yashsingh1/xdaforums huggingface dataset:
[LG Optimus 4X HD] EB20XY:
Have get an new P880.

Successful rooted already.

Android version is still 4.0.3 with softwareversion v10h.

But I have problem with unlocking the bootloader.

If I send "adb reboot oem-unlock" it comes to a reboot,

but no special message comes up.

What shall I do now ?

(all in one tool, say success)

But I can't see any entry with "3845#*880#" to check it.
[LG Optimus 4X HD] Flying_Bear:
Upgrade to jellybean
[LG Optimus 4X HD] pull.me.under:
I've tried unlocking my newly bought (but used) phone following the procedure detailed in the first time. No matter which way (official or batch file) I try, I always end up merely rebooting the phone, without any BL changes. After reading the last few posts, it seems I first have to upgrade to some version v20a (I guess I'll be able to find info about that once I look into it), but please, [MENTION=4716493]laufersteppenwolf[/MENTION], could you update that info in the first post? Also, could you include how I as a noob user can find out the currently installed software version, and what kind of device (262-000, ...?) I have?

Thanks for all the good work!
[LG Optimus 4X HD] dimi89:
Dont want to lecture you but your problem is already covered 999 times..You need to update to 20a Euro-Open ... For current software version go to > settings >About phone and there you will find all your answers...
[LG Optimus 4X HD] pull.me.under:
Dear dimi89, thanks, maybe I wasn't making myself sufficiently clear. I saw that the problem was known and the solution has been posted, only a few posts previous to my own. I was trying to point out that such info is not easy to find, especially for newcomers. As far as I can tell, there is no single post stickied somewhere that says "Listen guys, current situation: V20a is the current beta software (install instruction see _here_), it's been published by LG merely for devs to play with, Boot Unlock via this or that method works ONLY for v20a (instructions are _here_), you need Boot unlock for this and that." Honestly, forums are great, and the answers are nearly always there, but if I have to wade through 50 pages of comments to happen onto information that's essential for me to start understanding the current situation, you'll have to forgive recurring posts of this kind.

Of course, I might just be stupid and there is a central point for exactly that kind of information? If so, I didn't find it in the Index or important stickies thread.
[LG Optimus 4X HD] dimi89:
Ofcourse that you are not stupid.Just before do anything go to last page of that thread and read 5-10 last pages and you will 90% find answer there.For example : You see rom you like go to last page and go backward and read posts you will find all advantages/bugs for that rom.
[LG Optimus 4X HD] pickled-onion:
Following your instructions, I get to the point where it says DOWNLOAD MODE !!! but then everything stops. How long is it meant to take?
[LG Optimus 4X HD] dimi89:
Honestly i dont understand you...Are you talking about flashing KDZ 20a file or ?
[LG Optimus 4X HD] pickled-onion:
Sorry, as you can tell I'm a noob. Apparently, I didn't have the right drivers installed, so when I tried to unlock my P880 it would hang on the screen where it says download mode above the LG logo.
[LG Optimus 4X HD] dimi89:
You are trying to upgrade to 20a Open Euro ? If yes this isnt appropriate section wher you should post about that.Long story short try disabling LG Modem in device manager and try again. For more info go to updata software section please.
[LG Optimus 4X HD] pickled-onion:
Can anyone give me a download link for KDZ 20a file?
[LG Optimus 4X HD] SimonTS:
Lg Optimus 4X HD
[LG Optimus 4X HD] pickled-onion:
sorry for being a hopeless noob, but how do you install fastboot? When I execute the install.exe file, nothing happens :(
[LG Optimus 4X HD] ariton1:
When I open adb.exe or fastboot.exe it immediately closes... Why? I think I've done everything correctly except those drivers which I think I installed them previously but I don't know if I've ever installed fastboot drivers!? Please help me, or at least link me to fastboot driver download so I can download them, I've also searched for the drivers but I couldn't find any, even on the LG Optimus 4x HD section of this forum, which annoys me. Help me. Thanks!
[LG Optimus 4X HD] Spunkiii:
adb and fastboot aren't meant to be 'opened'.. You should open up a command window and run the commands from there..
[LG Optimus 4X HD] Sofikul:
Bootloader unlocked but when checked says ''lock''???

