yashsingh1/xdaforums huggingface dataset:
[LG V40 Guides, News, & Discussion] Redacted Kaos:
No matter what i do , ive flashed fresh kdz and made sure it was on slot a default.. i still cant get fastboot,.., sio unable to obtain root
[LG V40 Guides, News, & Discussion] NGOwner:
Fastboot is only available with the v35 engineering bootloader, or if laf_a (when using slot a) has been deleted previously.

The stock bootloader does not have fastboot available by default.

[NG]Owner
[LG V40 Guides, News, & Discussion] Redacted Kaos:
does LAF_a need to be deleted before loading the v35 bootlosfer... i just kleep getting the unable to boot screen,,,no matter what combo of keys or usb
[LG V40 Guides, News, & Discussion] whitedavidp:
Please:

1. Which model phone?

2. Which kdz flashed?

3. Does phone boot normally?

4. What did you do to get into download mode for flashing?

5. Do you get unlocked boot loader message upon power-up?

6. Have you tried going back into engr mode with qfil and install V35 bootloader?
[LG V40 Guides, News, & Discussion] Redacted Kaos:
LM v405ua.. Sprint

Current kdz is 405ua20e... Do I need to go to oreo {android 8??}

Phone is perfect right now I've put the regular bootloader back and flashed fresh with said kdz

For download mod I held volume + then USB

No I don't get a message about unlocked bootloader.. I could never get to fastboot to unlock it.. I wish I did.

Thanks for your help and I hope you can help me get rooted..

There isn't. Like a 3 time limit to attempting unlock of bootloader is there? I may have mis interpreted something I was reading on a Russian forum
[LG V40 Guides, News, & Discussion] NGOwner:
There are multiple steps and multiple threads to follow to do what you want. Chunk it. Do the bootloader first. Everything you need is right here in this thread. Just get the bootloader unlocked. Follow the instructions in the OP, read the comments made by me and [MENTION=4770959]whitedavidp[/MENTION] and others throughout this thread. Things about QFIL, and how to enter EDL mode, etc. Just get the bootloader unlocked first. That's the first step to getting rooted, and the only time you'll need fastboot (which is enabled via the v35 bootloader required to unlock the bootloader).

[NG]Owner
[LG V40 Guides, News, & Discussion] whitedavidp:
At least you have a working phone...

You MUST be on Pie to do this as I understand it. At least you must be to install TWRP which, I believe, is the near term goal here. And I am on 20e on my 405qa7.

So did you manage to install temporarily the V35 boot loader in engr mode with QFIL? From the sounds of things, you likely need to go back to the very start, follow the instructions slowly and carefully, be sure you read and understand the 1st post. You can search this thread and the TWRP and decryption threads for my user id and see my posts. I am pretty sure you will find some details there. I had a bunch of help from others here. But with the V35 boot loader installed, you should be able to proceed.

If there is some kind of limit, I have not heard, read, or experienced it. I am no expect though...

So does the UA phone have an unlock in the developer options? My 405QA does. If yours lacks this, there is special handling required that is documented in the very first post, item 4 "For devices without the "Enable OEM Unlock" option, you'll need to flash frp! You can do so with (While still in V35 Bootloader)".
[LG V40 Guides, News, & Discussion] AndK79:
Write a new instruction step by step with corrections.

a lot of incomprehensible .android 8 9 qfil driver laf...
[LG V40 Guides, News, & Discussion] serpent android:
hi All, can anyone please guide me as to what variant is best for the v40.. i mean amongst att,vertizon, t mobile and korean. thanks
[LG V40 Guides, News, & Discussion] whitedavidp:
I guess that depends on what you want/need, where you will be when using the phone, etc.
[LG V40 Guides, News, & Discussion] Bmichael74:
hello peeps. So here is my dilemma. Ive rooted and flashed many phones, used fastboot. download mode, lg flashtool and all that good stuff, but i cant lie, all the slot A and slot B mumbo jumbo, as well as all the different posts and if i can or cant install twrp, and if so, which partition....has confused me. .And yes Ive read through almost all the different strategies for achieving root and twrp but I dont want to mess up and brick my V40, and I would be very thankful if someone can tell me which step I should take next to acquire root and twrp too. Im bootloader unlocked and ready to go, i think.

