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Root/downgrade options for H81020n

I had to make an insurance claim on my AT&T G3 recently and they sent me a G4 Android 6.0 / h81020n, build MRA58k. From what I understand, there's no way to root it and many don't expect there will be for a while...is that right? If so, what are my best options to downgrade and then root it? It's my only phone, and though I'm extremely competent with this stuff, I need to be sure it's a surefire method of downgrading. Thanks

noamo48 said:
I had to make an insurance claim on my AT&T G3 recently and they sent me a G4 Android 6.0 / h81020n, build MRA58k. From what I understand, there's no way to root it and many don't expect there will be for a while...is that right? If so, what are my best options to downgrade and then root it? It's my only phone, and though I'm extremely competent with this stuff, I need to be sure it's a surefire method of downgrading. Thanks
Click to expand...
Click to collapse
As of now, I'm going to be bold with my statement about the G4: The AT&T cannot and will not ever have an unlocked bootloader. I would also assert the likelihood of root on Marshmallow is slim to none. I'd say "none", except there's always a remote chance that someone with the time/money/know-how will decide not to give up until they've figured it out.
When you say "downgrading", I presume you mean going back to a previous build? If so, it is not possible. It would require the level of access that only an unlocked bootloader could provide, from what I understand. I think there was mention of some sort of bypass option that works on other devices, but it doesn't work with this one.
Long story short: get comfortable with your current experience, because it isn't likely to ever change with this device. I too had to replace my device under warranty (for the 2nd time), and was bummed when the replacement arrived having Marshmallow on it.

noamo48 said:
I had to make an insurance claim on my AT&T G3 recently and they sent me a G4 Android 6.0 / h81020n, build MRA58k. From what I understand, there's no way to root it and many don't expect there will be for a while...is that right? If so, what are my best options to downgrade and then root it? It's my only phone, and though I'm extremely competent with this stuff, I need to be sure it's a surefire method of downgrading. Thanks
Click to expand...
Click to collapse
I have not been able to downgrade H81020n since I got a replacement phone due to the infamous bootloop issue. I'm starting to wonder if somehow AT&T with or without support of LGE figured out which phones were rooted and injected some network packets to stress the radios in this device causing failures.
What's really unfortunate is the replacement devices all come with Marshmallow 6.0 on the H81020n ROM. That locked-down image, with the locked bootloader have made this device much less fun.
I've tried several downgrade paths with no success; the low-effort Root method, TOT downgrades with the LG flash utility, and good old fashioned send_commands.exe for image restoration to stock.

You need to use LGUP
http://forum.xda-developers.com/showpost.php?p=66316842&postcount=113

smknutson said:
You need to use LGUP
http://forum.xda-developers.com/showpost.php?p=66316842&postcount=113
Click to expand...
Click to collapse
I have LGUP and the .tot file. LGUP just won't allow me to flash it for some reason ?....
Sent from my LG-H810 using XDA-Developers mobile app

BTMoneyGang said:
I have LGUP and the .tot file. LGUP just won't allow me to flash it for some reason ?....
Sent from my LG-H810 using XDA-Developers mobile app
Click to expand...
Click to collapse
Did you load the.tot, close the LGUP program then reopen it and attempt the flash?
Did you change the Port # in Device Manager?

Can the same downgrade be done on 21y for h810 I miss root

Oreo released for the H872 (T-Mobile G6)

Yep, Oreo has started rolling out for the H872 G6.
Now, why am I posting this in the V20 forums? Well, for one, the V20 shouldn't be too far behind the G6 since the SD821 and SD820 are so similar. As a matter of fact, they are so similar that I was able to root the H872 using the H918 laf.
Also, as soon as I can get my hands on the Oreo KDZ, I will see just what LG has done security wise. I doubt it will be much different for the V20.
Lastly, I intend to take the H872 system image, and get (at least) the H918 Oreo early. Getting H872 Nougat running on the H918 was no big deal (no reason to release it since WE have Nougat), I can't imagine that Oreo will be any different.
-- Brian