Hi

I have just bought a optimus 4x hd which was on ics and i manually updated it to jellybean v20a

Need HELP! The BL UNLOCK.BAT DOES WORK FOR ME USING THE FASTBOOT METHOD, I GET THE OPTION TO UNLOCK THE BOOTLOADER AND IF I PRESS YES IT SAYS BOOTLOADER UNLOCKED AND THEN A BLANK SCREEN, ONCE I DISCONNECT AND THEN CHECK ON PHONE THE BOOTLOADER STATUS, IT SAYS ''LOCK'' so i dont know if it unlocked it or is it still locked???

IF TRIED ALL THE METHODS AVAILABLE BUT TO NO AVAIL

THE FIRST METHOD I TRIED IT COULD NOT UNLOCK AND I THINK IT SAID ''ALL FUSED BLOWN''

ANY KIND OF HELP WILL BE MUCH APPRECIATED

Thank You Very Much
[LG Optimus 4X HD] Killah.inc:
I had problem to, to install the drivers to but i find a very easy way.

1, uninstall the LG suport tool and then reinstall it agien.

2, connect phone to computer.

3, open LG suport tool and from it uppdate/install adb drivers. (If u have drivers but maby wrong drivers uppdate, if u dont have drivers you install).

4, now u have the latest and right drivers on your device.

For me that worked very god....god luck :)
[LG Optimus 4X HD] Cheetah1024:
Lol... WHY ARE YOU SHOUTING??:D
[LG Optimus 4X HD] muellersmattes:
As I missed the last five months here, I am now a bit stuck with my new 4X. I ordered it from Germany, but apparently they sent me an Austrian Mobilkom device (at least that's what the IMEI chek says). Now there is a 232-01 JB version installed (apparently NOT the Mobilkom one, seems to be reflashed with a Euro Open.) On the package it says SWS, which is even more confusing. So, after all it turns out that I cant't unlock it the official way (I get the red "lge_security: Unlock denied" warning). And now i'm considering either to send it back to get myself a real german one or to unlock it with the "works-for-all"-method. Are there any disadvantages using this method?
[LG Optimus 4X HD] ashrafkhalaf:
Thank u for this tutorial

I am a newbie android user and this is the best and easiest way to work
[LG Optimus 4X HD] TheNoticer:
Thanks!
[LG Optimus 4X HD] john_0405:
I am sorry I posted in the wrong thread , how can i delete my post ?
[LG Optimus 4X HD] esmail69:
my 4xhd still in download mode (red) !!!
[LG Optimus 4X HD] laufersteppenwolf:
you need to ask a moderator to delete it ;)

you need a working fastboot environment ;)
[LG Optimus 4X HD] esmail69:
how can i find it?

i use BL-unlock_new.rar

sorry for my bad english

Thanks

adit:find fastboot driver . great
[LG Optimus 4X HD] ne0zone75:
Hello,

I own a LG-P875 (aka Optimus F5) which has been successfully rooted using motochopper ... Do you think that i can safely try your unlock procedure on it (or is specific for P880) ? AFAIK there's no recovery & no custom ROM's for my device at the moment but if the bootloader could be unlocked, it would be an interesting starting point ;)

Thanks in advance for your answers ...
[LG Optimus 4X HD] muellersmattes:
It's specific. I don't think it will work.

Gesendet von meinem LG-P880 mit Tapatalk 4
[LG Optimus 4X HD] ne0zone75:
You were right because i've tried the described procedure before you did post your answer AND my device just simply ... rebooted ! Nothing bad happened to mention here but nothing good either : the bootloader of my device is still locked !

