Help downgrading firmware LG V20 H91810K - LG V20 Questions & Answers

I just bought a LG V20 H91810K and I was wondering how to downgrade the firmware so I can root it. I've read one of the post on downgrading it to h91810j but i'm new to this so i really don't know how to go about doing that. I've downloaded LGUP onto my PC. Can you guys point the way? Tutorial writeup or vids of some kind on how to downgrade? I'll try to figure out the rest once I've downgraded.

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Lg V20 downgrade firmware

Can the T-mobile Lg V20 H91810i firmware be downgraded back to H91810d.
No considering it has AntiRollBack01
EDIT: I do apologize. It is AntiRollBack00 still. the possibility is there to downgrade but you will need a v10d KDZ.

[H918] Downgrade to V10d (stock)?

Hey guys, I'm trying to downgrade from 10i to the original and dirty cow vulnerable 10d. I've found a tot file but it fails LGUP and from what i've read that's because there isn't a signed version of 10d. Has anyone else found a way to force the downgrade?
Thanks,

Using another kdz on LG v20 AT&T model

I have a question I was thinking of using the h915 kdz on my AT&T LG v20 variant. I saw the post about using patched lgup with common dll. I tried this method without success. Lgup kept saying that I it cannot flash h915 to h910. I cannot seem to get around this. My query is can I use another carrier kdz on my phone and which one should I use? And an someone assist with the process? By the way I am using LG V20 H810 currently on nougat. Stock firmware don't want to lose root, just want Android Oreo. Thanks in advance. Also is there an easier way to gain root besides dirty Santa. Seems so lo d and risky.
roger fontenelle said:
I have a question I was thinking of using the h915 kdz on my AT&T LG v20 variant. I saw the post about using patched lgup with common dll. I tried this method without success. Lgup kept saying that I it cannot flash h915 to h910. I cannot seem to get around this. My query is can I use another carrier kdz on my phone and which one should I use? And an someone assist with the process? By the way I am using LG V20 H810 currently on nougat. Stock firmware don't want to lose root, just want Android Oreo. Thanks in advance. Also is there an easier way to gain root besides dirty Santa. Seems so lo d and risky.
Click to expand...
Click to collapse
Use pathed LGUP file in thread:
[GUIDE][UNBRICK] Patch LGUP to unlock features & unbrick V20 (Variant mismatch fix)
and you will can to flash h915 kdz, or us996 kdz. Don't flash other kdz, you will loose your phone.
only one method to access root -- dirty santa.
You can just run follow the instructions in the root thread https://forum.xda-developers.com/v20/how-to/root-h910-v10m-t3664500 on any version H910. Backup anything you need, including from the internal storage and SD card, before you start.
Follow the instructions exactly as written,until they tell you to flash the h910-10r ZIP. Go here, https://forum.xda-developers.com/v20/development/h910-att-lg-v20-stock-oreo-rooted-t3846384 get the proper version of TWRP, download the v20h ZIP, download the proper mk2000 kernel, and the Magisk 17.1 ZIP,then flash the rooted v20h ZIP.
https://forum.xda-developers.com/v2...g-v20-stock-oreo-rooted-t3846384/post77837311
Done.
Sent from my elsa using XDA Labs

Can I Convert My LG G6 H873 To The LG G6 H872 For Rooting Purposes?