runningnak3d said:
Yep, Oreo has started rolling out for the H872 G6.
Now, why am I posting this in the V20 forums? Well, for one, the V20 shouldn't be too far behind the G6 since the SD821 and SD820 are so similar. As a matter of fact, they are so similar that I was able to root the H872 using the H918 laf.
Also, as soon as I can get my hands on the Oreo KDZ, I will see just what LG has done security wise. I doubt it will be much different for the V20.
Lastly, I intend to take the H872 system image, and get (at least) the H918 Oreo early. Getting H872 Nougat running on the H918 was no big deal (no reason to release it since WE have Nougat), I can't imagine that Oreo will be any different.
-- Brian
Click to expand...
Click to collapse
Ahh awesome
Sent from my LG-H918 using XDA Labs

So, a little update. Oreo will NOT boot on Nougat firmware.
I thought maybe I was missing something, so I had someone with a G6 test it to make sure that it wasn't a bad port that I had done. They flashed Oreo boot and system, and no go.
It is even worse. Partitions that I thought were readonly got messed up on my V20, and if I wouldn't have had a full dump, I would have had a brick.
I could probably go through and figure out what they did, but I am not wasting my time till V20 Oreo is available.
TL;DR: LG *HAS* added security to Oreo.

runningnak3d said:
So, a little update. Oreo will NOT boot on Nougat firmware.
I thought maybe I was missing something, so I had someone with a G6 test it to make sure that it wasn't a bad port that I had done. They flashed Oreo boot and system, and no go.
It is even worse. Partitions that I thought were readonly got messed up on my V20, and if I wouldn't have had a full dump, I would have had a brick.
I could probably go through and figure out what they did, but I am not wasting my time till V20 Oreo is available.
TL;DR: LG *HAS* added security to Oreo.
Click to expand...
Click to collapse
So you're saying is if you want to keep root better stay on nougat
Sent from my LG-H910 using XDA Labs

No, we won't have to stay on Nougat. However, if someone doesn't have root now, getting root once the Phone is on Oreo will be a lot harder if it is possible at all. I can't say for certain until I have the V20 version.
To elaborate, the rooted laf image that I have that passes the SIGN hash check, is from Nougat so it won't boot on Oreo firmware....
-- Brian

runningnak3d said:
No, we won't have to stay on Nougat. However, if someone doesn't have root now, getting root once the Phone is on Oreo will be a lot harder if it is possible at all. I can't say for certain until I have the V20 version.
To elaborate, the rooted laf image that I have that passes the SIGN hash check, is from Nougat so it won't boot on Oreo firmware....
-- Brian
Click to expand...
Click to collapse
Root while you can! Read somewhere someone saying that once on oreo you won't be able to go back to nougat any truth to that? Doesn't sound right to me.
Sent from my LG-H910 using XDA Labs

If they increment ARB then no, you won't be able to go back. However, I don't know about other carriers, but T-Mobile has never incremented ARB on the first version of a new OS release in case there are problems.
Again, that part is speculation. I can only say for certain that Nougat kernels will not boot with Oreo firmware, and Oreo kernels will not boot with Nougat firmware -- so having a hybrid system isn't going to be possible.
-- Brian

http://opensource.lge.com/osSch/list?types=ALL&search=f800
Oreo sources for the Korean variant has been posted also.

So another update. I have managed to boot the H872 Oreo system on H918 Nougat firmware. I am having a little trouble getting the screen to init properly, so it isn't usable.
I am going to keep putzing with it, and see if I can get a usable screen.
Bottom line though is this gives me hope that we can all keep root even if LG throws some more crap in to try and prevent Oreo from running on Nougat firmware, and the Oreo firmware locks the phone down.
-- Brian

Keep it up bro , i am following your thread

runningnak3d said:
So another update. I have managed to boot the H872 Oreo system on H918 Nougat firmware. I am having a little trouble getting the screen to init properly, so it isn't usable.
I am going to keep putzing with it, and see if I can get a usable screen.
Bottom line though is this gives me hope that we can all keep root even if LG throws some more crap in to try and prevent Oreo from running on Nougat firmware, and the Oreo firmware locks the phone down.
-- Brian
Click to expand...
Click to collapse
brian thank you for taking the time for this work. Is there any way I can get the kdz? or is it just the g6(h872) t0t or kdz?

