Develop Bugs

[Q] Secure Booting Error

Hello!
I have just rooted my G3, and I thought I'd also flash custom recovery and unlock bootloader with Bump. However when I did that, and phone attempted to reboot, it doesn't boot and says "secure booting error". I know there had been many questions around this topic, but non had helped me. What is the easiest way to "undo" this? Unbricking? Unrooting?
Thanks for patience and help!

The easiest way is to use the kdz tool, you can follow this tutorial here: http://forum.xda-developers.com/showthread.php?t=2785089

RapHaeL_4_4_4_ said:
The easiest way is to use the kdz tool, you can follow this tutorial here: http://forum.xda-developers.com/showthread.php?t=2785089
Click to expand...
Click to collapse
but how do I know which stock image and DLL file to download? I have D855 and running lollipop. I'm not sure what to download.
And also, what does TOT stand for?

KristjanBerce said:
but how do I know which stock image and DLL file to download? I have D855 and running lollipop. I'm not sure what to download.
And also, what does TOT stand for?
Click to expand...
Click to collapse
I don't know what does TOT stand for and personally I use the kds method, I think its the easiest.
You can download KDZ from here: http://storagecow.eu/index.php?dir=Xda/LG+G3/Stock/
Kdz for the D855 on lollipop here: http://storagecow.eu/index.php?dir=Xda/LG+G3/Stock/Lollipop+5.0/D855/
And just to let you know, bump only work on kitkat, so if you want to use bump you need to downgrade to kitkat before using it, otherwise you get this error

RapHaeL_4_4_4_ said:
I don't know what does TOT stand for and personally I use the kds method, I think its the easiest.
And just to let you know, bump only work on kitkat, so if you want to use bump you need to downgrade to kitkat before using it, otherwise you get this error
Click to expand...
Click to collapse
ok thank you.
I have another kida stupid question but how do I know which link to download? I mean I know its 855, but I am not sure about the letters afer that.. Is there any way to find it, since I cant turn my phone on?

KristjanBerce said:
ok thank you.
I have another kida stupid question but how do I know which link to download? I mean I know its 855, but I am not sure about the letters afer that.. Is there any way to find it, since I cant turn my phone on?
Click to expand...
Click to collapse
The letter after is the OS version, so for example if you watch the D855 lollipop folder you have:
D85519C
D85519H
D85520A
D85520H <-- This is the most recent
The higher the number and letter is, the newest the software is.
And if the name start with D855***, your device is compatible.
Hope this help, if you have any other question, don't hesitate

RapHaeL_4_4_4_ said:
The letter after is the OS version, so for example if you watch the D855 lollipop folder you have:
D85519C
D85519H
D85520A
D85520H <-- This is the most recent
The higher the number and letter is, the newest the software is.
And if the name start with D855***, your device is compatible.
Hope this help, if you have any other question, don't hesitate
Click to expand...
Click to collapse
thank you sooo much! I will try as soon kdz will download. meanwhile, what exactly does this do?

KristjanBerce said:
thank you sooo much! I will try as soon kdz will download. meanwhile, what exactly does this do?
Click to expand...
Click to collapse
It reset your phone, reinstall everything on it (Bootloader, OS, recovery, etc..)

Downgrade from MM to LL with LGUP is possible!

Just wanted everybody to know that you CAN downgrade your MM LG G4 for Verizon by using LGUP.
And this is how...
1). Download all The Files Below!
1) Firmware Files - Click HERE!
Or Here LGKDZ.com for your exact match KDZ for your model
2) Download LG Drivers - LG Drivers Here - 10.9 Mb
2.1)Verizon Drivers (Verizon Only)LG_VZW - 7.8 Mb
3..LGUP can be found on this website LG UP DOWNOAD
You have to sign into one of your accounts and like the page for them to open the downloads in the middle of the page.
4. install the drivers then the .msi file for LGUP. Usually there is a DLL file and the LGUP application, install the .DLL file then install LGUP.
5. First make sure that your phone is showing up on LGUP, if not make sure you have USB debugging enabled and the you are connected with MTP.
6. Find your .kdz file, and don't press start VERY IMPORTANT!!, Exit out of the application and then REOPEN LGUP and your 13b.KDZ should still be in the box at the bottom.
7. Now just press start and wait for it to do it's magic.
And now your back on LL and you can get back to rooting this phone.
And just so people know it is not possible to downgrade from LL to KK, it will brick your phone for some reason, and trust me I had to send mine back and get a knew one, nothing would get it to work again!
So that's how you get back to LL from MM, which seems to be the only way to have root at the moment...
One more thing, I was able to transfer the files for the effortless root on MM but you can't do any send_command.exe commands because it just says FAIL. but it did switch the system software from Official to Modified so it did something just not what I wanted it to do....

