate any help
Click to expand...
Click to collapse
What model is yours? Mine is a P768 and its only recognized by KDZ offline method if i choose P768 ICS x loader and uboot
But seems like the drivers are not installed in windows, are you using Windows 7 ? If yes, try reinstall the fastboot drivers following the thread i link in first post, pluging the phone in another USB port of your PC. kuma82 wrote a very good thing about installing the drivers, they are also linked in first post, take a look there and tell us if problem persists

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I get to the fastboot on my l9 tmobile but it just keeps telling me to select phone model over and over again. it never gets me in fastboot on the computer.
i flashed a wrong rom and it just keeps telling me security error. it wont boot at all. i dont know what to do. Phone boots up into fastboot but doesnt show up on computer as fastboot. ive been trying to fix this for 2 weeks now.
Edit: i can get into sw upgrade on my phon but it shuts off in a while it never stays on.

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fastboot is to only allow the PC to format a partition after that you can go to sw mode make sure with the fast boot program you choose ICS u-boot xloader. after that completes flash using sw mode
I'd try a new PC if had to. I know on mine I had to use another PC. Ideally windows 7
Sent from my LG-P769 using xda app-developers app

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suicidalerik said:
I get to the fastboot on my l9 tmobile but it just keeps telling me to select phone model over and over again. it never gets me in fastboot on the computer.
i flashed a wrong rom and it just keeps telling me security error. it wont boot at all. i dont know what to do. Phone boots up into fastboot but doesnt show up on computer as fastboot. ive been trying to fix this for 2 weeks now.
Edit: i can get into sw upgrade on my phon but it shuts off in a while it never stays on.
Click to expand...
Click to collapse
You dont need to enter in fastboot. Run lelus fastboot script, select ics xloader and uboot for your phone model. It will say to you remove the battery and press enter, remove it and press enter. Then insert usb cable (im assuming you have fastboot drivers installed) and after about 2 seconds re insert the battery.
Now your sw update mode should stay on until your kdz update finish
And dont forget to run lelus script as administrator

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have followed all the steps stated but am having trouble getting into s/w upgrade mode.. in the last 5 hours ive managed to go into it twice by sheer dumb luck. am now very frustrated. another question- do i have to use the lelus script everytime i try to go into upgrade mode?

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suicidalerik said:
I get to the fastboot on my l9 tmobile but it just keeps telling me to select phone model over and over again. it never gets me in fastboot on the computer.
i flashed a wrong rom and it just keeps telling me security error. it wont boot at all. i dont know what to do. Phone boots up into fastboot but doesnt show up on computer as fastboot. ive been trying to fix this for 2 weeks now.
Edit: i can get into sw upgrade on my phon but it shuts off in a while it never stays on.
Click to expand...
Click to collapse
Try holding vol up and power with battery out. Hold it even after the s/w appears.
Sent from my LG-P769 using XDA Premium 4 mobile app

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diod66 said:
have followed all the steps stated but am having trouble getting into s/w upgrade mode.. in the last 5 hours ive managed to go into it twice by sheer dumb luck. am now very frustrated. another question- do i have to use the lelus script everytime i try to go into upgrade mode?
Click to expand...
Click to collapse
Try installing ICS xloader and uboot with lelus script instead of JB ones and try again

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will0899 said:
Try holding vol up and power with battery out. Hold it even after the s/w appears.
Sent from my LG-P769 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
I Recommend the same for you, try installing ICS xloader and uboot with lelus script and try again