Does anybody can tell me if there is any chance to know if the bootloader of my P875 is unlockable or not ? It's a quite recently released device (May 2013 in France) ... and i begin to doubt about that :confused:

Thanks for your answers ;)
[LG Optimus 4X HD] islam1710:
can this brick the phone if something went wrong?
[LG Optimus 4X HD] islam1710:
hey,i just ran the BL-unlock.bat in the attached file and then checked and it says it's unlocked. but it didn't reset or wipe any data. is it really unlocked? or have i done something wrong?
[LG Optimus 4X HD] theofficialpimp:
Same happened to me, I guessed its unlocked since I could install cwm and flash kernels.
[LG Optimus 4X HD] muellersmattes:
It's fine, that tool just blows the fuse to "unlocked". No further action necessary.

Gesendet von meinem LG-P880 mit Tapatalk 4
[LG Optimus 4X HD] Compwxr:
Guys, one simple question, if I unlock the bootloader, is there any way to get it locked again?
[LG Optimus 4X HD] SimonTS:
Are you capable of reading, or just too lazy to do so?

And, before anyone says it, I know it's taken me much longer to type this than to simply give you the answer :thumbup:
[LG Optimus 4X HD] kalel29:
Hey man,im searching for a way to unlock the bootloader for an LG p714 aka LG optimus L7 II,the only thing is that i dont know how to put the phone in fastboot mode,maybe some of you guys can help me.

Thanks
[LG Optimus 4X HD] ypkonline:
I have just picked the 4x HD yesterday.. i have rooted the phone

to run the bootloader do we need to have ADB installed and i wanted to check if my data is lost.
[LG Optimus 4X HD] popy2006:
THANKS MAN!

This worked for me, i am on 232-10

After chmoding the odm_reserved adb reboot oem-unlock worked!!

Then i have flashed TWRP and ill could enter it without the permisson denied message.

thx a lot

pOpY
[LG Optimus 4X HD] firedrag:
updated bootloader unlock script

Because a few owners of the lg p880 seem to have similar problems with the permission denied failure in the script (look at post http://xdaforums.com/showpost.php?p=41975483&postcount=459), I added the permission changes to Laufersteppenwolfs script.

[MENTION=4716493]laufersteppenwolf[/MENTION] hope its not a problem for you. I marked my changes in the script.
[LG Optimus 4X HD] popy2006:
Thanks, i will post it in the "android hilfe" forum, because i have seen there where also some guys with this problem.

thanks a lot

pOpY
[LG Optimus 4X HD] Skrba:
how long should it take to unlock bootloader?mine just stayes at DOWNLOAD MODE and thats it,then when i unplug the cable it says that is formatting partition but it never gets finished,no done how it should write.
[LG Optimus 4X HD] popy2006:
Does your device manager have an fastboot device with an yellow triangle?

If yes, install fastboot drivers for this device.

best luck

pOpY
[LG Optimus 4X HD] dimi89:
Try doing it in linux since it is 80% easyer and drivers cant **** up anything like they can in windows. When i saw tutorial for linux i didnt even want to try unlocking it in windows since i know what problems can couse by drivers malfunction.Also you dont have to bre brainiac to do it in linux (i am not and still i done it with official LG method)
[LG Optimus 4X HD] alexies24:
heeeelp!

Please help. Ater I type adb reboot oem-unlock, my o4x just reboots and nothing happens.

And another thing, there is no "Bootloader unlock check" menu in the hidden dialer code. :(
[LG Optimus 4X HD] sagpatel:
i used the tool to unlock the bootloader, worked for me.
[LG Optimus 4X HD] dbt0210:
Did it tell you on the boot screen that your device isn't unlockable? Because thats what happened for me. The other method worked though :)
[LG Optimus 4X HD] kessaras:
this bl_unlock method for me is stuck at line "adb wait-for-device" . when i come to choose between 1 or 2 or 3 , i cant do anything. vol down/up not responding. the terminal is waiting for device and thats all. all i can do is reboot my device and try again.... any ideas ? other ways didnt work for me. i tried many scripts, i tried the uniflash tool , i tried the "all in one" tool someone made here, i tried every way i could find here and even tried manually from phone terminal. my phone is on 4.1.2 20b. And if there is not a way to unlock the bootloader , has anyone tested the option to downgrade to 20a and unlock ?
[LG Optimus 4X HD] bcrljen:
this is how it suppose to be done

