yashsingh1/xdaforums huggingface dataset:
[LG V20 Guides, News, & Discussion] cnjax:
Los based roms change the partition sizes so you will probably need to do a full wipe and format and then flash the kdz
[LG V20 Guides, News, & Discussion] kingtm:
Use this method to back to stock - https://xdaforums.com/v20/how-to/guide-lg-v20-to-life-t3827732
[LG V20 Guides, News, & Discussion] tech_infinity:
how do I perform a full wipe without twrp or the phone booting up?

EDIT: It booted. Thanks
[LG V20 Guides, News, & Discussion] endleesss:
if the method doesn't work, try this:

1. take out the battery

2. push vol up

3. put in the battery (while holding vol up)

4. plug in usb (while holding vol up)

that worked on VS995
[LG V20 Guides, News, & Discussion] gila2:
Downgraded from Oreo back to Nougat 10c(SEA) for my H990DS. Steps are on point. Thanks OP!
[LG V20 Guides, News, & Discussion] wing_addict_usa:
Anyone know where to find firmware for h918?
[LG V20 Guides, News, & Discussion] shadavis08:
SuperRom thread [MENTION=1885277]hassaan[/MENTION]M has it just remember firmware for nougat and oreo are different.
[LG V20 Guides, News, & Discussion] shadow322:
https://lg-firmwares.com/downloads-file/15185/H91810u_00_0528.kdz
[LG V20 Guides, News, & Discussion] hec2k:
I need serious help

Tried to downgrade a LG V20 VS995 from 20c to 20b

And now it won’t boot at all

It just vibrates constantly every 2 seconds

Only shows me anything on screen if I plug it in without a battery

No other signs

Not sure if battery is dead

Someone told me to fix boot with jtag but I have no idea how to do that or where to start

If anyone can contact me and help please do so

Whatsapp 3479154327 or Skype datricanfromqueenz

Thanks

---------- Post added at 09:12 PM ---------- Previous post was at 09:12 PM ----------

I need serious help

Tried to downgrade a LG V20 VS995 from 20c to 20b

And now it won’t boot at all

It just vibrates constantly every 2 seconds

Only shows me anything on screen if I plug it in without a battery

No other signs

Not sure if battery is dead

Someone told me to fix boot with jtag but I have no idea how to do that or where to start

If anyone can contact me and help please do so

Whatsapp 3479154327 or Skype datricanfromqueenz

Thanks
[LG V20 Guides, News, & Discussion] jackson019:
Well first off, do you remember the battery level when you initiated the downgrade? If it was 50% or higher it's doubtful the battery went bad. Secondly, the next option is to try another battery. If that fails, try to boot to recovery. If that fails, you might have to use the patched LGUP and do a Partition DL flash via download mode. Follow this link and when you get that up and running, select "PARTITION DL", then when the sub menu opens, check "Select All" and make sure all options are checked. Your data will be wiped, but you should be able to boot.
[LG V20 Guides, News, & Discussion] jax0rz:
i've actually been trying to get this to work...

H990N, trying to go back to Nougat from Oreo (Dec 2018 security patch)

i've tried following the steps at the beginning (tried the 4.2 drivers and the 4.1.1 drivers) and also tried a firmware e and h versions, but each time i boot up LGUP as per instructions it says "can't load the model" etc.

I've extracted the dll from firmware e and h and tried both and it doesn't work; antivirus is off.

the best i've gotten is launching LGUP before the usb device connected sound on PC happens, LGUP says "device not connected" and when i press OK i can see that it shows my model and [COM4], however when i click select it goes back to the "can't load model" message.

