yashsingh1/xdaforums huggingface dataset:
[LG V40 Guides, News, & Discussion] Crystawth:
I tried so many different files and combinations and could NOT get it to let me flash my Verizon V405UA from the Android Q V405UA30d firmware to the V405QA720e Android Pie firmware. That is until I tried the files you had put together. I finally got it to flash and now have the OP_US firmware, stock LG apps, and I can actually use T-mobile bands. On the VZW firmware, it would not connect data at anything other than 2G Edge.
[LG V40 Guides, News, & Discussion] pigpigxx:
Hi all,

My Lgg8 has bootloop now. It loop betwen LGG8 logo ->Erasing Circle -> LGU+logo (sometime logo stuck in the middle). see below video (pls fast fwd..it's a bit long.:)):-

Mine is a Korea G820N with LGT. No bootloader unlock, No root. All stock. This happen after I replace the faulty camera module. (even I have removed that module and still the same)

I have install all the tools, LGUP, LGUP cmd, DLL, LG driver, Qil. I can go in download mode, factory reset screen, fastboot menu. all are normal.

I can flash new kdz and I have download a few different kdz to flash, (hv tried LGUP no matter refurbish or update option) have tried LGUP cmd. have tried LG bridge. All 100% work and no issue during the flash. BUT, the phone still the same bootloop as the above video.

Do you think here is a hardware issue in the mainboard rather than software ?

I don't need it unlock or root, I just want to back to function in stock ROM.

Looking forward for your comment.

cheeers,

pigpig
[LG V40 Guides, News, & Discussion] Baljeet Khairwal:
Is this possible to convert korean lg velvet in European Version.
[LG V40 Guides, News, & Discussion] hachiroku:
for my V35

sadly, i've tried every version of patched and unpatched 1.14, uppercut, and 1.16 in all versions. the best ones get me this far. it looks like the Korean ROM i flashed over the AT&T ROM for Android 10 does not allow flashing to another. I even attempted Korean Open ROM versus the carrier specific...not able to. Same error.

i am only able to upgrade to LG U+ ROM's. i just tried downgrading to LG U+ to Android 8 and this worked. I attempted to then flash a US Carrier ROM and it did not work, but it did allow me to flash LG Korean Open ROM Android 10 which it did not allow for previously with the Android 10 LG U+ ROM. Will hopefully get back onto an American ROM after seeing what ROM's allow for what.

haven't found a combo that allows for flashing out of an Korean ROM once you've already gone that way. did discover QFIL, but unsure how to use it properly to flash BIN files from a member who read out his latest AT&T V35 Android 10 security patch E version.
[LG V40 Guides, News, & Discussion] _tyler_:
I forgot to backup my abla/b before unlocking bootloader and I can't get into download mode even though I never touched my lafa/b. Any advice?
[LG V40 Guides, News, & Discussion] neocyke:
Different definitely. V30 is A only device. Flashing overwrites almost everything. V40 is A/B which prolly means the model name is stored differently. Serial number based hash mebbe?

Either way not that big of a deal methinks. Not unless you're trying to use it on a network that doesn't support outside models or trying to sell it off as a different model to someone..
[LG V40 Guides, News, & Discussion] phoneissue:
could anyone confirm after cross flashing the usa unlocked pie on sprint version, does it support tmobile band 71?

i have been searching everywhere without answer.
[LG V40 Guides, News, & Discussion] Alibaba0101:
Hypothetically, yes. Best bet would be to get a tmobile prepaid sim and use cell info lite to see for yourself. I'm in the same situation with the at&t bands. I haven't switched to the v40 from my v30 yet. If in doubt, get the v405qa model and bootloader unlock and root that one.
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
In theory it should support the bands but you must carrier/sim unlock with Sprint first before attempting this
[LG V40 Guides, News, & Discussion] elcocolo50:
Hi.. I have a sprint factory unlocked that has been damage after hard recovery because lost the sprint logo and the APN settings I use this recommendations and croosflashed sprint with verizon android pie and on first reboot the wirelees doesn't work and make a hard reset and now work very good..thanks to the O.P.
[LG V40 Guides, News, & Discussion] lowridincrew,:
Damn so no more Sim unlock with crossflashing huh
[LG V40 Guides, News, & Discussion] DeyEatDaPooPoo:
Following This Procedure for Sprint/GSM Unlocked LM-V405UA