I have ATT Lm-v405ua on ANDROID 10 guys. I used this thread to unlock my bootloader with 9008 mode, and have fastboot ready to go, if we can do everything with that, than im very happy. If not, do i have to flash the European pie firmware (EBW), then Magisk to get root or since im bootloader unlocked, can i just install twrp, then root with magisk? Again, I'm on ANDROID 10, bootloader unlocked, fastboot functional (no download mode i think) no root, no twrp, phone is working just fine, Any help would be splendid and If you need me to put 5 bucks on your books or something that's not an issue. But is being on Android 10 going to be a problem? With twrp? With root? Where do i start you lg superheroes?

I miss the HTC Evo! Flashing was fun back then!
[LG V40 Guides, News, & Discussion] whitedavidp:
I am not at all sure about Android 10. This thread makes it clear that the bootloader installed after unlocking is for Pie and the Oreo bootloader used to unlock is not for Pie. So there could be issues, but it sounds like you managed the unlock and still have a working device. This is good as it implies that the Pie bootloader and the Android 10 bootloader are the same or at least compatible. The TWRP thread states the following requirement "Pie firmware on the active slot". So it really is not clear how/if this TWRP will work with Android 10.
[LG V40 Guides, News, & Discussion] Bmichael74:
What about crossflashing to European version which is trout friendly. The 9008 thread stated you anything was flashable after unlock? And their is a pie conversion mod too, does anyone have a thought?
[LG V40 Guides, News, & Discussion] Bigdogbizkit:
about to give up

Model # LM-V405UA

S/n xxxxxxxxxxxxxx

CURRENTLY

Android V 8.1.0

Kernel V 4.9.65

Build OPM1171019.026

Software V-V405UAIOD

I purchased used off ebay , its an ex- att phone , current carrier is cricket mobile .

Phone has developer options and allow OEM unlock selected. First thing I did was backup my phone using the LG-Bridge tool .

I have ADB install on my windows 10 Thinkpad , I right click = shift to access windows powershell in the folder that has TWRP-judypn-boot.img , I have had NO luck accessing the bootloader , phone just powers up normally …

PS C:\Users\casey\Desktop\V40 mods> adb devices

List of devices attached

LMV405UAa2a86096 device

I give the 9008 method an attempt and my phone list as follows in the device manager :

LGE AndroidNet USB Serial Port

power down / volume down / screen flash then volume up result in this screen :

[IMG="Firmware update"]https://photos.app.goo.gl/WXzWsAWRo6Fhbdmm9[/IMG]

Firmware Update do not unplug the sub connection until process is complete

633A B71

Official / E / L / RO

I have spent many hours researching my next option to unlock and root my V40.

I am looking for suggestion to unlock bootloader

phone does reboot and function normally
[LG V40 Guides, News, & Discussion] Bmichael74:
Let me assist if I can and I apologize if you already tried this but for 9008 mode, once you are in EDL MODE (your device will appear to be off with a blank screen), you need to update the windows driver for I believe the modem connection or the serial port in device manager. Simply use the windows update in the driver menu in device manager and when the driver has finished installing, and if you are in fact in EDL MODE, device manager will switch and say 9008 MODE onstead of serial or whatever the connection was.

---------- Post added at 11:03 PM ---------- Previous post was at 10:51 PM ----------

Let me add something more. What's happening is your phone is going to download MODE when you attempt 9008. Once you nail EDL and 9008, make sure to follow the process to the t when you reboot to bootloader in the instructions. I could never access fastboot/bootloader menu on the lm-v405ua until that moment. (Keep in mind you will not have download MODE like you are seeing now, only fastboot until you re-flash the laf partitions according to what the instructions state)

Hope that works for you.
[LG V40 Guides, News, & Discussion] trouble.:
Guys! Need help! I flashed v35 engineering bootloader with qfil on my lmv4405ebw and now i can't access fastboot!
[LG V40 Guides, News, & Discussion] Baijoosharma:
need urgent help i successfully unlocked and rooted uLM11g then cross flashed ULM 20e fast-boot lost so i used Qfil and applied same procedure on it stuck on fast boot window so i flashed Twrp-Magisk_20e_9.0-Pie_boot_a_only for few second it was showing in top corner press something to delete ..... now screen is only black

nut one hope is when i connect to Qfil it showing in port but after partion manager getting sahara fail error [;ease help :'(
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
Dont you alredy have fastboot access on the ebw as well as can officially unlock through LG?