Is this an issue with the current security update or am i doing something wrong? i got the firmwares from the links at the beginning and extracted the LGUPc files directly from both.
[LG V20 Guides, News, & Discussion] Vortell:
Not sure about arb status on H990ds I don't think they incremented it. I would check that first. I think there is dial code for that if on stock. Then for your issue with model not matching there is lg v20 patched lgup. Read how to use it correctly in it's thread. Or look one post above yours for quick info and link. If still having issues flashing correct model the only thing I have read about is flashing another model's kdz then flashing correct kdz after.
[LG V20 Guides, News, & Discussion] jax0rz:
holy crap i'm an idiot... i forgot the 'common' folder entirely for the last two days that i've tried it; it took me until downloading the patched version to realize that i needed to include the \common FOLDER.

anyways, i can confirm that the instructions at the beginning work for an H990N patched with the Dec 2018 security update! the only thing i would add to the instructions is that you can get the DLL file from the same kdz file using the WindowsLGFirmwareExtract tool from here https://xdaforums.com/showthread.php?t=2600575
[LG V20 Guides, News, & Discussion] wanderso:
Using the OP's technique and the appropriate .kdz image, can I reflash an LS997 and make it into a working US996? I'm interested in only non-rooted (stock) ROMs, and I've got the "upgraded" LGUP.
[LG V20 Guides, News, & Discussion] anon389389109:
delete
[LG V20 Guides, News, & Discussion] Dorasamu:
so were you able to downgrade to nougat?
[LG V20 Guides, News, & Discussion] jax0rz:
yep; still on the nougat i downgraded to as well
[LG V20 Guides, News, & Discussion] mgzavala:
Hello, do I need to re-lock the bootloader to be 100% stock? I want to install the Android 8 ota update, my phone is LG V20 H91810U with Android 7
[LG V20 Guides, News, & Discussion] Dorasamu:
Thanks, confirmed works.

Downgraded Oreo to Nougat on US996.

Just did a downgrade from Oreo to Nougat without relocking bootloader.

Still unlocked after flash.
[LG V20 Guides, News, & Discussion] mgzavala:
How did u do it, did u use a kdz file, cause I get an error: upgrade failed to install when I tried to do it ota. Also I was trying to go back to stock because for some reason I have no cell radio, so I have no phone & data signal, & I was hoping if I went full stock the I can maybe get it to work again
[LG V20 Guides, News, & Discussion] jax0rz:
honestly, the Oreo update took some of the functionality out of the phone (custom vibrate, auto battery saver at 15%, smart location is buggy, and some other ones i can't remember right now). i'm not sure if your lack of radio signals is software related.. if you are somewhat hands-on you could look into replacing the antennas (there is one at the top and one at the bottom of the phone; the phone is extremely easy to disassemble and a tutorial is easily available on youtube)
[LG V20 Guides, News, & Discussion] CheeseMaster!:
Need some experienced advice on what to do..

I'm having the FRP bypass problem. My stepson factory reset my phone and now I can't set up the new phone. I have all my receipts and verification but I've been overseas so google forgot my phone number when I try to find my account through their recovery process, so after going to Verizon (VS995) they got me in touch with google, and now google says I have to send the phone back to LG to have them flash it. If I can do it my self using a simple step by step process like the instructions posted here.

Will this work?

Thank you
[LG V20 Guides, News, & Discussion] Chyt:
Hi guys,

I need to downgrade my V20 H990DS from oreo to N (sec. upgrade before 2016 dec 31) to get rooted.

Got a kdz for the region from lgfirmwares.blabla.com, downloaded, lgup, dll and stuff installed (well, get the right dll wasn't easy), phone recognized.

But LGUP stucks at 4% (pretty immediately) saying: 0xD AtCmd TxRx Error

I found nowhere anything about this error message. Could you enlighten me please...?