Good afternoon and thank you for all the hard work and time you put into figuring out these things for us that don't know or understand nearly as much of it. :) Myself I'm a computer hardware guy but don't know much about mobile software. To make sure I understand: can I follow this procedure to both update my completely stock Sprint/GSM SIM-unlocked LG V40 LM-V405UA that's stuck on Android 8.1 Oreo to Android 9 Pie and to change from the stock Sprint firmware that restricts its LTE band support to the US Factory Unlocked firmware that allows for using Band 12 and 71 on T-Mobile and T-Mobile MVNOs? If so, is it recommended to flash the Android update first or the phone firmware? I don't care about losing any data since that's all on my Huawei Mate 9 and I can just transfer it later. If it's not possible is there a good link/resource where I could find how to do it? Thank you all so much in advance.
[LG V40 Guides, News, & Discussion] neocyke:
For me this is a very hands-off topic since I'm 12hrs ahead of you folks. I have no clear idea which model works on which carrier.. so can't really say..

That said, it makes no sense for you to ota update first. KDZ flashing overwrites whatever you have and it's generally suggested that you remain on oreo prior to any sort of flashing.

Check the LGUP for all thread to get yer kdz groove on.
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
So if your phone is Sim unlocked then flashing US Unlocked PIE should give you access to those bands but don't expect this to Sim unlock your locked device.
[LG V40 Guides, News, & Discussion] DeyEatDaPooPoo:
Reading your posts it seems I'm in the same boat as you are since you have a Sprint/GSM unlocked variant that you flashed to US Unlocked that you're using on AT&T. In my case I'll be using it AT&T as well (Cricket specifically), and later on probably Metro when I move so the most important newer bands I'd want to have access to that you don't on the Sprint firmware are 12, 30, and 71. From what I understand, unless you want the ability to put a custom or modified OS on the phone (which I don't), it's completely unnecessary to unlock the bootloader and then root... meaning, that if I just want to cross flash from the stock Sprint/V405UA firmware to US Unlocked/V405QA firmware I don't need to do either of those things and this guide should work fine and give me access to those bands I can't currently use right? After doing that would software updates also change over to be handled by LG directly or would they still be handled by (incredibly slow and crappy) Sprint?

TYVM in advance. :)

Ah, I see. Honestly that's just one of the things that suck so bad regarding cell service in the US: you think you've bought a phone that is flexible and should work on each network it supports to its full potential, but they intentionally gimp/restrict them from using certain bands on the other networks as a way to deter you from going there, or if you go there the experience is subpar so you go back. Meanwhile, they still get away with calling it "unlocked" because it technically supports them. The whole reason I'm thinking of doing this is because of the absolute pile of dog crap the Sprint firmware is. Not only do they horribly gimp the device by artificially locking out very useful AT&T and T-Mobile bands but they drag their ass the most out of any carrier when it comes to pushing out software updates... can't believe I'm still stuck on 8.1 thanks to them. Gonna make sure to cross flash to the US Unlocked firmware first. Thank you for all your help. :)

Thankfully mine is unlocked. I would never get a locked phone unless it was for free, regardless of how easy it would be to unlock it. Would be quite ironic and infuriating if cross flashing did the opposite of what you'd want and ended up locking the phone to a specific carrier lol.
[LG V40 Guides, News, & Discussion] neocyke:
That's one thing that I like about asian carriers. Yeah we get tech updates years later than everywhere else (there's no plan for 5G right now) but you can grab just about any other phone, slot in a sim and it'll work - provided it's not running US fw apparently. About updates, on previous LG phones I've used that weren't bl unlocked and rooted, OTA updates worked. That changed from the G6 & V30 looks like as there's no longer OTA but there's possibly an option available using LG Bridge. Of course there's now plain old kdz flashing since we have LGUP running.
[LG V40 Guides, News, & Discussion] leepc:
I also have an unlocked ATT V405UA with Android Pie V405UA20e firmware.

I can use it on T-Mobile network but LTE reception is not as strong as my unlocked iPhone X.

Also, this unlocked ATT version misses most phone calls when inside my house.

So if I flash from ATT Android Pie to V405QA7 firmware, will it get better LTE reception?

Will V405QA7 firmware enable the Volte or Wifi calling on T-Mobile?

LG V405QA7

https://www.fullstockfirmwaredownload.com/lg/
[LG V40 Guides, News, & Discussion] 53JH:
While I was flashing the laf.img,it showed 'Cannot flash this partition in unlocked state'.

I deleted BOTH laf ab before,so I couldnt get into the download mode.

