yashsingh1/xdaforums huggingface dataset:
[LG G8 Guides, News, & Discussion] AsItLies:
So just to clear up a few things; The bands you'll have will be specific to the rom, if you look under that specific rom info, it will list the bands it has (they are usually accurate, but occasionally not).

The hidden menu you saw listing bands is not a list to 'enable any band I want to'. It's a list, which yes that list is the same on any rom, to TEST if that band is available or not, which it won't be, if the rom doesn't list it as included. (that's why it's the same list on all roms, meaning you can test for any of them, but it doesn't mean it will connect with that band).

The thing with the prompt to change; some people have had it come up, some haven't. I did once, other times not. But it's essentially irrelevant. In my case, changing it didn't seem to change anything else at all. Personally, I'd completely ignore whether you get that or not.

Lastly, it's always going to be the 'OPEN' roms that will have the most bands enabled.

Cheers, good luck. One suggestion; question your assumptions, ask if it's a correct assumption, because many times we assume things that are not accurate. We all do it, then we have a 'duh' moment ;)
[LG G8 Guides, News, & Discussion] cbmboy:
Thank you very much for the detailed reply!

I was hoping the hidden menu was connected to the ROM and therefore showed what was enabled. I appreciate you clarifying that is not the case - good information!

I came to the conclusion that the prompt didn't matter as well. I don't know why I was stuck on it - just wanted to make sure I was doing everything correctly I guess.

I have gotten pretty much all my "stuff" setup - checked data, call, sms, etc. and it appears everything is working fine on my carrier. I expect I should be good to go - the 30b firmware has settled in nicely - it is listed as NAO_US instead of OPEN_##... but it was much newer (30b vs 20j) and hasn't given me any problems. SO - I'll stick with it until I find a reason not to 🙃.

Thank you again for all your knowledge and help!

It was very much appreciated!

- Deadend
[LG G8 Guides, News, & Discussion] AsItLies:
You should be all set. The NAO stands for 'North American Open'. Good luck.
[LG G8 Guides, News, & Discussion] Wish39:
Yeah I'm fine with having my guidee be on the first post.
[LG G8 Guides, News, & Discussion] BereiBlue:
Can you please help me figure out why volte is working on one NA Open KDZ but not on another?

On "G850QM30b_00_NAO_US_OP_0902.kdz" volte works fine and I am able to open IMS settings from the Field Test menu.

On "G850QM30c_00_NAO_US_OP_0224.kdz" I am able to open IMS settings from the Field Test menu after flashing BUT as soon as I put in my sim card, I am no longer able to open the IMS settings, even if I remove my sim card the IMS settings will not work. When I press on the IMS setting a toast notification says "Ims(MmTel): Not Support".

I have made sure the correct MBN is loaded ( I learned from the other thread ) and made active ( also made sure it displays correctly in mcfg status ) but that does not make a difference. I have also tried flashing "Modem_A" and "Modem_B" from KDZ 30b into the phone and that also made no difference.
[LG G8 Guides, News, & Discussion] netmsm:
I don't have any knowledge about VoLTE, sorry.
[LG G8 Guides, News, & Discussion] PickleFart9:
I have now crossflashed to A12 as well on my Sprint variant G8x. The process went well overall, unfortunately not perfect:

No serial number and Check NT-Code: 0 error on every start up. I can live with those.

The phone fails to register on my service provider's sim, Visible Wireless (which is a Verizon MVNO). It does register on a Verizon sim but for LTE data only, no calling or SMS/MMS. I manually added Visible's APNs, still no dice. Same issue on two different KDZ cross flashes: an A11 QM, NA Open KDZ, and an A12 EMW.

Does anyone have any thoughts on how to resolve particularly number 2? Maybe there is a way to flash something over from the original Sprint partitions to restore the service?

Update: Flashed the new A12 US G850QM KDZ that was just released, and it solved all of my problems. I have data, calling, SMS, and MMS all working!
[LG G8 Guides, News, & Discussion] BereiBlue:
What does it show for you in the mcfg status screen?

I can't get calls to work because it is stuck on ROW_ATT and I have T-Mobile.

Also, my download speeds seem to be capped at 50Mbps before with same tower was 110+Mbps. I think that means the KDZ is using only 2 antennas instead of 4, 64QAM vs 256QAM. Upload speed is now 6Mbps before it was over 15Mbps. 😭

The signal of the phone got worse too ( same location and tower ); signal is now -110 dBm before it was -95 dBm 😭

Here is how I flashed:

1) EDL and Delete: ftm, modem_a, modem_b, sid_a, sid_b, op_a, op_b, vendor_a, vendor_b, product_a, product_b, system_a, system_b, boot_a, boot_b.