Thanks in advance!
[LG V20 Guides, News, & Discussion] ishb3w:
Alright, so I tried to root my v20 but didn't know I was supposed to remove the google account before wiping, and now im stuck at the frp lock. I tried LGUP downgrading and upgrading and im back on 20c like it was before, but i still can't login. On my google account i removed the phone from my devices, but that didn't help. Should I just send my phone to LG? I bought an S10, so it wouldn't bother me to be without it.
[LG V20 Guides, News, & Discussion] it'sup:
Works's like a charm from Oreo Firmware 91820G back to Nougut 91810P and I might mention not to root or Grind your phones for root fisrt or it probably won't work and you'll be stuck in the same process constantly over and over
[LG V20 Guides, News, & Discussion] noddledizzy:
Will doing this to H918 prevent me from doing this https://xdaforums.com/v20/how-to/step-step-guide-lg-v20-h918-unlocking-t3808258

I'm worried that H918TN will prevent me from doing all that again.
[LG V20 Guides, News, & Discussion] pointbob:
I have lg v20 LS997ZVD sprint flavor. This is zv8 and as such cannot be unlocked by hiddenmenucall.apk

Can someone tell me if i can root it and get it back to zv7? much appreciated..thanks
[LG V20 Guides, News, & Discussion] cnjax:
You can't downgrade due to sprint incrementing arb, therefore no root
[LG V20 Guides, News, & Discussion] Vortell:
There is new root that may work...

https://xdaforums.com/v20/development/3-18-71-perf-root-shell-lg-v20-variants-t3990145
[LG V20 Guides, News, & Discussion] kbhuvi:
I have H990DS currently on 8.0 firmware. I want to downgrade to pre Dec 2016 so as to root the device. LG firmware site does not show any such version for India. Can anyone point to the firmware that would work for me

Regards
[LG V20 Guides, News, & Discussion] asoomal:
Nope, didn't work. Useless phone, not even worth rooting.
[LG V20 Guides, News, & Discussion] N4sha:
Hi guys .

i have lg v20 f800s model and i rooted my phone with f800l rom and then flash vs995 weta rom android 7 version.now that i want flash the official f800s android 9 rom with lgup I get an error invalid KDZ file vs995>>>>f800s please help me.tnx
[LG V20 Guides, News, & Discussion] Landloord:
Choose partition dl
[LG V20 Guides, News, & Discussion] Worschtebrot:
How do i know what kdz i have to download.

On the H990 DS Package is a ARE, so i guess its an Arab Emirates Version.

But what kdz do i have to download?
[LG V20 Guides, News, & Discussion] justcosmic:
I have the F800S too and can't boot into bootloader. I was wondering about flashing F800L KDZ as I saw that F800L owners seemed to be able to unlock bootloader.

So was thinking of doing this and then have seen successful LOS installs on another thread (unofficial LOS 18 working pretty well!)

Anyway - can you confirm if flashing 800L rom should work ?

Well I just tried - LGUP won't let me install full 800L ROM on my 800S so I tried just in Partition DL - but still won't boot to bootloader...

Would love to know how you managed to get 800L ROM installed on 800S and if that made fastboot available

I've since read that you have to first install F800L official, then use Dirty Santa to unlock bootloader and root - is that correct ?
[LG V20 Guides, News, & Discussion] DaVinniCode:
I'm dealing with a similar issue. I even installed the full H915 kdz on my H910 which made it functional again, but no fastboot mode now...

Initially i couldn't install the full kdz with LGUP due to the version mismatch, but used 'partition DL' and got it running again, after that it was branded H915, so then i could flash the full kdz using 'refurbish' in LGUP, but yeah, still no fastboot available.
[LG V20 Guides, News, & Discussion] justcosmic:
I eventually managed - but it was a long series of several process' and I have read that it is different for 910/915. I hacked together parts of various guides - the closest of which was for F800L. Finally managed to succeed with unlock bootloader and root - using highly adapted dirty santa method.

Check threads on dirty santa for your specific device is the best advice I could give. People are managing to do it so it's possible for sure.
[LG V20 Guides, News, & Discussion] Mandown:
Not sure if it has been said but to help anyone else in my situation. First thing is I decided to flash lineageOS 17.1 from alpha omega ROM, Clean install. Well that was my first mistake because LineageOS sucks at telling you about why you cant just do that and need to downgrade to nougat then to 15.1 or 16 cant remember then 17.1 otherwise the fingerprint sensor and camera/light will break on top of certain apps fail to work like youtube. Restored back to A-O and fingerprint works but the apps still break and camera breaks. Then I LGUP and downgrade back to 13a firmware, problem was settings on boot forever crashes so could not setup phone. After re-re-re flashing 13a KDZ with no fix, I for the heck of it flashed 20c and BOOM everything works again! Then I retried the 13a firmware and once again, WORKS!