If there's anyone wondering why this works, it's because both the 13b and 24c kdz's both have the same qfuse number, so the bootloader accepts both without bricking. If Verizon ever puts out an update that increments the qfuse value and you take it, you won't be able to downgrade to 13b or 24c.

I have the kdz file but it wont let me put it on lgup. It's looking for a .tot file. Help would be greatly appreciated
Nevermind. Figured it out

would this work with h811

mrewn said:
would this work with h811
Click to expand...
Click to collapse
This is the Verizon VS986 LG G4 section .

shoes22 said:
If there's anyone wondering why this works, it's because both the 13b and 24c kdz's both have the same qfuse number, so the bootloader accepts both without bricking. If Verizon ever puts out an update that increments the qfuse value and you take it, you won't be able to downgrade to 13b or 24c.
Click to expand...
Click to collapse
Thank you for the info! Just curious: how do you check the value of qfuse?

I did this on a Canadian variant H812 and it worked. Rooted right after and that worked too. I am a happy camper.
I loaded H81210n.
Anyone reading do note that I did not use the Verizon files above.
---------- Post added at 06:39 PM ---------- Previous post was at 06:34 PM ----------
duvelsuper said:
I have the kdz file but it wont let me put it on lgup. It's looking for a .tot file. Help would be greatly appreciated
Nevermind. Figured it out
Click to expand...
Click to collapse
What you must do is tick the update and select the kdz file. Then close LGUP, open it again and select refurbish and kdz file should be there. Start the load.
This phone with L and root is perfect. No M for me until root (if it happens). Really enjoy having the changed DPI with root and no permanent notification for Priority mode.

You can DL from here, without "liking" anything. http://www.droidopinions.com/download-lgup-tool/

Colchiro said:
You can DL from here, without "liking" anything. http://www.droidopinions.com/download-lgup-tool/
Click to expand...
Click to collapse
Or get it from this XDA thread: http://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803 where those other sites probably got it from .

divineBliss said:
Or get it from this XDA thread: http://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803 where those other sites probably got it from .
Click to expand...
Click to collapse
*edit* sorry did not mean to quote the person above me. I'm asking about actually getting from MM back to LP
Hate to ask this but has anyone verified this? I'm wanting to do this to mine tonight but I don't have near the experience a lot of others do here.

I did this without any problems at all
phonepie said:
*edit* sorry did not mean to quote the person above me. I'm asking about actually getting from MM back to LP
Hate to ask this but has anyone verified this? I'm wanting to do this to mine tonight but I don't have near the experience a lot of others do here.
Click to expand...
Click to collapse
I did this without any problems at all

It's very easy. Just load stock kdz with LGUP. I even rooted and all that after.
Sent from my LG-H812 using Tapatalk

tulio25 said:
I did this without any problems at all
Click to expand...
Click to collapse
thanks!
---------- Post added at 12:21 AM ---------- Previous post was at 12:20 AM ----------
milan187 said:
It's very easy. Just load stock kdz with LGUP. I even rooted and all that after.
Sent from my LG-H812 using Tapatalk
Click to expand...
Click to collapse
thanks!

silly question but will i lose all data on my phone if I do this?

stephen293 said:
silly question but will i lose all data on my phone if I do this?
Click to expand...
Click to collapse
I haven't done it just yet. And I know I'm not the smartest here. But to my knowledge yes you will lose everything. So always good to back up all your files. I've got all my photos backed up to google photos. over 5000 lol. But yeah from what I understand it's the same as doing a factory reset except instead of factory resetting back to MM you're factory resetting to LP.

