Develop Bugs

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?

Problem with upgrading to 6.0

Hi guys
Recently i bought my girlfriend LG G4. Now I think it's from Singapore, and I totally have no idea, how to update it. I have 5.1 now, and of course I wanna 6.0. Using automatic option from smartphone still showing "up to date". LG bridge is finding some firmware, but after downloading, at 1% i got error. LG UP always saying, that's bad kdz file ( I download 4-5 of them). When i'm trying to check version by IMEI on devtester, I get nothing. I have no clue what could i do next .
imeipro.info/report.html?token=cae9ce52b6c7405da35d3d01e2cbe86b[/url]

Liian said:
Hi guys
Recently i bought my girlfriend LG G4. Now I think it's from Singapore, and I totally have no idea, how to update it. I have 5.1 now, and of course I wanna 6.0. Using automatic option from smartphone still showing "up to date". LG bridge is finding some firmware, but after downloading, at 1% i got error. LG UP always saying, that's bad kdz file ( I download 4-5 of them). When i'm trying to check version by IMEI on devtester, I get nothing. I have no clue what could i do next .
imeipro.info/report.html?token=cae9ce52b6c7405da35d3d01e2cbe86b[/url]
Click to expand...
Click to collapse
Go into Settings > About Phone > Software Version - at the bottom of the tab click on 'Software Version'. It should give you a version with 10(?) in it (last few numbers in the string). Find one with the same string with 20(?) for the same carrier. Use LGUP-NEW (https://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803) and click upgrade to set the 20(?) kdz file you found, then proceed to upgrade it.
Good Luck.

sdembiske said:
Go into Settings > About Phone > Software Version - at the bottom of the tab click on 'Software Version'. It should give you a version with 10(?) in it (last few numbers in the string). Find one with the same string with 20(?) for the same carrier. Use LGUP-NEW (https://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803) and click upgrade to set the 20(?) kdz file you found, then proceed to upgrade it.
Good Luck.
Click to expand...
Click to collapse
Well, I have h815 10b, so i download 20b, and still from lg up, lg bridge, to lg flash tool (which i think have right to not work with marshmallow) I always have an error.
like this:
http://imgur.com/a/GCJMg
Still, thanks for advice .

Liian said:
Well, I have h815 10b, so i download 20b, and still from lg up, lg bridge, to lg flash tool (which i think have right to not work with marshmallow) I always have an error.
like this:
http://imgur.com/a/GCJMg
Still, thanks for advice .
Click to expand...
Click to collapse
First - check the LGUP-NEW thread to see if others have posted similar problems and gotten any answers. If you don't find anything, post the issue there.
My suspicion is a carrier difference from the original but ...

sdembiske said:
First - check the LGUP-NEW thread to see if others have posted similar problems and gotten any answers. If you don't find anything, post the issue there.
My suspicion is a carrier difference from the original but ...
Click to expand...
Click to collapse
Okay, I'll check. Tell me only, because I'm not a native speaker in english, what do you mean by "carrier" in this context? And thank you for your interest - I was searching help in the biggest android forum in my country, and nobody was enough kind to respond .
Anyway, this is worst present I ever made to someone . First of all i was waiting 2 months for package, second problem with battery in theoretically brand new phone and now this soft issue. Well, I'll stay with Samsung s8 for myself than g6 .

Liian said:
Okay, I'll check. Tell me only, because I'm not a native speaker in english, what do you mean by "carrier" in this context? And thank you for your interest - I was searching help in the biggest android forum in my country, and nobody was enough kind to respond .
Anyway, this is worst present I ever made to someone . First of all i was waiting 2 months for package, second problem with battery in theoretically brand new phone and now this soft issue. Well, I'll stay with Samsung s8 for myself than g6 .
Click to expand...
Click to collapse
By carrier, I mean the wireless company that provides the phone/texting services to your phone ... if the phone wasn't bought from the original services company.
If it was, the other option might be to try a factory data reset to see if it allows the update to 6.0 to come through automatically - you will have to back all your data first, otherwise you will lose it.
PS: Don't forget to click the Thanks button ...