Hopefully helps some people, seems a big issue moving to lineageOS and not knowing to downgrade to nougat and incrementally upgrading to the later versions.
[LG V20 Guides, News, & Discussion] Diagon:
I'm also on AO and poking around to figure out how to move to Lineage. Could you give me a pointer on how to do that downgrade? Can I just flash over A-O before going to Lineage 15.1 (or 16, as you say)? And if I can just flash over AO, which ROM should I use?
[LG V20 Guides, News, & Discussion] Datblkbro:
Yes there is http://lg-firmwares.com/lg-vs995-firmwares
[LG V20 Guides, News, & Discussion] roc342:
That is for the Verizon version , not sprint.
[LG V20 Guides, News, & Discussion] MANDROIDS:
We need the firmware for the LS997 (Sprint).
[LG V20 Guides, News, & Discussion] Ickyz:
VZW is failing at 9% on my Stock Phone

Just tried it for Sh*ts & Giggles

---------- Post added at 01:37 AM ---------- Previous post was at 01:34 AM ----------

997 Isnt out yet, should be soon GO read the Dirty Santa Thread it may help you Can you Access TWRP, assuming thats why your here
[LG V20 Guides, News, & Discussion] Xdemon_87x:
" LGUP cant load model "

its an tmoblie model ... any help?
[LG V20 Guides, News, & Discussion] robertwhitten87:
I just tested the VS995 using the uppercut method by codefire and it worked on my phone. non-rooted still stock VS995...

haven't rooted yet, but that will probably be next to see if I can go back.
[LG V20 Guides, News, & Discussion] Ickyz:
I just tried my 995 with UPPERCUT & it didn't restore my system , phone's still setup how I did it.....Did you do the Factory Reset?

I didn't feel that was necessary, afterall the reflash should have done that....it flashed Flawlessly & even said erasing right afterwards, then it just rebooted to my settings....1st phone went ape sh_t when i tried to root so im waiting it out with the 2nd one until I know, I can go right back to stock if needed
[LG V20 Guides, News, & Discussion] Splinter77:
Hi, I recently tried to use DirtySanta on my H915 thinking that I could use this method to get back to stock but the KDZ won't install because my phone is now seen as a US996. Is there any way to fix this at the moment? The G5 forums mentioned using chkdzdev for a similar issue but I couldn't get it to work

EDIT:Thanks to KedarWolf, I'm now back on stock https://xdaforums.com/showpost.php?p=70337463&postcount=5
[LG V20 Guides, News, & Discussion] dedemike0421:
it work in like 10mins for me, im on 10i without root but my tmobile v20 works
[LG V20 Guides, News, & Discussion] dedemike0421:
Yes i had success using this method, i thank you
[LG V20 Guides, News, & Discussion] 881jz:
so works perfectly. just managed to restore my phone(H990DS TW) after being out of action for a few weeks.

my issue was using the supplied USB cable in a USB 3.0 port. i switched to an older cable using the micro -> USB type c connector i got with galaxy note 7. this worked straight away for update. i then ran in to issue where phone would boot into system restore mode 2 on blue screen. i tried LG Bridge at this stage, it picked up the update required but refused to download it. flashed again with LGUP and away i went.

I broke my phone real by following https://xdaforums.com/v20/development/ls997vs995h910-dirtysanta-bootloader-t3519410 and then restoring aboot.img and boot.img with no system backup and rom from other model flashed.

it would boot download mode and fastboot but nothing else. manaaged to kill recovery.

but i am back up and running now.

a note for anyone searching. the KDZ files available for H990DS cant be used for refurbished from LGUP. the LG extract tools to CAB will get you that far but you will not be able to open .cab with rar or zip, they no longer seem to work.

use WindowsLGFirmwareExtract-1.2.5.0-Release-1 to extract the KDZ files, you can get .DZ and DLL and the DZ can be extracted further with this tool to get shystem\recover\etc.

cheers and happy new year
[LG V20 Guides, News, & Discussion] Spider Monkey:
DO you have found any solution ??????