stephen293 said:
silly question but will i lose all data on my phone if I do this?
Click to expand...
Click to collapse
(Request to a moderator below my response to stephen293)
OK, I did mine last night and using the refurbish mode as said does in fact delete all data.
((TO MODERATOR CAN WE GET THE ORIGINAL POST UPDATED TO INCLUDE THAT TO LOCATE THE KDZ FILE YOU NEED TO FIRST TICK THE UPGRADE CIRCLE)) I found it down the thread, But just figured it would be easier for others if it was included in the original post. Thanks

Big ups to everyone who made this happen!

Link not working kdz site down
Azweezey said:
Just wanted everybody to know that you CAN downgrade your MM LG G4 for Verizon by using LGUP.
And this is how...
1). Download all The Files Below!
1) Firmware Files - Click HERE!
Or Here LGKDZ.com for your exact match KDZ for your model
2) Download LG Drivers - LG Drivers Here - 10.9 Mb
2.1)Verizon Drivers (Verizon Only)LG_VZW - 7.8 Mb
3..LGUP can be found on this website LG UP DOWNOAD
You have to sign into one of your accounts and like the page for them to open the downloads in the middle of the page.
4. install the drivers then the .msi file for LGUP. Usually there is a DLL file and the LGUP application, install the .DLL file then install LGUP.
5. First make sure that your phone is showing up on LGUP, if not make sure you have USB debugging enabled and the you are connected with MTP.
6. Find your .kdz file, and don't press start VERY IMPORTANT!!, Exit out of the application and then REOPEN LGUP and your 13b.KDZ should still be in the box at the bottom.
7. Now just press start and wait for it to do it's magic.
And now your back on LL and you can get back to rooting this phone.
And just so people know it is not possible to downgrade from LL to KK, it will brick your phone for some reason, and trust me I had to send mine back and get a knew one, nothing would get it to work again!
So that's how you get back to LL from MM, which seems to be the only way to have root at the moment...
One more thing, I was able to transfer the files for the effortless root on MM but you can't do any send_command.exe commands because it just says FAIL. but it did switch the system software from Official to Modified so it did something just not what I wanted it to do....
Click to expand...
Click to collapse
Hey sorry but the www.lgkdz.com doesn't work. Is there another site we can find all lg firmware to downgrade for our exact lg variant match....

From OP second 1), try : http://storagecow.eu/index.php?dir=Xda/LG+G4/
or check the XDA G4 section for your variant.

Thank you for your response. I did actually download the H812 kdz from storagecow however when I put it in the LGUP tool it read as an error in the tot file. I'm not sure what happened or where I went wrong. I'm so confused at this point and without my G4 being unuseable at this time. I also wanted to ask if the kdz you directed me to are in fact the file I need to go back to LP from MM?

NEED TOT file and .dll H811

can anyone share me the TOT file for LG G4 H811. i searched the entire internet and i cant find it.
Thanks

themaskofwraith said:
can anyone share me the TOT file for LG G4 H811. i searched the entire internet and i cant find it.
Thanks
Click to expand...
Click to collapse
what for,?

I rooted ny phone and changed build.props model name. And now i can't boot.

raptorddd said:
what for,?
Click to expand...
Click to collapse
hi canu pls share tot file. thanks

themaskofwraith said:
hi canu pls share tot file. thanks
Click to expand...
Click to collapse
therrs no tot file . only kdz

Can you use ADB / Fastboot? Do you have USB debugging enabled on your phone? Maybe you can pull the build.prop file, modify it and then push it back.

themaskofwraith said:
hi canu pls share tot file. thanks
Click to expand...
Click to collapse
can you enter download mode.??
press vol up then connect usb cable if yes.. then download your phone variant KDZ and flash it using LGUP program to go back to stock firmware and fix if not booting.

raptorddd said:
can you enter download mode.??
press vol up then connect usb cable if yes.. then download your phone variant KDZ and flash it using LGUP program to go back to stock firmware and fix if not booting.
Click to expand...
Click to collapse
LG UP doesnt recognize the device and says unknown model. bcz i changed model name in buildprops. And i cant change it back bcz i cant boot and stuck on LG Logo. Thats is the reason i wanna try tot file method

themaskofwraith said:
LG UP doesnt recognize the device and says unknown model. bcz i changed model name in buildprops. And i cant change it back bcz i cant boot and stuck on LG Logo. Thats is the reason i wanna try tot file method
Click to expand...
Click to collapse
as far as i know ther isnt any TOT.