It is the H872 KDZ, and you can get it from lg-firmwares.com.
-- Brian

Android Oreo H915 KDZ on H910 Aliexpress Refurbished will brick my phone?

I have a H910 V20 bought in AliExpress. I can't update the phone, because I live in Brazil and have no AT&T here. I'd like to only update to Oreo without root. I think my phone has no root. I saw that only install the H915 KDZ firmware it goes to Oreo without the AT&T apps. But I'm afraid of the phone is not original H910 and I brick my phone after the update. How do I know if my V20 won't brick after the update? And what version of the H915 do I have to install? Here says H91010m, build NRD90M. Is only install with LGUP software. Can you halp me?

Gonna be honest with you:
Since you're on the H910 model (AT&T) and since there has never been a kdz for this variant. The only true way to install an update from official to official would be to use mobile data service and get the update rolled out to you via OTA. What i am saying is unless you root your phone, you'll be stuck on nougat stock. I say root your phone and download RR Second Screen builds, they are solid and worthy of a try but if that is not what interest you then no dice i guess. I might be wrong but that seems to be what i know of the H910.
Edit: If it happens to not be H910 then you may be in luck. I am useless on this but thought since i saw this, i would pitch in.

But I have to root? In the case I Just want the Android 8 Oreo. I do not want the root. Whats happen If I install the H915 Oreo KDZ? It Will brick? I Saw people talking that 915 firmware ia similar to the H910, but ia better because hás no ATT apps. It Works on H910?

wesley_fg said:
But I have to root? In the case I Just want the Android 8 Oreo. I do not want the root. Whats happen If I install the H915 Oreo KDZ? It Will brick? I Saw people talking that 915 firmware ia similar to the H910, but ia better because hás no ATT apps. It Works on H910?
Click to expand...
Click to collapse
Don't need root. You can use patched LG up program to partition DL which would cross flash whole firmware to the h915 Oreo.
It should work fine without root with everything running.

wesley_fg said:
But I have to root? In the case I Just want the Android 8 Oreo. I do not want the root. Whats happen If I install the H915 Oreo KDZ? It Will brick? I Saw people talking that 915 firmware ia similar to the H910, but ia better because hás no ATT apps. It Works on H910?
Click to expand...
Click to collapse
you can use my Oreo Rom I posted here > https://forum.xda-developers.com/showpost.php?p=77435592&postcount=64
this will wipe your phone but you will still be H910

darkknight200 said:
Don't need root. You can use patched LG up program to partition DL which would cross flash whole firmware to the h915 Oreo.
It should work fine without root with everything running.
Click to expand...
Click to collapse
I have a stock H910 ROM (NOugat) with no root, I heared some poeple had cellular reception problems, is this a true problem please ? Will I have to do somthing before flashing Canada KDZ on H910 ? Thanks.

Android 9 Pie .kdz

Well I've obtained the actual .kdz file from the pre beta program in Korea. Now too flash it into my Canadian g710awm. The firmware is actually for model# g710N so wish me luck...

ryn.ste said:
Well I've obtained the actual .kdz file from the pre beta program in Korea. Now too flash it into my Canadian g710awm. The firmware is actually for model# g710N so wish me luck...
Click to expand...
Click to collapse
Can u share the link I wanna try it also

ryn.ste said:
Well I've obtained the actual .kdz file from the pre beta program in Korea. Now too flash it into my Canadian g710awm. The firmware is actually for model# g710N so wish me luck...
Click to expand...
Click to collapse
Is it a 8.0 kdz to update to 9.0 or directly a 9.0 kdz?

Did it work?

MishaalRahman said:
Did it work?
Click to expand...
Click to collapse
Lack of response, I'm gonna guess no? LoL

dah brick dah bricks.