DO you have found any solution for this problem ??????
[LG V20 Guides, News, & Discussion] bstollyy:
thank you guys SO MUCH!!! I have been trying for days to fix an Lg v20 vs995 that I corrupted..... I finally fixed my phone!!!!!!! Again, thanks for ALL of your help!
[LG V20 Guides, News, & Discussion] Singularity_iOS:
Im going to give this method a go later to try and flash the Aus 990DS firmware over the Twn (Taiwan) firmware because im getting terrible signal because of the location settings. Hopefully should go fine since its the exact same hardware they use in both locations.
[LG V20 Guides, News, & Discussion] Emilicious:
I JUST did this and it worked like a charm :good:
[LG V20 Guides, News, & Discussion] Singularity_iOS:
How do I fix the error of LGUP cant find the model in com folder? I cant find anything on google
[LG V20 Guides, News, & Discussion] 881jz:
search XDA for uppercut, you will likely get a virus warning when running it but it seems safe enough.

or make a folder called common in C:\Program Files (x86)\LG Electronics\LGUP\model.

you will need a model specific dll file in there. if it works i have attached mine otherwise you can extract the .KDZ with WindowsLGFirmwareExtract-1.2.5.0-Release-1 and it will provide a LGUPc.dll, rename to LGUP_Common.dll and place in C:\Program Files (x86)\LG Electronics\LGUP\model\common\
[LG V20 Guides, News, & Discussion] Singularity_iOS:
There is no attachment? Thanks for the info !
[LG V20 Guides, News, & Discussion] diehardbattery:
I'm trying to do this on my H918. I get up to 9% in the LG UP program and get an error that says "Error:Error Code 0x2000,CEFS::Initialize()" The DLL version is 0.0.3.23. Any ideas?

EDIT: Nevermind, I extracted the dll from the kdz and its fine. I most likely downloaded one for a different model.
[LG V20 Guides, News, & Discussion] sbm1976:
Can anyone tell which kdz file to install for Indian LG v20 H990DS model.

I have installed H990ds10c_00_OPEN_TW_DS_OP_1214.kdz ...Upgrade successful but after that its giving error about Buyer Code and VOLTE stopped working.

On the LG firmware download site there is no specific kdz for India.

Thanks
[LG V20 Guides, News, & Discussion] Darriousx:
So there is a DLL for the H918 now?? I remember when I first bricked my phone and tried to get this to work but just returned it to T-Mobile instead.
[LG V20 Guides, News, & Discussion] diehardbattery:
I don't know if it was there from the beginning but it was in the one I downloaded.
[LG V20 Guides, News, & Discussion] ecgranado:
[MENTION=3996092]diehardbattery[/MENTION] how did you get the dll and will you share? :)
[LG V20 Guides, News, & Discussion] jcall8588:
any luck on a sprint phone yet? I really need help getting my phone back working
[LG V20 Guides, News, & Discussion] Darriousx:
Would you mind explaining how or possibly sharing the DLL? :)
[LG V20 Guides, News, & Discussion] diehardbattery:
All I did was download the tool from this thread, extracted the dll from the KDZ, and put it in the "common" folder under the LG UP tool. If the dll isn't there I'll see if there's a way I can upload it.
[LG V20 Guides, News, & Discussion] ajent:
Edit:

I guess I had a bad download, downloaded again with a download manager and the phone flashed correctly. :p

it's very odd to me, they both had the same file size, and actually flashed up to 32%. Seems like a bad download wouldn't flash at all. oh well

VS995, LGUP giving error at 32% - "error: 0x2bc, invalid command response code = 0x80000202"

Have tried using after extracting dll from kdz file, and using uppercut.