2) Download Mode and Chip Erase with the A12 US KDZ

3) Let Phone boot into OPIDMISSMATCH

4) Back into EDL and Delete the same partitions from step 1

5) Download Mode and Partition Download (unchecking Sid_a/b ) A12 US KDZ

6) Phone boot and do initial setup

7) Back to EDL and load in LUN5

8) Boot phone and imei is good but mcfg status is ROW_ATT 😭
[LG G8 Guides, News, & Discussion] PickleFart9:
Says ROW_ATT for me

My DL speeds on mu service are 35 down 5 up, my service provider is probably not comparable to yours so I dont know about any capping. This is what I expect from my service.

I didnt remove all those extra partitions or do a chip erase, I stuck to just the OP's procedure in the first post. So again my experience might not be comparable to yours.
[LG G8 Guides, News, & Discussion] BereiBlue:
Crazy yours says ROW_ATT and it works for you on non-ATT.

I'm really curious what happens on a "real" QM phone. I'll make a post to ask others.

I wouldn't be surprised if LG screwed up (or something) on their A12 rom for auto MBN selection. Even QMICM is screwed up, it is no longer working on A12.

The deletion of extra partitions is because on some phones LGUP complains about not supporting the changing of carriers, gives an error saying something about not being able to change TMO/SPR into Open.

The chip erase was just making it a clean install so there won't be any idle drain or other problems down the line.
[LG G8 Guides, News, & Discussion] AdamantiumBrain:
First of all, Thanks for the awesome guide man! I do have two questions;

1) Now, what I wanted to ask was that I have an LG G8x 901LG(Japan Softbank Variant) and would I be able to flash to Open_CA or some other kdz because this has A TON, and I mean, A TON of bloat. The reason is that I've not seen someone discuss these variants of lg G8 or G8x on this thread.

2) Would this also unlock the network as the phone is network locked by softbank and I can'r get in unlocked as I am not in japan. (I got the phone for really really cheap here). I did see some guy mention here that LG fixed that but I've seen some jap phones network unlocked by crossflashing that's why I was asking.

Thanks in advance for any help my dude!
[LG G8 Guides, News, & Discussion] netmsm:
You're welcome =)

1. Yes you can crossflash regardless of phone's variant but do not crossflash without creating backup.

2. No it won't be unlocked by crossflashing.
[LG G8 Guides, News, & Discussion] AdamantiumBrain:
Ah, oke. Guess I'll pay for a network unlock code then and crossflash to open ca later on.

Once again, Thankyou!
[LG G8 Guides, News, & Discussion] netmsm:
Glad to help ^_^

Yeah that's right.
[LG G8 Guides, News, & Discussion] joaozin12xd:
My LG G8X is G850UM but i only find the android 12 for G850EMW i can use this? and the number 6,when appers the messenge i need change the model or not?
[LG G8 Guides, News, & Discussion] netmsm:
For the first question, I'm not sure.

It won't change the model, click on yes.
[LG G8 Guides, News, & Discussion] PHANX0M:
If I have an AT&T LMG820UM and backup ALL the partitions, and restore ALL the partitions on another AT&T LMG820UM, would it work or cause any problems? Does doing that even restore it to AT&T stock ROM? How about with userdata partition?

And does anyone know if there's ANY problems with switching from AT&T ROM to something like OPEN_CA while still using AT&T network?

Maybe some of the questions you couldn't answer b/c you're from Ispahan but the first paragraph you might.
[LG G8 Guides, News, & Discussion] netmsm:
It will work properly. User data will be erased. Nothing of LUN5 will be working on another similar phone.
[LG G8 Guides, News, & Discussion] PHANX0M:
So you're saying if I backup EVERY partition on QFIL (besides userdata), and restore it, it'll be good as before, but I can't do the same thing to another of the same phone?
[LG G8 Guides, News, & Discussion] netmsm:
The backup of your device can be restored on other devices; of course the same model devices. Except LUN5, other partitions will be working on other devices. Yes it'll work as before but in some very rare cases may not. To be certain about this, you need to create a

full

backup; for that matter follow this guide.