???

The suspense is killing me. Personally I'm waiting for the official, but it would be nice to know...

i guess i would be able to flash it on my g7 , but i only have a .up file instead of a kdz and that doesnt work

Warning!
From what I read recently; LG has started to use unique RSA keys for each device (within a group, i.e G7) starting with V35 (I think), thus flashing a KDZ from another G7 would definitively cause hardbrick.
Edit: Apparently this was (mostly?) wrong. At least some confirmed models can be cross-flashed.

askermk2000 said:
Warning!
From what I read recently; LG has started to use unique RSA keys for each device (within a group, i.e G7) starting with V35 (I think), thus flashing a KDZ from another G7 would definitively cause hardbrick.
Click to expand...
Click to collapse
I thought that was only for TMoile but not the rest of variants?

GROOVYJOSHCLARK said:
I thought that was only for TMoile but not the rest of variants?
Click to expand...
Click to collapse
Well, like I said, not anymore.
IIRC, this is what @runningnak3d said in a tread somewhere (I don't recall exactly, maybe V30 forums).
He is the current resident expert on LG root, and bootloader matters. At least the most active one, and he's provided root for many previous LG devices.

askermk2000 said:
Well, like I said, not anymore.
IIRC, this is what @runningnak3d said in a tread somewhere (I don't recall exactly, maybe V30 forums).
He is the current resident expert on LG root, and bootloader matters. At least the most active one, and he's provided root for many previous LG devices.
Click to expand...
Click to collapse
I am definitely not arguing as I dont know the answer 100% myself.
What I DO know for sure is that I can, (and I have) flashed other LG G7's firmware on my G7 (Sprint) through my Octoplus box. This is using the Octoplus box, not LGUP, but if the RSA keys were an issue, I would expect it to not work (flashing another variant .KDZ), or I would expect the device not to work (boot) afterwards. It boots and works just fine. I also know of numerous others who have converted their LG G7's (except TMobile) to the unlocked model (ULM). My understanding was that only the TMobile ones were using a custom RSA key coming FROM TMobile themselves (I could be wrong but this is what I read) and since I dont own a TMobile flavor, I cant test myself to confirm.

In that case maybe I remember wrong, or runningnak3d statement was not accurate (maybe doesn't apply to G7 specifically).

askermk2000 said:
In that case maybe I remember wrong, or runningnak3d statement was not accurate (maybe doesn't apply to G7 specifically).
Click to expand...
Click to collapse
All good, I dont know for sure myself so I cant confirm nor deny anything except for my personal Octoplus flashing. I just want ROOT, thats what I am pressing through to figure out how to achieve. I HATE that LG locks the bootloaders, if I had known prior, I would NEVER have switched from HTC!
LG mobile will go out of business soon enough if they dont cut the crap.

Yeah, not to mention that we don't have a way to fix ourselves bricked devices. It would be a trivial matter with a simple qualcomm type firehose-file.
Instead now it's basically dead weight. They seem to think it's ok to produce lots of electronic garbage, and not make efforts to reduce this.

askermk2000 said:
Yeah, not to mention that we don't have a way to fix ourselves bricked devices. It would be a trivial matter with a simple qualcomm type firehose-file.
Instead now it's basically dead weight. They seem to think it's ok to produce lots of electronic garbage, and not make efforts to reduce this.
Click to expand...
Click to collapse
Exactly, hopefully the drop in sales will be enough to kick their butt's in gear BEFORE they become the next Blackberry! If they would simply give us a restore KDZ, we would love LG, instead, they lock us out, and make it damn near impossible to restore or recover our devices from normal things, such as a bad OTA updates. BUT NO, for some dumb A$$ reasons, they dont so it WILL be their demise. Its almost like being able to see the future. If they took notice of all the predecessors before them, all their mistakes, made changes then history wouldn't have to repeat itself. If not, LG will be another forgotten company no one gives a crap about.