Well, I bough it from auction so it shouldn't be branded phone, but when i google it, i find information - buyer "EE". Quick look - provider from Great Britain? http://imeipro.info/report.html?token=cae9ce52b6c7405da35d3d01e2cbe86b

Liian said:
Well, I bough it from auction so it shouldn't be branded phone, but when i google it, i find information - buyer "EE". Quick look - provider from Great Britain? http://imeipro.info/report.html?token=cae9ce52b6c7405da35d3d01e2cbe86b
Click to expand...
Click to collapse
Refer to this link and see if the info provided helps solve your invalid kdz issue:
Link: https://www.mylgphones.com/how-to-solvefix-the-kdz-file-is-invalid-issue.html

sdembiske said:
go into settings > about phone > software version - at the bottom of the tab click on 'software version'. It should give you a version with 10(?) in it (last few numbers in the string). Find one with the same string with 20(?) for the same carrier. Use lgup-new (https://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803) and click upgrade to set the 20(?) kdz file you found, then proceed to upgrade it.
Good luck.
Click to expand...
Click to collapse
Why can't he use LG Flash Tool instead of LG UP ? It's more readily available.
---------- Post added at 11:52 AM ---------- Previous post was at 11:47 AM ----------
---------- Post added at 11:55 AM ---------- Previous post was at 11:52 AM ----------
sdembiske said:
By carrier, I mean the wireless company that provides the phone/texting services to your phone ... if the phone wasn't bought from the original services company.
If it was, the other option might be to try a factory data reset to see if it allows the update to 6.0 to come through automatically - you will have to back all your data first, otherwise you will lose it.
PS: Don't forget to click the Thanks button ...
Click to expand...
Click to collapse
Tell him to flash the H815 European firmware... it will not do any damage because the OS has the same signature across all variants, so the bootloader will accept.

sdembiske said:
Refer to this link and see if the info provided helps solve your invalid kdz issue:
Link: https://www.mylgphones.com/how-to-solvefix-the-kdz-file-is-invalid-issue.html
Click to expand...
Click to collapse
Thanks, I'll check it today evening. Hope it will work
BIG_BADASS said:
Why can't he use LG Flash Tool instead of LG UP ? It's more readily available.
---------- Post added at 11:52 AM ---------- Previous post was at 11:47 AM ----------
Also keep in mind, if you upgrade from 5.1... you can no longer root the device...
---------- Post added at 11:55 AM ---------- Previous post was at 11:52 AM ----------
Tell him to flash the H815 European firmware... it will not do any damage because the OS has the same signature across all variants, so the bootloader will accept.
Click to expand...
Click to collapse
Read somewhere that LG flash tool working only with 5.1, not 6.0. About version - except 20b, i have also european so if first will work, i'll next . I know that i can't root phone with 6.0 but first of all - it's for my girlfriend and i think, that she don't care. Second - with quite long history with android, i never rooted any of them. I never saw a reason and also i'm bit scared when we're talking about more complicated actions . Anyway, thanks for advice. We will in next 5 hours if i finally get 6.0 on this phone

Liian said:
Thanks, I'll check it today evening. Hope it will work
Read somewhere that LG flash tool working only with 5.1, not 6.0. About version - except 20b, i have also european so if first will work, i'll next . I know that i can't root phone with 6.0 but first of all - it's for my girlfriend and i think, that she don't care. Second - with quite long history with android, i never rooted any of them. I never saw a reason and also i'm bit scared when we're talking about more complicated actions . Anyway, thanks for advice. We will in next 5 hours if i finally get 6.0 on this phone
Click to expand...
Click to collapse
I recommend you root the device, then unlock the bootloader.
---------- Post added at 12:12 PM ---------- Previous post was at 12:10 PM ----------
Liian said:
Thanks, I'll check it today evening. Hope it will work
Read somewhere that LG flash tool working only with 5.1, not 6.0. About version - except 20b, i have also european so if first will work, i'll next . I know that i can't root phone with 6.0 but first of all - it's for my girlfriend and i think, that she don't care. Second - with quite long history with android, i never rooted any of them. I never saw a reason and also i'm bit scared when we're talking about more complicated actions . Anyway, thanks for advice. We will in next 5 hours if i finally get 6.0 on this phone
Click to expand...
Click to collapse
You're lucky you have the European version.. you have no idea how much hassle I went through to get that version...
So anyways, since your bootloader is unlockable, I recommend you unlock it first, prior to flashing anything mentioned by sdembiske.
I recommend you also root the phone and install TWRP, just incase something goes wrong while flashing, you can easily recover the phone, and not have it completely destroyed.
Once you have rooted, unlocked bootloader, and installed TWRP, you can safely do literally anything on the phone
Flashing the rom can easily make your 700USD device worth 0, within seconds... so Please .... take the precautions.... and install TWRP
Cheers
---------- Post added at 12:23 PM ---------- Previous post was at 12:12 PM ----------
Even some of the LG G4 variants with locked bootloaders are rootable...... your variant is DEFINITELY rootable