---------- Post added at 02:20 AM ---------- Previous post was at 02:17 AM ----------

Go into download mode and confirm that your pc can see your phone and flash a compatible KDZ and start over
[LG V40 Guides, News, & Discussion] Baijoosharma:
now am here no fast boot no download mode no logo only this :(
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
Sahara mode
[LG V40 Guides, News, & Discussion] Baijoosharma:
now this is also gone no more EDL :crying::crying:

---------- Post added at 05:00 PM ---------- Previous post was at 04:57 PM ----------

so my mobile is not even showing in Qfil EDL mode also not showing any thing mean my mobile is DEAD??
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
Your gonna have to keep trying to enter EDL/9008 mode and flash both laf_a and b and abl_a and b and go from there
[LG V40 Guides, News, & Discussion] dreadfulzz:
Stuck at flashing

So I've gotten to the point of flashing the ablpiestock.img file with fastboot flash abl_a however, whenever I enter the command it just puts my phone onto another screen of either the V40 normal boot logo or just a blank charging symbol. I can press a button to restart and go to the fastboot menu again but no matter what I do it just keeps going to that screen. I hear it disconnect from my PC and everything. Any reasons why this would be?
[LG V40 Guides, News, & Discussion] xanxor:
If you were not running pie when you reflashed the pie image you messed up. If that is the case however you just need to put your phone back into edl and then replace abl_a with the v350 image again.

Source: just did this to myself earlier today.
[LG V40 Guides, News, & Discussion] Baijoosharma:
EDL mode is working but unable to flash anything showing errors in last line GET gpt by mistake i erased data in partition manager but not GPT
[LG V40 Guides, News, & Discussion] Bmichael74:
Ainz_Ooal_Gown, could you assist me on what to do next? I'm on Android 19, unlocked bootloader, thinking I could cross to ebw the root from there. No download mode, only fastboot. Other than that phone is operating nominally. If I have to have download mode to move forward, then how do I flash laf back, I think that was a requirement. Shoot can't I just fastboot flash a rooted rom or something?
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
Well none of the ROMs come with root...and Android 19???? Do you mean 9 or 10? And what base model do you have right now?
[LG V40 Guides, News, & Discussion] walisbourne:
abla_a laf_a

i was wondering since i messed up incredibly horribly and i have no partitions what so ever to flash to if i can somehow flash new partitions? i downloaded a kdz of the version i was running and managed to extract the dz file and then extracted the bin and img files from that so far
[LG V40 Guides, News, & Discussion] Supreme Dimeji:
Hello, if I follow this process, will I lose data like installed apps?
[LG V40 Guides, News, & Discussion] Bmichael74:
Yes. Do a backup.
[LG V40 Guides, News, & Discussion] Supreme Dimeji:
Help, I'm getting this on my pc when I select "Update driver > search automatically".

and my phone is still showing "Firmware update" screen.
[LG V40 Guides, News, & Discussion] walisbourne:
i have messed up my phone

i was wondering how to fix the phone in edl mode, i have managed to erase the entire flash

lmv405qa, it was running android pie and is now stuck in edl mode
[LG V40 Guides, News, & Discussion] Bmichael74:
your trying to update drivers before your phone is properly put in edl mode. its kind of tricky, youll have a blank screen, not the download mode screen. Then you update the drivers

---------- Post added at 04:39 AM ---------- Previous post was at 04:33 AM ----------