He can't use LGUP because the model name is changed in build.prop.

raptorddd said:
as far as i know ther isnt any TOT.
Click to expand...
Click to collapse
Never thought u can brick a device by changing model name. Do u have any idea on how can i get this device to work .

themaskofwraith said:
Never thought u can brick a device by changing model name. Do u have any idea on how can i get this device to work .
Click to expand...
Click to collapse
not sure. i know ive seen post just like yours . that edited build.prop and phone no longer worked.. maybe do a search and try to read and see if they did found a solution for it.. sorry good luck.

raptorddd said:
not sure. i know ive seen post just like yours . that edited build.prop and phone no longer worked.. maybe do a search and try to read and see if they did found a solution for it.. sorry good luck.
Click to expand...
Click to collapse
Thanks i searched the internet i dont think there is a fix. need to take it to the LG Store i guess. i have Never seen a android phone that doesnt let you get into fastboot until LG G4.

themaskofwraith said:
Thanks i searched the internet i dont think there is a fix. need to take it to the LG Store i guess. i have Never seen a android phone that doesnt let you get into fastboot until LG G4.
Click to expand...
Click to collapse
search herei n the lg g4 forum.

LGUP TOT
my problem is that LGUP only reads TOT files so my KDZs don't work. I also have the LG h811 build.

DellyBoi18 said:
my problem is that LGUP only reads TOT files so my KDZs don't work. I also have the LG h811 build.
Click to expand...
Click to collapse
you got it the wrong way.. LGUP uses KDZ only.. you need to uncompress kdz zip file.. the open LGUP. select upgrade then on lower bar browse file .. close LGUP open it up and select refurbished and start...:good:

raptorddd said:
you got it the wrong way.. LGUP uses KDZ only.. you need to uncompress kdz zip file.. the open LGUP. select upgrade then on lower bar browse file .. close LGUP open it up and select refurbished and start...:good:
Click to expand...
Click to collapse
I always uncompress rar/zip files unless otherwise instructed. LGUP only seeks for TOT files in my experience unless I am using the wrong version or something

DellyBoi18 said:
I always uncompress rar/zip files unless otherwise instructed. LGUP only seeks for TOT files in my experience unless I am using the wrong version or something
Click to expand...
Click to collapse
as far as i know inky KDZ and flashtools uses TOT.
heres is
https://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803

raptorddd said:
as far as i know inky KDZ and flashtools uses TOT.
heres is
https://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803
Click to expand...
Click to collapse
I figured it out. I typed * in the "File Name:" text box and pressed enter and everything showed.

2AA is rolling out!

2AA is rolling out, mine updated on the 18th from 29A.
Not much info about the update,
"Software Version: VS9862AA
The current software update gives you the most up to date Android™ security patch on your device."
form Verizon site.

Lame... Where's 7.0 or even better... 7.1?!

Force an update?
My phone is still on 24C is there a way I can force an update?

eltea said:
My phone is still on 24C is there a way I can force an update?
Click to expand...
Click to collapse
Mine got the update but after two days back on 5.1. Battery Life was awful

Anyone got a KDZ yet? Got a phone that locked on boot a day after the update. Standard fixes didn't work and can't use previous KDZ as it stops at 5% or 6%

Would also like to know if anyone has successfully downgraded from 2AA and if they can provide a KDZ.

