[LG Optimus 4X HD] LamerDuck:
[UPDATE]

Finally: the Bootloader unlock exploit: http://xdaforums.com/showthread.php?t=2245836 (every version)

1. Download and extract this attached zip-file for easy unlocking, if you are on 20a: http://xdaforums.com/showpost.php?p=40011764&postcount=1

2. activate USB debugging, connect phone to usb, doubleclick BL_unlock_edited.bat, wait and only press "enter" until everything is done.

3. boot phone, dial 3845#*880# -> check bootloader unlock

CONFIRMED WORKING!

and thanks for the effort everyone!

(if you are stuck on the fastboot-step, you probably need to install the fastboot drivers. instructions for that are at the bottom of this post)

Old post:

Well, at the moment it seems like only phones with the 20a firmware version EUR-XXX are able to get their bootloader unlocked.

The problem: Some phones won't flash to EUR-XXX, it _seems_ IMEI (or provider/carrier) dependent, to which firmware your phone flashs.

Until now (March, 20th, 2013) there are serveral confirmed unlockings of a model from the "unlockable" list by people living in unlockable countries/using unlockable carriers, but this can be IMEI related, too.

[UNLOCKABLE LIST]

So far:

unlockable: (Model taken from URL+IMEI output, see 1.)

ANEUWH

ATHABK

APOLBK

ACWTBK

ACWTWH

ASTLWH

ASWSBK

ABALBK

AGRCBK

AAREBK

ASEABK

ASEAWH

AITABK

AHKGBK

AFRABK

ANLDBK

ATCIBK

APRTWH

AHKGBK

6BRABK

ATURBK

not unlockable::

ADEUWH (flashes to 262-000) (some people with ADEUBK on german carriers o2 and telekom were able to unlock, but maybe IMEI related)

ADEUBK (flashes to 262-000)

AHUNBK (flashes to 218-05) (one confirmed unlock of a phone to EUR-XXX registered in Croatia)

AGBRBK (flashes to 234-000)

ASWSWH (flashes to 232-10) (one confirmed unlocking by LGaljo, who lives in slovenia)

AHASBK (flashes to 232-10)

ATMDBK (flashes to 262-01)

ACLPBK (flashes to 233-00)

6VIVBK (flashes to 724-06)

APRTBK (flashes to 268-01)

[PLEASE POST YOUR INFO]

To confirm this and to gather info for the developers, please post this data about your phones:

1. Firmware version before flash:

2. Firmware version after flash:

3. unlocked:

4. Label:

5. Carrier:

you get the info to 1: go to URL http://csmg.lgmobile.com:9002/csmg/b2c/client/auth_model_check2.jsp?esn=IMEI, klick on the link (copy&paste will not work because "..."), append your IMEI after the =. Firmware version is the string after "LGP880"

you get the info to 2: system settings -> phone info -> software information -> software version

you get the info to 3: dial 3845#*880# -> check bootloader unlock

you get the info to 4: Its printed at the back of your phone's box

you get the info to 5: your mobile service provider's name and country. something like orange, telekom, vodafone, etc.

I'll start with

1. ADEUWH

2. 262-000

3. no

4. DEU WHITE WHITE

5. Simyo/germany

:cowboy:

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

[UPDATE] LG said, the official firmware (in this case for 262-000) will be unlockable: click

In another mail LG support mentioned that unlocking is IMEI dependent: click

[LG SECURITY: denied]

If you get "security error: denied" after adb reboot-bootloader, you have to install fastboot drivers when your phone has rebooted and the LG logo is showing.

you should see a device "fastboot" with a yellow triangle in windows' hardware manager, this triangle needs a fix.

How-To for fastboot drivers is here: http://xdaforums.com/showpost.php?p=40033213&postcount=32

fastboot drivers are attached to this post: http://xdaforums.com/showpost.php?p=38953792&postcount=17

BEWARE: MANY PEOPLE DO IT WRONG!

-> You have to install the drivers with the option "search on my computer for drivers", if you dont do this, the old (not working) drivers will be installed over and over again!

Unlocking and rooting Legend

1. Update to JB 4.1.2 (LG PC Suite): http://xdaforums.com/showthread.php?t=2134192 [by postacik]

2: Rooting 4.1.2 (easy method): http://xdaforums.com/showthread.php?t=2180688 [by Enter_The_Love]

3. Bootloader unlock exploit: http://xdaforums.com/showthread.php?t=2245415 by laufendersteppenwolf and Derjan23

4. Downgrade to 4.0.3 (LG FlashTool): http://xdaforums.com/showthread.php?t=2179126 [by SnXo]

also big thx to Skydev for finding root, dexter_nlb for sharing his knowledge, kholk for the first real mod, and many others