[LG Optimus L9 P760, P765, P768, P769] pinoyto:
Unlocking the bootloader on p769 is DIFFICULT, the most difficult part is working with the touch screen which is wonky during this process. I highly suggest that we wait for LG's latest Jelly Bean for p769 instead of doing this, but if you are wanting to experiment like me, then read on.

Please note that every boot will ALWAYS have a mirrored image after doing this procedure.

First and foremost, thanks to Lelus for helping me through the process. Second, you need to be very familiar in flashing KDZ offline with this procedure (thanks cmahendra)

http://xdaforums.com/showthread.php?p=36351786p://xdaforums.com/showthread.php?p=36351786

1. Download this link to get p760 20B Europe open and flash it on p769 using the KDZ offline method.

http://csmgdl.lgmobile.com/swdata/WDLSW/LGP760/ANEUWH/V20b_00/V20B_00.kdz

2. After flashing you will notice you have two issues...Mirrored Image and Wonky touch screen. Mirrored image can be easily remedied by using a mirror to read the screen better. The Touch screen issue is the most difficult because after flashing 20B, we need to enable USB debugging in developer options. (thanks cmahendra)

Wonky Touchscreen:

This is how I got through the wonky touchscreen. Imagine putting a line in the middle of the screen crosswise (or like dividing the screen crosswise), you have to top screen and bottom screen. The Imaginary line would be the bottom of the top screen and the BOTTOM of the bottom screen (like the bottom screen's bottom is in the middle of the screen and the top of the bottom screen is in the bottom of the whole screen). It takes some practice but you will get it.

Make sure you face a mirror with your phone to get around the mirror imaged.

3. OK, now you have to go to Settings --> Developer Options ---> and tick USB debugging (You can also tick "Show touches" to make it easier).

4. LET YOUR PHONE STAY ON FOR 30 minutes or more (Very Important or you won't be able to unlock your bootloader). Then connect your device to PC and type "adb devices" and make sure your p769 is seen by the computer. Then type "adb reboot oem-unlock" This will reboot your device and send you to a "mirrored" confirmation screen. Basically just press Volume UP button to confirm unlock... then it will send you to fastboot, you can just press the power button for 10 seconds and reboot.

5. After rebooting, you need to flash 10G kdz back, in my experience, the offline flashing method by booting to SW mode did not work... It hanged up at 15% and said my device is not connected to USB. The only way for me to flash 10G KDZ back was to boot in JB (mirrored) and then instead of Emergency Mode, I used DIAG mode while the device is connected to PC. Only then was I able to flash back to 10G.

6. After flashing 10G KDZ, you won't be able to boot. Turn it off and do a hard reset (Power button + Volume UP + Menu Button).

7. Upon reboot from 10g, you will still have the mirrored image, but if you press the power button and turn it back on, the mirrored image will be fixed. Then comes the wonky touch screen. Beside from having the wonky touch screen you will notice that the whole left and right side is also inverted which makes it very difficult but doable with practice.

8. In 10G, we need to enable USB debugging again, then root the device with this procedure

http://xdaforums.com/showthread.php?t=2171243

(Remember to use DIAG mode in reflashing 10G for the second time in rooting the device)

9. After rooting the device, we need to fix the touchscreen with this (Post #24)

http://xdaforums.com/showthread.php?t=2182867&page=3

and go to post #24..

That's it :) AGAIN, I highly suggest we wait for JB for our devices instead of this.

If ever you want to overclock your GPU at 384, here is a link to do that..

https://www.dropbox.com/s/ofuijfgx4e694gl/bootoc.img

Goodluck :)