GROOVYJOSHCLARK said:
I am definitely not arguing as I dont know the answer 100% myself.
What I DO know for sure is that I can, (and I have) flashed other LG G7's firmware on my G7 (Sprint) through my Octoplus box. This is using the Octoplus box, not LGUP, but if the RSA keys were an issue, I would expect it to not work (flashing another variant .KDZ), or I would expect the device not to work (boot) afterwards. It boots and works just fine. I also know of numerous others who have converted their LG G7's (except TMobile) to the unlocked model (ULM). My understanding was that only the TMobile ones were using a custom RSA key coming FROM TMobile themselves (I could be wrong but this is what I read) and since I dont own a TMobile flavor, I cant test myself to confirm.
Click to expand...
Click to collapse
What partitions did you flash?
All of the KDZs I have been able to pull down have different RSA certs (granted it is only a couple) but it is not just the TMO that was different.
If you don't mind, link to the exact KDZ for your model, and the KDZ that you flashed -- I would love to compare the certs.
-- Brian

runningnak3d said:
What partitions did you flash?
All of the KDZs I have been able to pull down have different RSA certs (granted it is only a couple) but it is not just the TMO that was different.
If you don't mind, link to the exact KDZ for your model, and the KDZ that you flashed -- I would love to compare the certs.
-- Brian
Click to expand...
Click to collapse
There is no KDZ for the PM (Sprint model) yet so I cannot go back to Sprint or link to one (until one is released) but I wish there was one for others who are in a loop or brick situation, here are the 2 I used:
EM (European Model - bootload unlockable approved by LG):
G710EM10b_00_0521.kdz
https://drive.google.com/file/d/1W14Y-jbvnwDt4UOfitni8hDGfwYsXesV/view?usp=sharing
ULM (US Unlocked Model):
G710ULM10g_00_NAO_US_OP_0913.kdz
http://pkg02.lime.gdms.lge.com/dn/d...XADM55F9FR80/G710ULM10g_00_NAO_US_OP_0913.kdz
I flash ALL partitions through Octoplus EXCEPT the modems (MODEM1/2), I left those from Sprint (stock), not sure if it helps or not, but I have service so I like to think it did. There are lots of users who have also used the LGUP (somehow) to cross flash the KDZ's to the ULM (unlocked) model but I haven't personally used this LGUP method so I cant comment if its valid or not. Octoplus, most definitely works though (and I have the logs to show the partitions if one was interested).

GROOVYJOSHCLARK said:
There is no KDZ for the PM (Sprint model) yet so I cannot go back to Sprint or link to one (until one is released) but I wish there was one for others who are in a loop or brick situation, here are the 2 I used:
<snip>
Click to expand...
Click to collapse
There will never be a Sprint KDZ -- neither Sprint or AT&T release KDZs (I don't think they even use them internally).
I am downloading them now, and I will pull the certs / post the results as soon as they are done.
Thanks!
-- Brian

how do i update/ convert my v20???

i just ordered an lg v20 at&t model, and would like to know how to either update it or convert it to the unbranded version, as I am from the UK. Is it also possible it can be done without root, and by just using the software flashing tool?
thanks

sol.j146 said:
i just ordered an lg v20 at&t model, and would like to know how to either update it or convert it to the unbranded version, as I am from the UK. Is it also possible it can be done without root, and by just using the software flashing tool?
thanks
Click to expand...
Click to collapse
Yeah, grab yourself the modded version of LGUP, download the KDZ (Most likely US996) and flash it. No root involved.