ok, so i have download mode back, I actually just flashed the pie laf partitions back with qfil and it worked with my android 10 with unlocked bootloader. However, Im now stuck because Im getting an antirollback error when trying to crossflash to the European model. Im assuming this is because im trying to flash 10 to 9. Does anyone see a solution? Is QFIL able to do this if I flash the partitions individually? And if so, how do i do that with a KDZ. Id really like to get root, but ive read about a lot of hard bricks with the ARB thing. Anyone?
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
....wait for Us Unlocked android 10 kdz or for the ebw android 10 kdz to drop...
[LG V40 Guides, News, & Discussion] Bmichael74:
That totally bites. J cannot believe I have an unlocked bootloader and no root options. That is disturbing.
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
What base model do you have? If your on AT&T you should be able to simply backup your boot_a/b.img with qfil and patch it with Magisk and simply replace your unpatched one with qfil...
[LG V40 Guides, News, & Discussion] Redacted Kaos:
When I did this on my lg v40.. It just hangs halfway through the LG logo when booting mmi replaced the original boota and bootb and worked fine.. It only hangs when I try to push the patchesld mgisk imgs
[LG V40 Guides, News, & Discussion] Bmichael74:
Yeah I'm on ATT. What exactly do you mean by base model? Lm-v405ua30b or are you asking for different build info? I will take a look tomorrow and see if I can pull off your recommendation. Soneone else recommended that too I think.
[LG V40 Guides, News, & Discussion] piemanny:
Could someone please help? So I manage to do all the steps until it gets to putting the phone in fastboot. Currently my phone shows the LG v40 logo, however I'm not sure if the phone is in fastboot mode. I think I may have uploaded the image into the wrong partition, there were some errors, could someone help me understand what I've done through the logs?

Secondly in order to send these fastboot commands, do I need to have downloaded ADB? And do I need to CD into the folder where fastboot.exe in order to execute? Could someone do a step by step instruction on how to send the fastboot command lines please
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
Mine hanged when I tried 20a pie patched boot.img on 20e pie...so I had to pull the 20e boot and patch it...
[LG V40 Guides, News, & Discussion] piemanny:
here are the logs
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
Yes and yes...and you'll know when your in fastboot when you get a screen with a bit of info and on the top in big green letters it'll say "restart" or "start" just the V35 fastboot and stock V40 pie fastboot differ in more ways than just the spelling of words...
[LG V40 Guides, News, & Discussion] Supreme Dimeji:
How do I put my phone in edl mode without the firmware update screen coming up?

It always show EDL Mode for like a second, then immediately brings the Firmware Update screen.
[LG V40 Guides, News, & Discussion] piemanny:
You need to hold the power button + vol up + vol down, then when the phone turns off, press the vol up button rapidly as you are holding the power button and the vol down button

---------- Post added at 03:28 PM ---------- Previous post was at 03:27 PM ----------

Right now my phone will only boot in the LG V40 ThinQ power by Android logo screen, it won't boot into the OS or anything, do you know what I can do to fix this?
[LG V40 Guides, News, & Discussion] Bmichael74:
When my phone is in fastboot mode, you are presented with some options to be in the bootloader menu, or wipe, and I think to restart. I don't know if I have it anymore because I flashed laf back to regain download mode. But it is not just the V40 logo. Are you saying it's just stuck on the V40 screen? As far as ADB goes you can install it system wide and use it from any cmd window but here is my recommendation..... There are many tutorials already posted on ADB and fastboot. You can even run the "minimal fastboot and ADB" program executable, there are a few listed on XDA, it will provide you with ADB and fastboot access from a program you just run from anywhere on your machine, it's essentially another command prompt window but for fastboot and ADB, and provides the Google USB drivers and system wide installation. Once installed, type ADB devices to see if your device is being detected. Fastboot commands will not take if your device is not in fastboot mode. Honestly you should just run a quick search for ADB and fastboot on XDA and uoull see many well established tutorials. But again, I don't think your in fastboot mode. One thing I did because I messed up the first time trying to get into fastboot mode, use the windows system connect/disconnect sound as stated in the tutorial, as your indicator of when to press the button(s) to enter fastboot mode. I know that sounds like a given but that simple act of proper timing correctly will get you in without all the retries.
[LG V40 Guides, News, & Discussion] Mr.Sexo:
why does it fail

why does it fail
[LG V40 Guides, News, & Discussion] strk3r:
Hi guys. Need some help

I am stucking in error while every fastboot command entering except fastboot getvar all.

FAILED (Write to device failed (Too many links))

fastboot: error: Command failed

Device: crossflashed sprint v405ua to unlocked 20c

laf_a and laf_b - nuked, have access to fastboot.

abl_a, abl_b - flashed to v35eng.img, then back to pie boot.