I also lost hours to find info that is suppose to be sticky so I agree 100 %
[LG Optimus 4X HD] firedrag:
Maybe your try this script. Sound similar to my Problem:

http://xdaforums.com/showpost.php?p=45602279&postcount=544
[LG Optimus 4X HD] nasosgr:
Hello all

I have a big issue with my optimus 4x and i need help.

I wanted to update the default recovery of android 4.1.2 with the clockwork recovery. I downloaded the rom manager from google play, then tried to flash the new recovery. The pocedure said it was complete, but after that i realized that my boot loader was locked. Now every time i press power+vol down button to get to recovery mode i get an error saying wrong signature and there is no way to get into recovery mode.

I tried Hard reset but nothing changed to the recovery ,still gives an error. Can you please tell me how to roll back to the old recovery, or fix the existing?
[LG Optimus 4X HD] SimonTS:
Search and read before asking things mate. This exact question has been asked by about 3000 people already when they are too lazy to read the instructions properly. :banghead:
[LG Optimus 4X HD] SnXo:
Do flash your mobile like the method thats explaind http://xdaforums.com/showthread.php?t=2179126 <––here! This should solves your problem with unsigned bootloader... after that unlock your bootloader like the method on this thread ...

Good luck

Best regards

SnXo
[LG Optimus 4X HD] smonist:
so this works with stock ics or not? sorry for beeing dumb.
[LG Optimus 4X HD] SimonTS:
You're not being 'dumb', you're just being too damn lazy to bother reading first. Hopefully you will continue to not read, rely on asking questions, break your nice shiny phone and have to buy a new one because you're still too lazy to search and read!! :rolleyes:
[LG Optimus 4X HD] Cheetah1024:
Think! To flash a custom rom, you need an unlocked bootloader... Sooo......?

Sent from my LG P880
[LG Optimus 4X HD] GalaxyVolvoZ:
Boar only JB have Bootloader which can be unlocked. Go and brick your phone on ics
[LG Optimus 4X HD] smonist:
thanks for the straight answer.
[LG Optimus 4X HD] adamdbz:
p88020b-466-92

Can i unlock? i'm on p88020b-466-92

Thank you
[LG Optimus 4X HD] SimonTS:
Why don't you just try out and find out?
[LG Optimus 4X HD] adamdbz:
I did ,evrey time it would reboot and than nothing.
[LG Optimus 4X HD] Brow71189:
YOu dont have to rollback to V20A. I just unlocked my bootloader and I have V20B running. Just try the official method and see if it works.
[LG Optimus 4X HD] brunek:
Will this method work on my Win XP? Someone said to me that opening terminal might be different on Win 7 an Win XP.. On Win 7 is "SHIFT+RIGHT MOUSE CLICK on Root folder and click open command window here". Is that on Win XP also?
[LG Optimus 4X HD] muellersmattes:
To open a terminal you simply click your start menu and select "run" and type "cmd", or you select "Command Prompt" from the start menu. It's been like this ever since Windows 95...
[LG Optimus 4X HD] BBorrisR:
When I type adb reboot oem unlock everything is good..it says it's started successufully, phone turns off but then phone just shows battery(chaging animation)..I've chaged it to 100% but still nothing, and also tryed with BL_unlock file and the result is same..please help me to solve it

[EDIT]

WOW now it says in secret menu that bootloader is unlocked... Is that possible!?

custom ROMs ^^
[LG Optimus 4X HD] botros70:
problem ,, never unclock !!! don,t know why ?