Thank you for your help.
[LG V40 Guides, News, & Discussion] leepc:
I want to flash an unlocked LV405UA ( ( Pie: V405UA20a ) to V405QA7 ( Pie : V405QA720a_03_NAO_US_OP_0529.kdz )

I followed the 4 steps of this tutorial but got error : 0x6004, CrossDL USC_US>OPEN_US

Then I replaced DLL with DLL V40 1.9.39.7 ( https://www.mylgphones.com/lgup-dll-for-lg-v40-thinq-version1-9-39-7.html )

And also replaced LGUP_UI_Config_m250n with	UI_Config_V40_LGUP_1_16.

But still gave me the same error.

can you share your steps to flash from V405UA to V405QA7 successfully ?

Thanks !
[LG V40 Guides, News, & Discussion] Alibaba0101:
In case anyone else is looking to do this. I cross flashed the v405qa to my unlocked sprint v405ua and the at&t bands/radio are working. I switched to the phone today and at some point it used both band 66 and band 30 which the sprint lg v40 does not support natively. Look at my earlier post for which bands the v405qa firmware supports.

---------- Post added at 03:34 AM ---------- Previous post was at 03:33 AM ----------

From what i can tell teh v405qa7 supports more tmobile bands including B71. Worth a try.

---------- Post added at 03:36 AM ---------- Previous post was at 03:34 AM ----------

I paid Vlad to bootloader unlock my device and he used octoplus to flash the v405qa7 firmware to it. It was definitely worth it. Assuming your boatloader is unlocked already, you may be able to use fastboot to flash the kdz. Or if you followed the OP, looks like you can replace your laf partition with his modified one and then use LGUP to cross flash your kdz bypassing the version check.
[LG V40 Guides, News, & Discussion] leepc:
I just flashed my unlocked V405UA Pie to V405QA7 Pie by using 1.15 LGUP_CMD.exe

For who are interested crossflashing unlocked V40, check out this great tutorial below. very detailed and easy steps.

https://www.mylgphones.com/how-to-flash-stock-pie-kdz-firmware-on-lg-v40-thinq-with-lgup.html?amp

Now my V405UA able to get Volte and WIFI calling on T-mobile network.

I hope band 66 and 71 already been turned on but I am not sure how to verify it without root.
[LG V40 Guides, News, & Discussion] T3R4BYTE:
Good stuff coming for this device..;)
[LG V40 Guides, News, & Discussion] Alibaba0101:
I know band 66 is enabled by switching to the v405qa firmeware for sure. Use cell info lite while you are driving. it will show every band your phone is using every time it switches cell sites or bands. Or you can go into the service menu and lock that band in and see if you still get signal in an area that has band 71 (but i wouldn't advise it using the service menu route).

---------- Post added at 06:41 PM ---------- Previous post was at 06:38 PM ----------

Does this method leave the bootloader locked?
[LG V40 Guides, News, & Discussion] phoneissue:
please use this map to confirm if you have band 71 coverage :

https://maps.t-mobile.com/pcc.html?map=mvno-roamd-34l

just drop pin on your area and it will show all the available tmobile frequency,

if you do have b71 coverage, you can dial 277634#*# and go to "band selection" to lock your phone

to b71, and then go to "engineering mode" to check if it is connected to band 71.

wair for your update.
[LG V40 Guides, News, & Discussion] phoneissue:
"From what i can tell teh v405qa7 supports more tmobile bands including B71. Worth a try.“：

v405qa7 is usa unlocked version which supports b71 as listed on both lg and tmobile.

what puzzles me is att and sprint version, both have the same model number: v405ua

sprint version lists b71 support on lg website (tmobile does not list it which makes sense because it is intended for sprint), but att version does not, so after cross flashing v405qa7 on att version, i am not sure if it will enable b71 support, because so far no one can confirm if their sprint version supports b71 or not after flashing v405qa7.
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
That guide is by Xsavi it says superseded in the title
[LG V40 Guides, News, & Discussion] leepc:
After flashing to v405QA7 , my unlocked AT&T V405UA can make volte and wifi calling on T-Mobile.

No more missing calls indoors !

I can confirm band 2,4,12,66 are working fine on T-Mobile network. I can't verify band 71 because there is almost no 71 coverage in California.

---------- Post added at 10:50 AM ---------- Previous post was at 10:26 AM ----------

https://www.mylgphones.com/how-to-flash-stock-pie-kdz-firmware-on-lg-v40-thinq-with-lgup.html?amp

That guide above works. I followed the instructions and successfully crossflashed my unlocked V405UA Pie to V405QA7.
[LG V40 Guides, News, & Discussion] Alibaba0101:
Awesome! Is your bootloader unlocked? Did you root it?