The first attempt I still had the static screen, now the screen functions normally, so i'm assuming it flashed some files.

I ended up here by having a rooted vs995, then installing lineagOS, but having sim card issues, so I restored my rooted vs995 stock rom. Once booted, it wouldn't let me login with fingerprint, and said my pin was wrong, after 10x it said it's going to wipe the device, then I couldn't get past TWRP.

Now the phone only shows Firmware Update screen when turning on. Downloading the most up to date kdz now to see if it will flash that.

Edit: Newest KDZ fails at 29% with same error.

When fixing the G4, I had to use the refurbish option. This kdz doesn't allow that, is there a way to force it?
[LG V20 Guides, News, & Discussion] leyvatron:
Stuck at TWRP with no luck of restoring. I flashed the vs995 boot image and system image and it goes back to TWRP. I cleaned the system folder, factory reset, wiped everything, then flashed both images again and the same thing.

Now trying to restore with LGUP, but keeps stopping at 9%. I extracted the dll and copied it into the common folder and I get the same thing.

Error: Error Code = 0x2000, Flashing Fail

Any help would be great.
[LG V20 Guides, News, & Discussion] nefus1:
The same thing is happening to me here. Any fix yet?
[LG V20 Guides, News, & Discussion] leyvatron:
Yes, where are you now?

Extract the dll file from kdz, copy the file into the common folder and make sure you rename it as the same dll that's in the folder. Rename the original dll file from the common folder. Flash with update.
[LG V20 Guides, News, & Discussion] nefus1:
Yup this worked. Thank you!
[LG V20 Guides, News, & Discussion] Daemosan:
https://xdaforums.com/v20/development/ls997vs995h910-dirtysanta-bootloader-t3519410

Is this the stock LS997 rom you're looking for?
[LG V20 Guides, News, & Discussion] KedarWolf:
My Freedom Mobile H915 V20 has no download mode. Tried Volume Up method, even from ADB, nada. :( it's still on stock firmware though, latest version. :confused:
[LG V20 Guides, News, & Discussion] ZachJohnson:
A curiosity question with this...

I'm on Verizon and rooted, and it seems as though my vibration motor has died or something, I'm not getting anything buzzing. So I'm looking to unroot and return to stock so I can swap my phone with Verizon. It appears as though this will accomplish that...

If I should I get a new phone that's beyond the Android security patch where DirtySanta won't be able to unlock the bootloader, would this method work to get around that? I'm just wondering if I'd be able to apply say the vzw 12a kdz file over something newer. I'd hate to swap phones if I'd lose the ability to root, I'd rather deal with no buzzing or just have it repaired in that case...
[LG V20 Guides, News, & Discussion] b0xy:
Thanks, just worked for me on tmobile. Had to extract the DLL from the kmz.

Here is the DLL for H918. Place the common folder in Program Files (x86)\LG Electronics\LGUP\models.

www[dot]mediafire[dot]com/file/ld89608muhi6me1/common.zip
[LG V20 Guides, News, & Discussion] shadow322:
OK I have 10D with TWRP and Root I can just flash this and just re-root after?
[LG V20 Guides, News, & Discussion] cwis:
Will this work on the ATT H910 variant?
[LG V20 Guides, News, & Discussion] GilesMoxom:
Giving this a crack now. Thanks so much for putting this up!
[LG V20 Guides, News, & Discussion] emdroidle:
I haven't tried and thus cannot say with certainty, but given previous reports on LGUP this is very likely to manage this. You would need the "refurbish" option, which will erase the user data, but has been successful with previous LG devices.

Most likely even the 10c H990DS KDZ is still susceptible to DirtyCow. While it was released after the security update fixing DirtyCow came out, it still merely had the Dec 01 updates.
[LG V20 Guides, News, & Discussion] GilesMoxom:
Is there an alternate dl for the kdz? im getting between 0 and 50 kbps of the link in first post. at this rate it will take days to get it.