[LG Optimus L9 P760, P765, P768, P769] elpuertorro:
Confirmed WORKED!!!

YOU SIR ARE THE MAN!!!

Worked like a charm after 3 days of trying this is what i did

I did the 1st time and got inverted screen but not the inverted logo and colors on it at boot, I tried and reflashed many times..........and...... nothing the first LG logo was normal including colors but everything else was wonky as should be colors and screen once booted.

.

Saw the post above from Lelus and so here goes what I DID THAT "WORKED FOR ME!

While still on the already ROOTED 20B.KDZ i went and downloaded xloader and uboot and followed the instructions

Unpacked to sdcard then issued the commands from a cmd prompt(ran as admin).

Then a Factory reset still on 20B. then did as Lelus posted and Bingo!!! Unlocked bootloader!!!!!!!

So here it is STEP BY STEP!

MAKE SURE YOUR ROOTED

1.Download and extract x and u to sdcard.

2.Open CMD Prompt, Issue commands 1 at a time and hit enter (copy paste below so you don't make mistakes) :

adb shell su -c busybox dd if=/sdcard/external_sd/p1.bin of=/dev/block/mmcblk0p1
adb shell su -c busybox dd if=/sdcard/external_sd/p2.bin of=/dev/block/mmcblk0p2

3.Factory Reset. <--- Double check Make sure USB Debug is ON and Show touches ON and USB connection is in Lg software mode

4.Flash 10GKDZ offline mode . <---- do not replace bin for root you will do this later

5.After you flash 10g you might get stuck on boot so we can do 2 things:

a.Press Power Button for 10 seconds, phone will turn off, then restart phone and see if it starts normally, if it did then go to step 6, if not go to "b".
​

b.Remove battery > re-insert battery > now do the 3 button HARD RESET. First press VOLUMEDOWN and HOMEbutton. Then Press Power button only for 3 seconds and release power button but dont release VolDown and Home button and KEEP PRESSING BOTH until you see a Bigger Green Standing Android.<--- Again after reseting double check and make sure USB Debug is ON and Show touches ON and USB connection is in Lg software mode​

6.Flash Euro open 20B ( This is what I DID in this step, i cheated a little and ONLY replaced the AP[11] meaning before flashing 20B I DID NOT run the Root L9 and after the flash DID NOT flash radio or root.

7.Waited 1 hr give or take No signal but sim was in, ran a CMD Prompt as admin and issued the "adb reboot oem-unlock" WORKED!!!

8.In the bootlader screen pressed up (this is were I did a little extra work but hey it worked) reboot phone.

9.Ran the Batch file "Root L9" in the RootLelusJB folder --> C:\RootLelusJB.

10. Rebooted Phone Go to Apps > SU > Update > Normal -- YOU MY FRIEND SHOULD HAVE A UNLOCKED BOOTLOADER NOW!

From here on just follow the video from the "fastboot unlock part" on. To get there I did used the "adb reboot oem-unlock" command again to bring me back to the fastboot screen, then install your fav recovery and flash your heart out!!!!!

**Remember to do this: Wipe Dalvik > Wipe Cache > Format system > Flash Rom or Back Up > Flash GApps and last flash P769 Touch screen fix FIX > reboot. (Do it in that order)

Now go back to recovery and flash the 20Fkdz u-boot to fix the inverted logo and your done! *Thanks Kuma82 (Honestly not sure if the u-boot can be flashed in the same process as the rest above or after what to flash it so as i did it last after a reboot and that's what worked for me that's how i'm posting it!)

ps: if anyone knows if it can be flashed in the same process as above when flashing the rom and apps and where in the order to flash letr me know so i can fix this.

Hope it helps some of you!!!! :fingers-crossed:

And now let's see what Rom I try first lol!!