I HAVE BEEN TRYING ,, & I NEVER GET THE FINAL MESSAGE ( dONE , NOW rEADY ) ... ALWAYS STOPPPES @ ( UNLOCKING THE BOOTLOADER FOR THE 1ST TIME , PLEAS WAIT .)

---------- Post added at 04:28 AM ---------- Previous post was at 03:56 AM ----------

well ,,, thanks any how .... i did it with the methode mentioned here http://xdaforums.com/showthread.php?t=2263627
[LG Optimus 4X HD] goldfinv:
worked great for me. many thanks
[LG Optimus 4X HD] flower78:
thanks

Thank you very much!

I have managed to unlock my bootloader with the second method. It took about 1 minute :)
[LG Optimus 4X HD] laufersteppenwolf:
You're welcome, but please avoid quoting the entire OP next time ;)

Thanks :)
[LG Optimus 4X HD] markan666:
how long should the second method take?

i've downloaded the BL-unlock_new zip, connected my phone via USB (after which drivers got installed on my pc) started BL_unlock which said press any key to continue and now it says for about 5 minutes unlocking now... and nothing else happens?
[LG Optimus 4X HD] laufersteppenwolf:
You need a proper fastboot environment ;)
[LG Optimus 4X HD] markan666:
and of course i have no idea what proper fastboot environment is :eek:
[LG Optimus 4X HD] laufersteppenwolf:
Just search for fastboot in our 4x HD section ;)
[LG Optimus 4X HD] theduardo:
Hello, i'm having problems at unlocking my bootloader. I do everything as its explained but when i write down the code 'adb reboot oem-unlock' the phone restarts and at the initial LG logo i got some red words on the top of screen saying something like

'Lge security access unlock denied

'.

What am i doing wrong?

thanks
[LG Optimus 4X HD] black@pirate:
Read the last part of first post. There should be an attachment. Run it while ph is in adb mode. It should work.
[LG Optimus 4X HD] theduardo:
So i connect my phone in adb mode, open the folder BL_unlock_new and run the adb from there?

i tried doing this but when i turn into recovery mode (pressing vol- and power) i get a message saying: ERROR: boot image signature.

what the hell is happening?
[LG Optimus 4X HD] laufersteppenwolf:
you get the error because you've disconnected your device, that's normal.

and don't forget, this is not the official unlock method ;) so the chances of success are nearly 0
[LG Optimus 4X HD] Timbol.:
Same by me :/ And i havent disconnected it!
[LG Optimus 4X HD] alekthefirst:
Mine hangs on the factory reset thingy

And yes; i have the euro open version
[LG Optimus 4X HD] avi3230:
So I cant unlock???

Actually I am from India and I used euro open Kdz file for flashing.

I am using sim card from India.

Is that the reason for the message.

But if u see the message carefully it shows bootloader in unlocked.

but after booting normally and going in hidden menu it shows locked???

Any solution.

Thanks in advance.
[LG Optimus 4X HD] tonus76:
Is the warranty void after bootloader unlock.
[LG Optimus 4X HD] xxalexcc:
Yes

Gesendet von meinem LG-P880 mit Tapatalk 2
[LG Optimus 4X HD] rhapsodize4452:
Had the same issue with Download Mode!!! Freeze and after plugging out the USB cable freezed at please wait..

Tried formatting/factory reset from the recovery mode and ended up getting screwed. After entering the Setup details initially, I get the error message

"Unfortunately LGSetupWizard has stopped" Tried wiping cache but in vain...

I can't get in.. :( Please help..
[LG Optimus 4X HD] peppethustra:
Guys, did you.try with full charged battery..? I mean, at 100% ? I had your same problem, at the beginning, then with full charge I unlocked my device (eur-xxx, mine, but maybe yours will be unlockable with 100% battery, even if no eur-xxx..)
[LG Optimus 4X HD] teddyxfire:
As mr. laufersteppenwolf said, it's normal to get black screen after doing this unofficial way of unlocking - and that error message after disconnecting your USB is not dangerous, so don't worry. When the screen goes black, all you need to do is to take off the battery and then put it back in. After that, turn on your phone and voila. You can check if the bootloader is unlocked under service menu - type 3845#*880# -> go under "Bootloader Unlock Check" -> see if it says "Unlock"

---------- Post added at 11:49 PM ---------- Previous post was at 11:41 PM ----------

My speculation is that the official method did not work because of the missing drivers, which you had to install if you've followed my post :) You can retry this unofficial method until it works, I read that not everyone managed to unlock it from the first try...or, since we've installed all drivers, you can try this official method one more time.