Fastboot says that it unlocked, but cant do anything.
[LG V40 Guides, News, & Discussion] Bmichael74:
Yeah I'm sorry, I probably could not decipher the log for you although I noticed something in there towards the top that mentioned partition 4, not sure if that's referring to your destination for the bootloader or not. 8f it is maybe that will tell you. I'm sorry I couldn't be of more assistance. Good luck,
[LG V40 Guides, News, & Discussion] piemanny:
I'm going to try to use the LGUP tool to crossflash a .krz onto the phone so that it at least boots, although even that is soooooooo difficult. If heaven permits, and I manage to get this phone to boot, I'm going to stop tinkering with it, its too difficult for an amateur like myself. There are too many ways it can go wrong and when it does, I don't have the expertise to solve them. I think this is why LG phones lose so much value, they're just so awful when they come to being developer friendly.
[LG V40 Guides, News, & Discussion] Bmichael74:
Don't sell yourself short. You'll get it figured out. If you can still use lgup and qfil than I'm certain it's salvageable. And don't give up on tinkering, it's what keeps the blood in your brain flowing. Youre simply trying to access 100% of what you paid for and don't let the phone Nazis take that from you. But with that being said, I share your frustrations with the restrictions and all. It's like selling you a 4 wheel drive truck but locking you out of the controls to activate all 4 wheels, but they had no freaking problem charging you for the whole package. Take a breath and rage against the machine when your ready. I'm a step away from root but in no rush to make repairs. Lol.
[LG V40 Guides, News, & Discussion] piemanny:
Thanks for the kinds words. So I've been speaking to some other experts and they say that the ATT model can only be refurbished with the ATT kdz because the software is locked to the cpu, does anyone know if that is true? I'm not from the states, I bought the phone in China, so I don't know if that's the case. PS i bought the phone because this phone is so cheap on the second hand market here in China, and after trying to tinker with it, I finally understand why lol

My phone now says Your device has failed a routine safety check and will not boot, i'm not sure if it is repairable now
[LG V40 Guides, News, & Discussion] Bmichael74:
I would not be an expert, lol. I believe the reason you are seeing the safety check method is because your bootloader is unlocked. I think that's normal. The post mentioned making sure debugging on and unlock bootloader switched on to avoid that flag coming up but it still does, unless they were referring to a different message. But that definitely comes up when your bootloader is unlocked. As far as flashing it over, everything I read indicated crossflashing with any carriers should be give, except tmoblile. I'm on Android 10, and I was still able to unlock the bootloader but unable to crossflaash because it would be a system downgrade for me to flash to the EU MODEL,which is pie, and there are no Android 10 kdz from what I can see. But I guess I can still root theoretically with a simple process, patch with majisk..... I just haven't tried yet. What issue are you running into right now? Can you access LG up? Or get into qfil?
[LG V40 Guides, News, & Discussion] Redacted Kaos:
Has anyone else had any issues with QFIL now wanting to work correctley after unlocking bootloader? i disabled a couple LG monitoring tools while trying to install TWRP but never was able.. so i was gonna try to flash Magisk to the boot_a / boot_b but now QFIL wont pull up partitions or anything... its picking up the port 4
[LG V40 Guides, News, & Discussion] abuchison:
That is a false statement about ATT model . I have converted V40 ATT to regular North America V40 (V40 NAO firmware). The only model you can't flash over is the T-Mobile model due to different encryption key.
[LG V40 Guides, News, & Discussion] piemanny:
I'm going to attempt to do this again, do you have telegram? if so, I would love to pick your brain on how u did it successfully, I've just managed to unbrick my phone with the help of vlad, and i'm very keen not to brick the phone again
[LG V40 Guides, News, & Discussion] Bmichael74:
I think I'd like to give that a shot today. I've only used qfil 2 times and everything worked out but I've only used majisk once, meaning I'm pretty green with these LG tools, and partitions and slots, I miss stumproot, but hey where's the fun in that right, lol. Anyways is there anymore details you could provide regarding the process. I'm going to try regardless, just a little confused about what you mean unlatched one. Or does that mean umpatched one? So after patching the boot image with majisk I just flash it back to that slot I just backed up in qfil? And can I do something like this for root? I was going to wait but I just realized my Android Auto options will open up significantly if I root
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
lol typo I meant unpatched...well once you replace and have magisk manager on that slot you' should be rooted...