Due to some security reasons, user data will be erased even if you have made backup of and restored it exactly on the same phone.
[LG G8 Guides, News, & Discussion] PHANX0M:
OK

And if one is Android 10 and the other is Android 11 (both AT&T) am I able to use these to downgrade the 11 one back to 10? Which would I have to flash for that?
[LG G8 Guides, News, & Discussion] netmsm:
You can crossflash to A10 from A11 or higher also you can use backup file of an A10 phone to downgrade another from A11 or higher.
[LG G8 Guides, News, & Discussion] PHANX0M:
Thank you, which partitions do I flash to go back to 10? Without it messing up or bootlooping or hardbricking. And based the partitions you named I guess you're not using QFIL.
[LG G8 Guides, News, & Discussion] netmsm:
In both restoring and crossflashing cases, all flashable partitions which are in LUN0, LUN1, LUN2, LUN4.
[LG G8 Guides, News, & Discussion] PHANX0M:
And LUN5 will brick it if I crossflash to another device? Is there anypoint in backing that up?

And can I do the crossflash LUN0-4 even if the receiving device has a different stock ROM (such as AT&T LUNs to a TMobile phone)?
[LG G8 Guides, News, & Discussion] netmsm:
I've already explained it! LUN5 can be restored on the same original phone not other similar phones and it does not relate to bricking a phone. LUN5 contains identity information of the device which are dynamically encoded by the board number and then hence are not readable on other devices.

Yes you should make backup of LUN5 and FTM at first step.

Crossflash and flash are performed automatically on LUN0, LUN1, LUN2 and LUN4 only (in LGUP).

When we use the phrase "crossflash" it means exactly what you are questioning (att to tmobile) or in general, flashing from any variant source to any different variant destination; using LGUP or Qfil, using flashing methods or backup-restore methods.
[LG G8 Guides, News, & Discussion] PHANX0M:
Tashakor bro.

One final question. What motivates you to do all this? I can't imagine...
[LG G8 Guides, News, & Discussion] PHANX0M:
Also for anyone in my situation reading all these who wanna flash something to the AT&T LMG820UM while using AT&T, do LMG820QM OPEN_US NOT LMG820UM OPEN_CA! The open US one will work perfectly, while the open CA one will not make calls, allegedly!!!!!
[LG G8 Guides, News, & Discussion] netmsm:
You're welcome =)

Motivate to do what?
[LG G8 Guides, News, & Discussion] PHANX0M:
Compile these tutorials, make these codes, and answer our questions 😂 .
[LG G8 Guides, News, & Discussion] netmsm:
In our culture one who knows about something is obligated and concomitantly obliging to share it with those who don't know.
[LG G8 Guides, News, & Discussion] arksid:
Hello, just tried to use this on my lg g8 and now i'm stuck in fastboot mode. The phone keeps on looping anytime a do a selection, say: recovery mode it powers of and then goes back to fastboot menu. Also it changed my product name to LM-V500, is there a way out of this?
[LG G8 Guides, News, & Discussion] netmsm:
Why did you do that?
[LG G8 Guides, News, & Discussion] arksid:
i wanted to get into recovery mode
[LG G8 Guides, News, & Discussion] arksid:
I had just flashed the phone with android 11 and wanted to lock the bootloader coz i needed some features that were unavailable while the phone is unlocked. The phone was running smoothly on android 11 OPEN_CA and had no problem.

But after following the steps to access receovery mode, i haven't been able to get out of fastboot menu, moreover i wasn't even able to access recovery mode
[LG G8 Guides, News, & Discussion] netmsm:
You didn't have to do that! You needed to restore the original FTM only.
[LG G8 Guides, News, & Discussion] netmsm:
It seems that some partitions are messed up. Try to use backups and restore these partitions on both A and B sides: abl, xbl, xbl_config and boot.
[LG G8 Guides, News, & Discussion] PHANX0M:
Sounds good to me! Maybe I'll be doing this on here one day.

But also.... Is there anyway to secure my phone while having unlocked bootloader? Is it true that anyone can flash TWRP or smnth and just bypass the lockscreen w/ that?? And I assume I can't relock the bootloader with a custom ROM on LG G8 THINQ.
[LG G8 Guides, News, & Discussion] netmsm:
Glad to hear that ^_^

For the first question I'm afraid to say no.

I haven't heard of such a possibility that the lock-screen can be broken this easily especially on recent releases of Android. By the way, you can do a factory reset remotely it's one of Google's features.

Re-lock and the phone won't boot up if it isn't bricked.
[LG G8 Guides, News, & Discussion] PHANX0M:
But does having it unlocked make it easier for someone to get unauthorized access into my handset and it's contents? What would they have to do to do that?