It has come to my attention that the H873 is not (yet) rootable, and may never receive a root. Though that is a bummer, while looking for possible ways to root, I have read many forum-posts relating to the conversion of a H872 device to a H873, in order to receive the Android 9 update. So, is the vice-versa possible? Can I change my H873 to the H872, and root it from there? Any answer will be greatly appreciated. Thanks for reading.
No. You will brick your device.
DuringSummer said:
No. You will brick your device.
Click to expand...
Click to collapse
Thanks for the reply. Soft brick, or Hard brick? Has it been confirmed that bricking will occur? If so, then how did people swap from H872 to H873, all without bricking their phone, and without the need for root?
Hard. People can change H872 to H873 and install Android 9 on it is because they're still installing an official OS on their phones.
Rooting and installing Custom ROM requires an unlocked bootloader and a custom Recovery.
Installing a custom Recovery over a locked bootloader can cause a hard brick.
DuringSummer said:
Hard. People can change H872 to H873 and install Android 9 on it is because they're still installing an official OS on their phones.
Rooting and installing Custom ROM requires an unlocked bootloader and a custom Recovery.
Installing a custom Recovery over a locked bootloader can cause a hard brick.
Click to expand...
Click to collapse
Don't get me wrong. I mean to flash the official stock Firmware of the H872 onto my H873, so, there is no rooting/custom recovery/custom ROM required. I have already rolled back to Android 7 for the H873, so I know how to use LG UP and things of the like.
What is it that you want to do? If you don't want to root, why bother flashing 872 firmware to your 873? Do you not already have the latest update on H873?
I'll say this once again, flashing H872 onto H873 will not get you root. If your plan is to convert your H873 to H872 and then root it, it will still fail. Because you need an unlocked bootloader to root.
The only two devices to get unlocked bootloader are H870 (EU) and H872 (T-Mobile).
DuringSummer said:
What is it that you want to do? If you don't want to root, why bother flashing 872 firmware to your 873? Do you not already have the latest update on H873?
I'll say this once again, flashing H872 onto H873 will not get you root. If your plan is to convert your H873 to H872 and then root it, it will still fail. Because you need an unlocked bootloader to root.
The only two devices to get unlocked bootloader are H870 (EU) and H872 (T-Mobile).
Click to expand...
Click to collapse
Aren't there unofficial ways to unlock the H872? And even if there aren't, if I were to convert to the H872, will that not allow me to unlock via the official website? Also, i don't really care which model I convert to, so long as it works. I am willing to convert to H870, or the US997; It does not matter.
TipTopHiatus said:
Aren't there unofficial ways to unlock the H872? And even if there aren't, if I were to convert to the H872, will that not allow me to unlock via the official website? Also, i don't really care which model I convert to, so long as it works. I am willing to convert to H870, or the US997; It does not matter.
Click to expand...
Click to collapse
The "official" method won't work because even if you flash H870/US997 firmware to your H873 you still can't unlock your device as the "unlocked code" required to unlock BL is tied to your device ID and IMEI, you changing your firmware will not change that.
Same with H872. The H872 can be unlocked because T-Mobile does not lock their bootloader, you changing the firmware of your H873 to H872 will not allow you to unlock. And very likely you'll end up with a hard brick from which you can't recover.
If you still want to be experimental, go ahead.
DuringSummer said:
The "official" method won't work because even if you flash H870/US997 firmware to your H873 you still can't unlock your device as the "unlocked code" required to unlock BL is tied to your device ID and IMEI, you changing your firmware will not change that.
Same with H872. The H872 can be unlocked because T-Mobile does not lock their bootloader, you changing the firmware of your H873 to H872 will not allow you to unlock. And very likely you'll end up with a hard brick from which you can't recover.
If you still want to be experimental, go ahead.
Click to expand...
Click to collapse
Thanks. I'll ask around on more forums, and see if I can do something. Worse case scenario, I either wait for an unofficial root to be released, or just try swapping for a H872. Again, thanks for the help.
There won't be "official" or even "unofficial" unlock for the phone. The bootloader is locked by the carrier and therefore there won't be any official unlock, and the phone is old and the development scene for this phone isn't as impressive and this is why there won't be any unofficial unlock method.
Your best bet is swapping your model with H870/H872/US977
DuringSummer said:
There won't be "official" or even "unofficial" unlock for the phone. The bootloader is locked by the carrier and therefore there won't be any official unlock, and the phone is old and the development scene for this phone isn't as impressive and this is why there won't be any unofficial unlock method.
Your best bet is swapping your model with H870/H872/US977
Click to expand...
Click to collapse
There is hope! 6 days ago, somebody was asking a question for the H873. It seems that they're trying to form a root. In addition to that, not too long ago, there was an app that gave root access. I'm not sure if it's permanent, though, and, apparently, since it's not done, it gives all apps root access, instead of the ones that you grant root access to. I don't think this scene is dead, given those two forums. Guess we'll just have to keep our chins up.
TipTopHiatus said:
Don't get me wrong. I mean to flash the official stock Firmware of the H872 onto my H873, so, there is no rooting/custom recovery/custom ROM required. I have already rolled back to Android 7 for the H873, so I know how to use LG UP and things of the like.
Click to expand...
Click to collapse
Can u please tell me how did u rolled back to nougat. I've updated my h873 to pie now it's super laggy. Can u help me please :crying:
ThisizAkib4747 said:
Can u please tell me how did u rolled back to nougat. I've updated my h873 to pie now it's super laggy. Can u help me please :crying:
Click to expand...
Click to collapse
I don't remember exactly how I did it, but I remember following a guide off of XDA, so, it should be around here somewhere. Also, if you haven't already, I'd recommend factory resetting after an upgrade/downgrade. My phone used to lag as well, but, after factory-resetting, it works like a charm. I wish you luck on your venture. Make sure to use the correct firmware! Apparently, it'll brick the device if you flash a different model's firmware.
TipTopHiatus said:
I don't remember exactly how I did it, but I remember following a guide off of XDA, so, it should be around here somewhere. Also, if you haven't already, I'd recommend factory resetting after an upgrade/downgrade. My phone used to lag as well, but, after factory-resetting, it works like a charm. I wish you luck on your venture. Make sure to use the correct firmware! Apparently, it'll brick the device if you flash a different model's firmware.
Click to expand...
Click to collapse
Thanks for the info .
I've tried some XDA guide but none of them are working for me.
Hoping i will find some other thread that would work.
Thanks for replying
Im having h873, and i want to install custom rom but nothing is getting to unlock bl or to install custome rom...im disapointed
---------- Post added at 09:04 AM ---------- Previous post was at 09:03 AM ----------
TipTopHiatus said:
I don't remember exactly how I did it, but I remember following a guide off of XDA, so, it should be around here somewhere. Also, if you haven't already, I'd recommend factory resetting after an upgrade/downgrade. My phone used to lag as well, but, after factory-resetting, it works like a charm. I wish you luck on your venture. Make sure to use the correct firmware! Apparently, it'll brick the device if you flash a different model's firmware.
Click to expand...
Click to collapse
If you found a way plz tell me