Liian said:
Thanks, I'll check it today evening. Hope it will work
Read somewhere that LG flash tool working only with 5.1, not 6.0. About version - except 20b, i have also european so if first will work, i'll next . I know that i can't root phone with 6.0 but first of all - it's for my girlfriend and i think, that she don't care. Second - with quite long history with android, i never rooted any of them. I never saw a reason and also i'm bit scared when we're talking about more complicated actions . Anyway, thanks for advice. We will in next 5 hours if i finally get 6.0 on this phone
Click to expand...
Click to collapse
LG Flash Tool has many more bricking issues than LGUP-NEW. If you ever decide you want to roll-back to 5.1, LGUP-NEW will throw up a roll-back version error if one is present - LG Flash Tool will not and will result in a bricked phone. Overall, your best and safest bet is to use LGUP-NEW.
One note: There are fraudulent sellers of supposed H815's out there and as you bought yours through auction there are no guarantees. To be on the safe side I would check with the seller to see if you can ascertain if he was the original owner and ask where the phone was purchased (what country) and who the original carrier was.

Well it didn't work. Anyway in download mode it show mi LG F500k. It's mean sth or it's normal name for g4

Liian said:
Well it didn't work. Anyway in download mode it show mi LG F500k. It's mean sth or it's normal name for g4
Click to expand...
Click to collapse
G4 F500k is the Korean version, isn't it??
https://forum.xda-developers.com/g4/help/korean-g4-f500k-t3150548
Before you do anything, be 100% sure what variant you have. To do so, please enter the following codes in the phone's dial pad:
*#546368#*815#
*#546368#*500#
If the first one works, you have the H815, if the second one works, you have the F500K ...
Report your findings,,,

Liian said:
Well it didn't work. Anyway in download mode it show mi LG F500k. It's mean sth or it's normal name for g4
Click to expand...
Click to collapse
Power down the phone, pull off the back cover and take out the battery. There should be a white tag under it - make a note of all the letters and numbers there. Provided the tag hasn't been tampered with, it should provide a good idea of what model you have and help narrow down your search for a kdz/tot that will work. I would still check with the seller of the phone and seek some verification. If the auction site is reputable, you may have some recourse if the phone is not as it was sold as.

sdembiske said:
Power down the phone, pull off the back cover and take out the battery. There should be a white tag under it - make a note of all the letters and numbers there. Provided the tag hasn't been tampered with, it should provide a good idea of what model you have and help narrow down your search for a kdz/tot that will work. I would still check with the seller of the phone and seek some verification. If the auction site is reputable, you may have some recourse if the phone is not as it was sold as.
Click to expand...
Click to collapse
The physical label is easier to tamper with, than the actual software. Just go by my suggestion.. the MMI codes.

Liian said:
Well it didn't work. Anyway in download mode it show mi LG F500k. It's mean sth or it's normal name for g4
Click to expand...
Click to collapse
The member providing you with the codes to access the hidden menu seems to have forgotten that not all codes work for the same models (as he himself found out when he tried once before) - there are carrier firmware variations with locks imposed on being able to access some. IMEI's can be changed by 'snakeheads, pimps' ... and fraudulent sellers.
Frankly, you are lucky you haven't bricked your phone completely by flashing different model/carrier variants and if you had used the LG Flash Tool to install the H815 kdz variant he recommended, you most likely would have. The same member has, for a fact, provided misleading, misinformed and potentially very harmful advice to other less informed members.

Frankly, you are lucky you haven't bricked your phone completely by flashing different model/carrier variants and if you had used the LG Flash Tool to install the H815 kdz variant he recommended, you most likely would have.
Click to expand...
Click to collapse
What do you mean "if you had used the LG Flash Tool to install the H815 kdz variant he recommended, YOU MOST LIKELY WOULD HAVE" ??
How do you know for sure?? Have you tried it??? NO you havn't tried it, so you have no right to say "it would most likely brick it".
---------- Post added at 05:30 AM ---------- Previous post was at 05:17 AM ----------
Liian said:
Well it didn't work. Anyway in download mode it show mi LG F500k. It's mean sth or it's normal name for g4
Click to expand...
Click to collapse
Hey buddy, let's check whether your bootloader is unlockable before you do anything. Please download ADB (Android Debug Bridge)
Before we do anything, make sure "Enable OEM Unlock" and "USB Debugging" options are enabled.
Once you install ADB, open Command Prompt (Press Windows Key + R , then type 'cmd' and press Enter key)
Issue the following commands:
Code:
cd C:\adb
Code:
adb start-server
Code:
adb devices
At this point, your device should show up under the list of devices. If it doesn't issue the following commands to restart the ADB server:
Code:
adb kill-server
Code:
adb start-server
Then, check again whether the device is being detected
Code:
adb devices
If the device is not showing, please check whether drivers are properly installed
If the device is being shown, you can proceed to the following command:
Code:
adb reboot-bootloader
If the device just boots back to Android, then the bootloader is locked, and you could have any device aside from the H811 or H815 European version
If it boots into the bootloader, then you have either the H811 or the H815 European version, and you should be able to easily root, install TWRP and flash any variants kdz file.
Now, if you have got this far without booting back to Android, time to unlock bootloader:
Code:
fastboot oem unlock
Once complete, issue:
Code:
fastboot getvar unlock
If you get the message "Unlock: Yes", then you have successfully unlocked bootloader.
Hope this helps