Did you use LGUP to get back to 13B from the new 2AA using the 13B KDZ file for Vs986?
WAIDroid said:
Mine got the update but after two days back on 5.1. Battery Life was awful
Click to expand...
Click to collapse
---------- Post added at 11:40 PM ---------- Previous post was at 11:34 PM ----------
I have used the 13B VS986 KDZ file in the past to downgrade to 13B. Is that file not working for people now to downgrade from 2AA back to 13B (aside from the one person in a bootloop).
LudicrousPeed said:
Would also like to know if anyone has successfully downgraded from 2AA and if they can provide a KDZ.
Click to expand...
Click to collapse

divineBliss said:
Did you use LGUP to get back to 13B from the new 2AA using the 13B KDZ file for Vs986?
Click to expand...
Click to collapse
Yep but i had trouble as it would close while trying to downgrade but with my searching i looked at THIS and the .DLL File fixed my issue.

Awesome! This should help a lot of people.
WAIDroid said:
Yep but i had trouble as it would close while trying to downgrade but with my searching i looked at THIS and the .DLL File fixed my issue.
Click to expand...
Click to collapse

If the File ever needs to be re-uploaded let me know
Edit: Just Uploaded anyways so have fun (The .DLL is NOT A Virus!)
LINK

I posted a link to your fix in https://forum.xda-developers.com/ve...to-ll-lgup-t3322616/post72034093#post72034093
Maybe you want post more details there or watch that thread.
WAIDroid said:
If the File ever needs to be re-uploaded let me know
Click to expand...
Click to collapse

WAIDroid said:
Yep but i had trouble as it would close while trying to downgrade but with my searching i looked at THIS and the .DLL File fixed my issue.
Click to expand...
Click to collapse
Excellent. Lifesaver!
Confirmed working. Downgraded from the dreaded 2AA to 13B using LGUP. Before using LGUP though, I placed the new .DLL file in the correct folder as shown here (DLL link available in video description) https://www.youtube.com/watch?v=w4RSEholcuM then followed the instructions here (make sure to follow as step #6 says, and exit out of LGUP then reopen before starting) https://forum.xda-developers.com/verizon-g4/general/downgrade-mm-to-ll-lgup-t3322616

upgrade from 29A to 2AA, no much difference that I noticed.

much thanks.I just got a g4 used today and it was upgraded to 2AA but this downgrade saved me

WAIDroid said:
If the File ever needs to be re-uploaded let me know
Edit: Just Uploaded anyways so have fun (The .DLL is NOT A Virus!)
LINK
Click to expand...
Click to collapse
Thanks very much to WAIDroid for the new .dll file. It was hanging up on the downgrade from 2AA, but that fixed it!

Help please unlocking GSM radios on LG G4 with VS9862AA
Hello, a family member received their phone back from LG with a replaced motherboard due to the boot loop issue. We got it back with the VS9862AA software version (Build Number MRA58K).
Can anyone one point me to instructions on what to do to get the GSM radios unlocked so they can use the phone on AT&T or T-Mobile? I remember doing the install to 6.0 Marshmallow maybe a year or more ago when it wasn't available yet officially, and that one had the unlocked bootloader and GSM radios unlocked. So I'm somewhat familiar with the process, I just need to go back and revisit my notes I made about the ordeal.
Has there been any improvements to make this process easier if we just want the GSM radios unlocked? Any help would be very, very appreciated. Thanks in advance!!

LudicrousPeed said:
Excellent. Lifesaver!
Confirmed working. Downgraded from the dreaded 2AA to 13B using LGUP. Before using LGUP though, I placed the new .DLL file in the correct folder as shown here (DLL link available in video description) https://www.youtube.com/watch?v=w4RSEholcuM then followed the instructions here (make sure to follow as step #6 says, and exit out of LGUP then reopen before starting) https://forum.xda-developers.com/verizon-g4/general/downgrade-mm-to-ll-lgup-t3322616
Click to expand...
Click to collapse
I am having this problem now, but youtube says this video is no longer available. What do I need to do with this dll?
Edit: Ok, so I searched my pc for LGUP_8994 and found a dll file of the same name in C:\Program Files (x86)\LG Electronics\LGUP\model\8994 so I replaced that file with the one found in this thread. Now all is well, and I have successfully downgraded from 2ba!