I'm in the same boat as the OP, in the UK.
I broke my International version HD990DS which I've had for a couple of years, and scored a replacement H910 on ebay (£115, sealed in box, 2019 date on battery). I received it this morning.
I wasn't aware when I bought it that it was an AT&T brand (unlocked), on Android 7, and un-updateable OTA here in the UK.
The kdz I'm downloading is 'US99620f_00_1120.kdz' from here: https://www.mylgphones.com/unlocked-lg-v20-us996-received-oreo-update-us99620f.html
Should this be good to go? I'm not aware what bands this enables. The bands EE use here are 1,3,7 & 20.
Is there a 'better' kdz I should be downloading?
TIA.
[edit] further to the above, for any UK EE users, the page here gives EE APN details which will need inputting if your phone isn't going to be a wifi only paperweight. Other operators and phones are listed in the site:
https://apn-uk.gishan.net/en/apn/ee/lg-v20
In this page you'll note EE does not support the H915 for 4G at all.
The H910 isn't listed, but it is supported for 4G by EE.[/edit]

Excudent said:
Yeah, grab yourself the modded version of LGUP, download the KDZ (Most likely US996) and flash it. No root involved.
Click to expand...
Click to collapse
Modded LGUP says : "Error:KDZ file is invalid' H910->US996"
I wish it had been that simple....
Anyone any pointers?

stateit said:
Modded LGUP says : "Error:KDZ file is invalid' H910->US996"
I wish it had been that simple....
Anyone any pointers?
Click to expand...
Click to collapse
to flash cross model use partition dl mode, select all partitions. iirc
(not applicable to you specifically, but as a reminder to anyone else who reads this)
Remember, never ever flash (T-mobile) H918 firmware on anything but an H918, and if you have an H918 never ever flash another model's firmware. Instant permanent brick.

Thanks for your input. I'll give it a go tonight.
With LGUP does "DUMP" fo a restorable backup?
I've not used LGUP before a couple of days ago. I used to use Odin a lot, but that was years ago (see my forum join date...)
[edit] OK, I've found what I need to know about LGUP here: https://9to5lg.com/lgup-1-15-manual-how-to-unbrick-restore-your-lg-devices-with-lgup/ [/edit]

stateit said:
Thanks for your input. I'll give it a go tonight.
With LGUP does "DUMP" fo a restorable backup?
I've not used LGUP before a couple of days ago. I used to use Odin a lot, but that was years ago (see my forum join date...)
[edit] OK, I've found what I need to know about LGUP here: https://9to5lg.com/lgup-1-15-manual-how-to-unbrick-restore-your-lg-devices-with-lgup/ [/edit]
Click to expand...
Click to collapse
Did you manage to get oreo on H910? My mother has a H910 stuck in Nougat, but I'd like her to get the oreo update without having to mess with root or anything hard for her to use.

Not yet... I'm waiting until I've had the crap annoyed out of me enough before I invest the few hours time to put everything back on this phone that I want.
As all partitions have to be rewritten then its a case of starting from a totally fresh phone. Which is a chore that I'll do sometime, but not until this week at least is of the way....

Salvaparalyzer said:
Did you manage to get oreo on H910? My mother has a H910 stuck in Nougat, but I'd like her to get the oreo update without having to mess with root or anything hard for her to use.
Click to expand...
Click to collapse
Lgup patched linked above using partial download you can load Oreo from us996 or h915. H915 = H910 only Canadian version with respective network software.

Salvaparalyzer said:
Did you manage to get oreo on H910? My mother has a H910 stuck in Nougat, but I'd like her to get the oreo update without having to mess with root or anything hard for her to use.
Click to expand...
Click to collapse
I'm using H91520a_00_RGS_CA_OP_0717.kdz
Downloaded from LG-Firmwares here: https://lg-firmwares.com/downloads-file/...
IIRC it was the world's slowest download, reminiscent of using a dial-up modem (well, almost).
The H915 is the canadian version of the US H910, so no worries about hardware incompatibilities
Update in patched LGUP (using 'partitions.dl' option) took about 5 minutes and was painless (one warning screen popped up at start of f/w update process in LGUP saying USB was disconnected, but I ignored this throughout the update and left it showing) .
APN numbers need to be added
I backed up data (phone logs, messages etc) first in LG Mobile Switch app first, saving to SD Card. Which I took out of the phone first before the update 'just in case'.
No more AT&T crap, and Android 8.0.0, which is back to how my last V20 990DS was before I broke it (water damage).
It's a bargain phone for £120 on eBay. Good luck!