Would they be able to get in when bootloader's locked?
[LG G8 Guides, News, & Discussion] arksid:
how do i get into EDL mode while the phone is off?
[LG G8 Guides, News, & Discussion] arksid:
managed to enter EDL mode but i can't make the difference between the backed up files of abl, xbl, xbl_config and boot
[LG G8 Guides, News, & Discussion] arksid:
What happens if i just reflash the device with the steps you've provided in the beginning of this thread, will this problem be gone?
[LG G8 Guides, News, & Discussion] arksid:
Sorry for the many replies, i managed to restore the partitions files and the phone is up and running, thanks for the help, i'm at peace now, thank you again
[LG G8 Guides, News, & Discussion] netmsm:
Yes, it'd be easier.

I don't know, actually I don't have knowledge in this sort of things. As far as I remember, in older versions of Android it was possible to remove lock-screen pin or pattern through custom recovery. But now with improved security those hacks are not working. Maybe some new methods have been invented which I'm not aware of.

A locked bootloader guarantees security.
[LG G8 Guides, News, & Discussion] netmsm:
Great (y)
[LG G8 Guides, News, & Discussion] PHANX0M:
Gr8

Do those improved security patches go for Lineage OS too?

And when I flash Lineage OS to this ( https://www.getdroidtips.com/lineage-os-18-1-lg-g8-thinq/ )

Will there be anyway for me to install microG instead of GApps or I can't b/c Lineage OS doesn't support sigspoofing?
[LG G8 Guides, News, & Discussion] netmsm:
I do not have knowledge about custom Roms, sorry.
[LG G8 Guides, News, & Discussion] PHANX0M:
same... how do I edit the FTM to put the serial number? is there any use?
[LG G8 Guides, News, & Discussion] PHANX0M:
Bro, factory reset mode (the vol up +power then one LG logo's shown release power for one sec then press again) ain't working after crossflash! I need it for custom recoveries. Is there a way to fix this?

Also no updates ) :
[LG G8 Guides, News, & Discussion] McFlurry912:
Mate good day im one of you follower i have question about using qfil partition because i want to downgrade may v50s from a12 to a11 i already made your tutorial about opid mismatching but when i use qfil it show an error like this "switch to edl mode fail failed to switch to emeegency download mode" can you help me thanks
[LG G8 Guides, News, & Discussion] netmsm:
Restore original FTM.
[LG G8 Guides, News, & Discussion] netmsm:
Your phone is not detected by the computer. Make sure you're in EDL mode, drivers are installed and connection is correctly established.
[LG G8 Guides, News, & Discussion] McFlurry912:
its okay now mate thank you so much
[LG G8 Guides, News, & Discussion] PHANX0M:
Awesome thanks! I urge you to put that in the official guide post.

Now how to remove (or edit this)?
[LG G8 Guides, News, & Discussion] netmsm:
This is NT-Code error to solve which various methods have been discussed here; search for them in the thread. However, if you have no problem with network just ignore it.
[LG G8 Guides, News, & Discussion] PHANX0M:
Mine shows FFFFFF,84=/product/OP

And that only

Should I change it to the part YOU said and only have that? Mine's ATT to OPEN_US BTW.
[LG G8 Guides, News, & Discussion] dimex:
Hoping someone can help, no idea why this is happening. I have a US Unlocked G8X (G850QM). I simply want to upgrade to Android 12.

OTA portion of Android shows no update.

LG Bridge shows G850QM then downloads Android 12. Update starts then errors out at 0% "Your phone cannot update"

From there I installed LGUP and downloaded kdz from LG-Firmwares. That gives me the error saying I can't change models from T-Mo to Open.

The device works on T-Mo's network so I'm assuming it is an actual G850QM, but I may be wrong. Has anyone experienced this? I don't want to change models, I simply want the update. I have no idea if the seller could have done funny business and sold me am "unlocked" version when in fact he flashed a T-Mobile one.

Don't know much about LG devices, this is my first one.

Help, I'm going crazy!
[LG G8 Guides, News, & Discussion] AsItLies:
So it looks like you have t-mo on there now, and the kdz yer trying to go to is us_open. That would be crossflashing and you should follow everything at the beginning of this guide to do that.

But, yer not doing that because in LGUP you would then be doing 'partition download', not 'refurbish'.

If yer happy with the t-mo OS, then just find that kdz and use it instead of the US Open. If you want to go to us open, then follow what the directions on the first page of this guide.

good luck
[LG G8 Guides, News, & Discussion] dimex:
But it doesn't have a T-Mobile OS. It is the unlocked variant. It has standard LG boot screen, no carrier branding. Everywhere within the phone menus it says G850QM, LG Bridge and LGUP say it's G850QM. Only at the time of flashing when it errors out does it say it's a T-Mobile device.

But right next to the error it says the model number which is the unlocked variant. This doesn't make sense. Look at the last picture I posted, it says G850QM30b. That is Android 11 for the unlocked G8X that is currently on the device.