Can someone give me a link for the dll file for the 2ba update. I tried with the YouTube video but it's no longer available and can't find it anywhere. Please and thank you

Should be towards the end of this thread.
https://forum.xda-developers.com/verizon-g4/general/downgrade-mm-to-ll-lgup-t3322616
Just go here instead....
https://forum.xda-developers.com/showpost.php?p=72034262&postcount=10
Don't forget to hit the thanks button
mofeck said:
Can someone give me a link for the dll file for the 2ba update. I tried with the YouTube video but it's no longer available and can't find it anywhere. Please and thank you
Click to expand...
Click to collapse

EDIT: Never mind, i got it now.
Why the LgUp asks me for a tot file and not kdz? Did i got a wrong version of lgup? Or im doing it wrong? I'm new to LG any help wold be apreciatte it. Thanks

LGUP Oreo DLL File for V30

I had this issue last night so thought id save people some trouble and share the the file needed incase you need to flash over 20D's KDZ file either to go back or forward.
Please unzip and put in C:\Program Files (x86)\LG Electronics\LGUP\model\common
Works with LGUP 1.14

Whiskeyomega said:
I had this issue last night so thought id save people some trouble and share the the file needed incase you need to flash over 20D's KDZ file either to go back or forward.
Please unzip and put in C:\Program Files (x86)\LG Electronics\LGUP\model\common
Works with LGUP 1.4
Click to expand...
Click to collapse
Do you happen to have a link to LGUP 1.4? I can only find 1.14.3.
Thanks

Interesting. Looks like they updated the KDZ format again.
*Sigh*
-- Brian

dvgb173 said:
Do you happen to have a link to LGUP 1.4? I can only find 1.14.3.
Thanks
Click to expand...
Click to collapse
sorry i meant 1.14 just missed a 1 out.

dvgb173 said:
Do you happen to have a link to LGUP 1.4? I can only find 1.14.3.
Thanks
Click to expand...
Click to collapse
1.14 is the latest. I found some other typos in other LG threads also calling it "1.4".
Sent via open market LG US998 V30/V30+

Damn.
I had it working with 1.14, but I thought I had the wrong version. So I uninstalled it.
Now I can't get it to load - wrong dll for VS99620a.
Plus I wanted the developer version of LGUP.
Pretty sure I need the Partition option to flash other-model KDZ.

Hi there,
I need some help because i fell so stupid.... I cannot use the patched DLL for uppercut in order to flash the newest Oreo KDZ for H930...
I installed LGUP 1.14, USB DRiervs, etc... Download and uncompress uppercut 1.0.0.0. I downloaded the patched DLL 1.0.31.9. Even if I copy that dll on the uppercut folder or wherever i copy, the version shown on LGUP is always the 1.0.28.9... SO I cannot flash the latest Oreo KDZ
Help please?
thx in advance

you have to run lgup.exe not uppercut shortcut.

Dizzyrul3z said:
you have to run lgup.exe not uppercut shortcut.
Click to expand...
Click to collapse
****...!!! You're right...
I didn't create the common folder. I thought yes, but no...
Thx a lot!!!!

wont let me create common folder after created disapears

suckme69 said:
wont let me create common folder after created disapears
Click to expand...
Click to collapse
Check permissions. It was my previous fault

kherio said:
Check permissions. It was my previous fault
Click to expand...
Click to collapse
My bad my folders in setting was hidden

Hi, has anyone been able to revert back to N from O, please? I upgraded my H930DS (Hong Kong) to the Open Euro 20d ROM, but haven't been able to go back to N using either the patched LGUP or UPPERCUT (… I'm not happy with the limitation on the use of the dual SIM). With the phone in download mode, the error I get is "DLL for H93020d is invalid. Please install valid DLL package(*.msi) for the model". I get the same message if I try both methods with the phone in its normal operating mode. Thanks for any help.