Where are the volte or wifi settings? I don't see them on my at&t sim card. I think i have to call them to enable it.
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
Well of course CMD LGUP 1.15 or 1.14 doesn't give a flying ****, but that's also dangerous if your not careful you can end up with an expensive paperweight
[LG V40 Guides, News, & Discussion] leepc:
My unlocked V405UA is still unrooted based on Root Checker App.

So I guess it's still boot loader locked.

Before flashing to V405QA firmware, my V405UA always switched to 3G from LTE when making phone calls in T-mobile network.

Now it shows HD" phone calls without stoping LTE. And I can make HD calls through only Wifi too.

check if you turn on "wifi calling" under network/call in setup.

Thanks for the warning about CMD LGUP. I guess I was just lucky. Please educate me more.

I did try your method but unfortunately LGUP 1.16 shows error when cross flashing my LV405UA Pie to LV405QA7 Pie.

That's why I followed the other tutorial to use CMD LGUP 1.15 to make it work.

Why CMD LGUP is dangerous? If it fails, can't I just use regular LGUP 1.16 to flash back my original KDZ ?
[LG V40 Guides, News, & Discussion] phoneissue:
After flashing V405QA7 to your unlocked AT&T V405UA, can you test it on att sim ( i know you are using tmobile currently) with the following:

1. can you dial 277634#*# or *#546368#*350# to access the service mode and then do band selection?

2. does it support both att volte and wifi calling? I would expect yes because the IMEI is att's, on the other

hand, from [MENTION=957521]Alibaba0101[/MENTION]'s reply: https://xdaforums.com/showpost.php?p=80379609&postcount=43,

he does not get or see volte and wifi call setting on his att sim, I think that is because his IMEI is sprint's, not sure if att customer support is willing to add that IMEI to their database to whitelist it for att volte and wifi calling.

so I believe the best shot is to buy AT&T V405UA instead of Sprint V405UA.

wait for your update, thanks.
[LG V40 Guides, News, & Discussion] jspencerg:
Thanks for the guide

Works perfectly Thanks
[LG V40 Guides, News, & Discussion] leepc:
When using ATT sim, V405QA7 Pie doesn't have option to turn on wifi calling and volte. Also can't access service mode by dialing 277634#*#
[LG V40 Guides, News, & Discussion] phoneissue:
try *#546368#*350#, then field test---modem setting, use band selection to lock band and use engineering mode to check what band you are in. Correction： should use *#546368#*405# for v40, see #50 below

try *#*#4636#*#* and then phone information to check if "volte provisioned" and "wifi calling provisioned" are enabled.

The above code works on v35, hope also work on v40, wait for your update, thanks.
[LG V40 Guides, News, & Discussion] neocyke:
To access the svc menu, the last 3 numbers after 546368 is the phone model. 350 is for V35. V40s will use 405 or 409 if korean.
[LG V40 Guides, News, & Discussion] phoneissue:
Thank you for telling me this info！！！！
[LG V40 Guides, News, & Discussion] leepc:
With AT&T sim card, volte provisioned" and "wifi calling provisioned" are disabled. Can't be turned on.
[LG V40 Guides, News, & Discussion] Lediju:
Can I crossflash an ATT v40 to a Korean firmware?
[LG V40 Guides, News, & Discussion] phoneissue:
i have both v35 usa unlock variant and att variant (cross flashing to usa unlock rom), with cricket sim card, both support att volte (though no wifi calling), that is why I expect your v40 att variant with usa unlock rom should behave the same because the imei is already in att's database. In addition, both my v35 variant support Verizon volte too, wonder if you can visit a local Verizon store to test your v40 on their volte.
[LG V40 Guides, News, & Discussion] racsomar:
OK so I have a sprint model V405U android 8.1 SIM unlocked and I want go to the US Unlocked version V405QA7 Pie.

- using this main post guide is OK?

- OTA updates works?

Thank you
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
No OTA won't work you would have to always KDZ to the next release
[LG V40 Guides, News, & Discussion] racsomar:
Thank you. What I did was flash the Verizon version, and now I have OTA updates availables :)

---------- Post added at 04:34 AM ---------- Previous post was at 04:12 AM ----------

Thank you. What I did was to flash the Verizon firmware and now I have OTA updates availables. So cool
[LG V40 Guides, News, & Discussion] Lediju:
How did you unlock your LG v40 ATT?
[LG V40 Guides, News, & Discussion] schloop:
i'm getting mixed readings from this. do you need to be BL unlocked to do this? also can you root?
[LG V40 Guides, News, & Discussion] sammibulin:
So I have followed this guide so far but LG UP is not recognizing my device. It does not detect as if it is plugged in. Any help?
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
For my guide if you follow the no root part then no the second part is for people who are rooted.
[LG V40 Guides, News, & Discussion] T3R4BYTE:
Do you have lg mobile drivers?
[LG V40 Guides, News, & Discussion] kris597:
I am also having this issue. I installed lg mobile drivers and am getting the error " handset not connected " .
[LG V40 Guides, News, & Discussion] schloop:
thanks for the response.