If it was a T-Mobile OS and seen as a T-Mobile device it should be reporting that within the model number as well....

Edit: T-Mobile didn't even release a G8X? People using G8X were using other unlocked variants
[LG G8 Guides, News, & Discussion] AsItLies:
No, see the QM variant, unlocked, can be sold by t-mo, with t-mo OS, just unlocked. It's confusing, clearly they could have done a better job organizing this. Search for lg firmware, you'll inevitably get UM listing. Go to the URL and change it to QM, then you'll see the variants for various carriers, it'll make more sense.
[LG G8 Guides, News, & Discussion] dimex:
I don't understand what you mean, can you repeat it again a little differently?

So what do you know, I went ahead and got QFIL going, followed the first guide. Installed the G850QM firmware and got Android 12 on the device. There was no prompt at the start of flashing within LGUP to ask if I wanted to change models.

Now the device is listed as LG_G850UM. Serial number disappeared and it is no longer considered the Unlocked variant. I know some other people had this exact issue, but I can't find a solution for it. Why did it not ask me to change the model number?

When I tried before it clearly gave me an error showing the Android 12 kdz as OPEN_US, but now it's T-Mo? Should I have left sid_a and sid_b partitions checked?

Edit: Like I said before, the KDZ I downloaded was G850QM40b_00_NAO_US_OP_0805.kdz, it is Android 12 for Unlocked Variant. There are no T-Mobile kdz for this phone. Just 2 versions with CCA or USA carrier codes: https://lg-firmwares.com/lg-lmg850qm-firmwares/
[LG G8 Guides, News, & Discussion] AsItLies:
Sorry I must have been confusing the G8 with another variant re the t-mo as a QM.

So the serial number is easily restored just by flashing your original FTM partition. Have to ask, why do you believe it's 'No longer considered the unlocked variant'? Just because it says UM and not QM? I wouldn't be concerned with that, to determine if it's unlocked, just put a sim in it from a different variant, if it works, it's not locked.

It not asking you to change the model number isn't unusual, this process, from the first page, isn't an 'official' process by LG, it may or may not ask you to change the variant, don't panic.

Just go to system setting and about phone, see what it tells you. Also, where it shows build number can be helpful info. Additionally, if you don't have and t-mo apps on the phone, then it's another indication it's the US open variant.
[LG G8 Guides, News, & Discussion] dimex:
I believe it because it used to show model number G850QM within about phone, within LG Bridge, within LGUP. It was populating as the unlocked variant everywhere.

Then once I went through the whole process, it changed to G850UM (not the unlocked variant), and now it's saying that model everywhere. I flashed the kdz which shows as being G850QM40b_00_NAO_US_OP_0805 in the filename, but within my device under every setting, within LG Bridge, and within LGUP it now says G850UM. Build number isn't returning any useful info.

I'm mostly just trying to figure out if it's actually a QM or UM model. I guess if everything works then who cares, but I paid extra money for the unlocked variant and that's also misrepresentation from the seller if it's simply cross-flashed and sold as one.

I don't have other SIMs to test. There are no carrier bloat apps on it.
[LG G8 Guides, News, & Discussion] dimex:
Very interesting, it is officially on Android 12 and back to correct model G850QM.

I couldn't find anyone here saying this is how they fixed it on their G8X, but this is solution., at least for me:

YOU HAVE TO RESTORE THE SERIAL NUMBER (FTM PARTITION) FOLLOWING THE GUIDE AND IT WILL RETURN YOUR DEVICE TO CORRECT MODEL.

Even though I flashed the unlocked Android 12 build, and even though it did not ask if I wanted to change the model to G850QM, following the guide it rids the device of the serial number and thus changes the model.

Follow the guide as outlined, then return to QFIL, delete just the FTM partition, and restore your original FTM partition. On next boot the serial number will be back and your model number will change.
[LG G8 Guides, News, & Discussion] AsItLies:
Good info, glad it worked for you. The FTM has been mentioned for other reasons, like getting serial number back and also, importantly, to be able to use the key combo to get to recovery and to fastboot. Never heard of it being used, the original, to get correct (now) model number.

Cheers
[LG G8 Guides, News, & Discussion] McFlurry912:
refer to this one mate it helps me a lot

Getting access to recovery combination(FTM mod)

* I'm not responsible for bricked devices, dead SD cards, thermonuclear war, or you getting fired because the alarm app failed (like it did for me...). * YOU are choosing to make these modifications, and if you point the finger at me for messing...

xdaforums.com
[LG G8 Guides, News, & Discussion] StvOchi:
Has anybody tried crossflashing a12 on the G8 non-korean variants?