---------- Post added at 11:54 PM ---------- Previous post was at 11:49 PM ----------

Just reflash the whole ROM via LG PC Suite ;) You can find & re-download the official JB here: http://xdaforums.com/showthread.php?t=1991284 and you can install it by following this thread: http://xdaforums.com/showthread.php?t=2134192
[LG Optimus 4X HD] k9r:
To answer that question with a simple "yes" is not correct.

The subject is much more complicated. It can depend on where you live, where you bought the device, what the issue is and how long you had the device to name just a few parameters.

For more details on the matter I can recommend reading these articles:

http://piana.eu/root

http://android-revolution-hd.blogspot.de/2013/03/unlocking-bootloader-or-flashing-custom.html
[LG Optimus 4X HD] WillySonicteam:
First install the fastboot:

http://www12.zippyshare.com/v/5786485/file.html

and copy the adb folder in a directory:

http://www12.zippyshare.com/v/90436494/file.html

in the adb folder open the cmd.exe

tutorial by laufersteppenwolf

1. Turn on the phone with SIM card, and wait for connection to the real network.

2. Wait for couple of hours.

3. Connect your handset to local PC with USB cable.

4. Enter "adb reboot oem-unlock" in DOS command window.

5. Reboot handset and you can see the bootloader unlock guide on your phone.

6-1. If you press volume up key, handset is bootloader unlock status.

You can download custom image using fastboot command.

6-2 If you press power on key, user doesnot accept unlock bootlaoder and handset normally power on.

7. you see this image in your phone

http://xdaforums.com/attachment.php?attachmentid=1861354&thumb=1&d=1365201659

Later, push the power button a seconds,the phone restarts.

This method works perfectly on my phone EURXXX
[LG Optimus 4X HD] thecresta:
Tried this method on 234. All worked as described, ensuring battery is always at 100%, but after turning the phone on again the bootloader status in the hidden menu is still 'lock'.
[LG Optimus 4X HD] brunolmd:
Hello guys,

I tried this method but I get the "permission denied" message too.

Is there a way to unlock 724-06? Brazilian device.

Thanx in advance
[LG Optimus 4X HD] fire3d:
i think with "real network" they mean the mobile network?

Also, a couple of hours, that's really a bad "how to" from LG :)

Can anyone from here post how many hours he has waited before unlocked it succesfull?

Thx
[LG Optimus 4X HD] roger321974:
1. i dont know, i think twice mobile and wifi

2. i have heard about 13 hours, i think it can be from 12 up to 24 hours
[LG Optimus 4X HD] profyler:
so it should make a hard reset if procedures went ok?
[LG Optimus 4X HD] rhapsodize4452:
Spent hours trying to unlock!

After getting freezed at Download Mode!!! I decided to throw away the idea of unlock, rebooted phone to find out I can't get past the setup screen. As per the OP's advice decided to flash it again. After restoring all the backups, rooting etc. Found the new method to unlock from needoo. So decided to have one last go with updated fastboot drivers. that didn't work out too and phone went unresponsive and blank just seconds after getting the unlock or lock option from fastboot. Removed battery and restarted phone to find out that I can't get past the setup again.

So now I am trying to flash kdz again. But on the s/w updating screen I get "Unlocked Bootloader"

But kdz update tool shows.. Phone Cannot be Found. Going crazy right now....
[LG Optimus 4X HD] ronhoover88:
For kdz update tool to find your phone, make sure you've disabled the modem from device manager