LG V20 910 Flashing changes?

I have a LG V20 910 (att version) that has never been flashed and last security patch was March 2017. Roll back is allowed. I am trying to install TWRP. I am currently looking over the guides mentioned in this forum. Is there anything new I should be aware of?
I tried following this guide but several of the files needed to be downloaded are no longer available.
[ROOT] HOWTO: AT&T H910 up to v20g (FULLY TESTED)
***WARNING*** This is ONLY for the H910. If you flash H915 firmware on an H918 -- you WILL brick it. If you are currently on Oreo, you can root your phone, but you CAN NOT keep Oreo - for now. This will downgrade you back to Nougat, which is...
forum.xda-developers.com
Ryu945 said:
I tried following this guide but several of the files needed to be downloaded are no longer available.
[ROOT] HOWTO: AT&T H910 up to v20g (FULLY TESTED)
***WARNING*** This is ONLY for the H910. If you flash H915 firmware on an H918 -- you WILL brick it. If you are currently on Oreo, you can root your phone, but you CAN NOT keep Oreo - for now. This will downgrade you back to Nougat, which is...
forum.xda-developers.com
Click to expand...
Click to collapse
I struggled with that guide but managed to root with this & some help in lg v20 telegram group
[Guide][Tutorial] Root TWRP LG V20 using Dirtysanta[Most Variants][Noobfriendly]
Good day, Here's the modified dirtysanta method to root LG V20 and install TWRP. This guide will help you in rooting your device with much easier situation. Before you begin: (Your phone's internal storage will be wiped or simply formatted or...
forum.xda-developers.com

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