peterjcar said:
Hi, has anyone been able to revert back to N from O, please?
Click to expand...
Click to collapse
Yes. I saw a report yesterday of someone who had downgraded. Just flash the KDZ:
autoprime said:
to downgrade just use the new oreo lgup_common.dll and you should be able to flash previous N KDZs again in LGUP.
Click to expand...
Click to collapse

peterjcar said:
Hi, has anyone been able to revert back to N from O, please? I upgraded my H930DS (Hong Kong) to the Open Euro 20d ROM, but haven't been able to go back to N using either the patched LGUP or UPPERCUT (… I'm not happy with the limitation on the use of the dual SIM). With the phone in download mode, the error I get is "DLL for H93020d is invalid. Please install valid DLL package(*.msi) for the model". I get the same message if I try both methods with the phone in its normal operating mode. Thanks for any help.
Click to expand...
Click to collapse
hi, I am using H930DS (Hong Kong) too.
Could you please tell me how flash the Open Euro 20d ROM?
Thanks!!!

kimball said:
hi, I am using H930DS (Hong Kong) too.
Could you please tell me how flash the Open Euro 20d ROM?
Thanks!!!
Click to expand...
Click to collapse
ROM or the KDZ? You probably mean the stock open European KDZ.
For the KDZ, go to the thread. Instructions are there.
https://forum.xda-developers.com/showthread.php?t=3779076
Sent via open market LG US998 V30/V30+

ChazzMatt said:
Yes. I saw a report yesterday of someone who had downgraded. Just flash the KDZ:
Click to expand...
Click to collapse
Thanks, but I think the operative word in that quote is "should". I've tried that method with the phone in download mode and with it in its normal operating mode, but LGUP no longer recognises my phone model. I can get the LGUP pop-up with the serial port but the pop-up shows the phone as an unknown model, which I guess is the issue preventing the firmware update.
The version of LGUP_common.dll that I'm using is 1.0.35.3, which should be the latest. Its digital signature is dated ‎Tuesday, ‎19 ‎December ‎2017 3:33:29 PM. Its MD5# is c3df15812c1294028bfd330eb725519b.

i doesn't work for me on my ls998 v30+ sprint. do i need to make new folder (common) in the model folder? i tried with and without...

Looks like there's no going back...
peterjcar said:
Thanks, but I think the operative word in that quote is "should". I've tried that method with the phone in download mode and with it in its normal operating mode, but LGUP no longer recognises my phone model. I can get the LGUP pop-up with the serial port but the pop-up shows the phone as an unknown model, which I guess is the issue preventing the firmware update.
The version of LGUP_common.dll that I'm using is 1.0.35.3, which should be the latest. Its digital signature is dated ‎Tuesday, ‎19 ‎December ‎2017 3:33:29 PM. Its MD5# is c3df15812c1294028bfd330eb725519b.
Click to expand...
Click to collapse
Here is the reply I received from LG about reverting to Nougat (I asked them to do it for a fee):
"Dear Peter,
Thank you for contacting LG Customer Support. I apologise, but please be advised that we cannot put back your the previous software of your phone.
We suggest that you perform Factory Reset to your phone. This will not restore its previous software, but can fix issues of your phone. However, this will delete everything saved in your phone memory. You may back up first your files.
To reset:
Go to Settings
Select Backup & Reset
Select Factory Data Reset
If the issue will still continue, please let us know so we can assist you further.
Thank you. Have a great day ahead.
If you have any further questions or concerns, you can click on the link below to respond via email.
To help improve our Quality of Service, w e would appreciate it if you could complete our Customer Service Survey using the Survey link below.
Yours Sincerely,
Allen B.
Customer Care Representative
LG Electronics Australia & New Zealand"
… However, I was able to flash my LGH930DS to Oreo for the LGH930DS using LG Bridge after a few attempts (I couldn't get UPPERCUT to revert my phone to Nougat), resolving my issue with using the dual-SIM with the cross-flashed firmware and thus obviating my need to revert to Nougat.

Looking for some guidance please & thanks.
I have a H933, converted using the Frankenstein method to a US998. Then Unlocked BL, TWRP and rooted. Upgraded to US99820d
I would now like to flash back to stock H933. I have installed the Patched version of LGUP. I have extracted the DLL here into a common folder inside the model folder. I put the phone in Download mode, plug it in and then launch LGUP (patched). it finds the device but then errors saying the DLL is not valid for US98820d and to get a compatible DLL.