so if i want to root i'll need to be BL unlocked? sorry
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
Yes
[LG V40 Guides, News, & Discussion] schloop:
awww. i'm sad now. really hard to find the EU LG phone for the states. thanks for the help!
[LG V40 Guides, News, & Discussion] jimmyStoo:
Huge thanks.
[LG V40 Guides, News, & Discussion] jimmyStoo:
So does OTA update still work in the US fw that's flashed to a sim-unlocked Sprint phone?
[LG V40 Guides, News, & Discussion] cavcagamgee:
I get this error, too. I'm unlocked, rooted, and currently running LineageOS and can't find a working way of getting it back to stock (wanted to test stock camera to see if my issues are hardware or software). Thanks for any help!
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
Your running V40 Fastboot/abl that's why it won't flash it, you must be on V35 Fastboot/abl....
[LG V40 Guides, News, & Discussion] cavcagamgee:
Oh. Would you be able to point me toward instructions on how to change that? I don't think I'm searching the right thing.
[LG V40 Guides, News, & Discussion] cavcagamgee:
Okay, so I think the problem is that I have TWRP running on the recovery, so when it boots into slot B, it's booting into TWRP. Is there somewhere I can download the V35 bootloader?
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
The instructions are on Telegram I'm gonna ask one of the guys to make a guide here on XDA
[LG V40 Guides, News, & Discussion] cavcagamgee:
Could you copy it over and site/source them, even if you can't link to Telegram? The only telegrams I could find had a about a dozen posts, all about gcam.

EDIT: I finally found the right chat! I'm reading through it now to see how to get the v35 bootloader.

EDIT #2: So just for anyone who is in my boat, I'm gonna compile a brief step by step (courtesy of user [MENTION=629051]Luckys[/MENTION]8 on Telegram) to get the LG V35 bootloader for OP's tutorial. My situation was with TWRP and with my OS booting from partition b instead of a.

1. Download the attached files. Save them onto your sd card for easy use.

1.5. So I can't find a direct file for the laf.img file, and it's too big to upload here. I am unsure if it is different from the one uploaded by OP. If you go through this chat convo and search for laf.img you should find it, especially considering I gave you the name of the person helping. If you don't have partition weirdness, you can skip this part (and the related command line below).

2. Load into TWRP

3. In TWRP, select Advanced and then Terminal.

4. Type the following (slightly adjusted to your specific device if needed)

dd if=/external_sd/laf.img of=/dev/block/bootdevice/by-name/laf_a

dd if=/external_sd/abl_35.img of=/dev/block/bootdevice/by-name/abl_b

5. Go to the Reboot Menu. Make sure slot B is selected. Then reboot into EDL.

Continue OP's tutorial.
[LG V40 Guides, News, & Discussion] cavcagamgee:
Can I use any other version of LGUP? I ask because it just doesn't load. I have gone directly to the .exe and checked on task manager. It doesn't actually come up. What should I do?

EDIT: Okay, after using Revo Uninstaller on all the LG stuff on my computer, I was able to follow this tutorial.
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
Ahh the cmd line variant....
[LG V40 Guides, News, & Discussion] Ainz_Ooal_Gown:
Also I'm pretty sure I shared the correct laf.img file...
[LG V40 Guides, News, & Discussion] cavcagamgee:
I didn't think it was wrong so much as I don't know how to tell the difference, so I used both.
[LG V40 Guides, News, & Discussion] strifej:
I was getting a lot of help in the v40 telegram group, but ran into some issues they haven't seen. I was trying different firmwares in hopes of finding a modem that works with my telecom. I had no problem flashing between all the 405 models with LGUP 1.16 Partition_DL mode. But after doing that with a Korean ROM, it seems to have messed up the boot stuff. My V35 fastboot is gone and it's now a useless bootloader that can't write anything. I can't use 1.16 to flash back to Verizon or something else because it's running stock laf and prevents me from cross flashing.

It seems 1.15 command line will ignore that and will allow you to flash, but was wondering if after flashing back, how I can get root again? Mine is bootloader unlocked.

Thanks
[LG V40 Guides, News, & Discussion] Inerent:
You can try also lg bridge recovery error. It flashes everything to original and even the Bootloader...