sdembiske said:
the member providing you with the codes to access the hidden menu seems to have forgotten that not all codes work for the same models (as he himself found out when he tried once before) - there are carrier firmware variations with locks imposed on being able to access some. Imei's can be changed by 'snakeheads, pimps' ... And fraudulent sellers.
Frankly, you are lucky you haven't bricked your phone completely by flashing different model/carrier variants and if you had used the lg flash tool to install the h815 kdz variant he recommended, you most likely would have. The same member has, for a fact, provided misleading, misinformed and potentially very harmful advice to other less informed members.
Click to expand...
Click to collapse
let him try the codes first ok...
If it doesn't work, then you complain... Otherwise you be quiet
You have no right to talk on his behalf and tell what works and what doesnt ok... let him try and see

LG G4 (H815) Android Upgrade

Hello guys,
I am using an unlocked H815 in India (bought from ebay) which is running software version Android Lollipop. The software update check always shows "You have latest updates installed".
Is there any way I can upgrade the OS without bricking the phone or causing simlock.
Sorry if this is an already posted query.
Please guide me.

you need to study it ....

rotoko said:
you need to study it ....
Click to expand...
Click to collapse
Study what?

[email protected] said:
Hello guys,
I am using an unlocked H815 in India (bought from ebay) which is running software version Android Lollipop. The software update check always shows "You have latest updates installed".
Is there any way I can upgrade the OS without bricking the phone or causing simlock.
Sorry if this is an already posted query.
Please guide me.
Click to expand...
Click to collapse
Can i get some help.
Still didnt find a solution. Stuck on Lollipop while the G4 world moved through Marshmallow to Nougat.

[email protected] said:
Hello guys,
I am using an unlocked H815 in India (bought from ebay) which is running software version Android Lollipop. The software update check always shows "You have latest updates installed".
Is there any way I can upgrade the OS without bricking the phone or causing simlock.
Sorry if this is an already posted query.
Please guide me.
Click to expand...
Click to collapse
have you tried LGUP to flash a rom to marshmallow?

okadamikki said:
have you tried LGUP to flash a rom to marshmallow?
Click to expand...
Click to collapse
Hi,
Sorry for very late reply. Never thought someone would care to help after such a long time.
I never tried LGUP because I cant find the right ROM for my device. Hardware info page shows H815 while on adb it shows up as LGF500L.....(last time I checked F500L is korean variant).
Also the device does not have recovery mode. When trying to boot into recovery a red exclamation comes up with "No command" written.

[email protected] said:
Hi,
Sorry for very late reply. Never thought someone would care to help after such a long time.
I never tried LGUP because I cant find the right ROM for my device. Hardware info page shows H815 while on adb it shows up as LGF500L.....(last time I checked F500L is korean variant).
Also the device does not have recovery mode. When trying to boot into recovery a red exclamation comes up with "No command" written.
Click to expand...
Click to collapse
Sounds like it might be a 'frankenphone' - the only way to fully ascertain what the phone model actually is, is to open it up and see what is printed on the motherboard. Refer to this link on how to tear it down: https://www.ifixit.com/Teardown/LG+G4+Teardown/42705
You can also then use SALT to ascertain what the GPT compatability is - that will tell you what roms are safe to flash in order to upgrade.

sdembiske said:
Sounds like it might be a 'frankenphone' - the only way to fully ascertain what the phone model actually is, is to open it up and see what is printed on the motherboard. Refer to this link on how to tear it down: https://www.ifixit.com/Teardown/LG+G4+Teardown/42705
You can also then use SALT to ascertain what the GPT compatability is - that will tell you what roms are safe to flash in order to upgrade.
Click to expand...
Click to collapse
Can I manually install recovery(twrp or something) and change to a custom rom from there?
Will that be possible.

[email protected] said:
Can I manually install recovery(twrp or something) and change to a custom rom from there?
Will that be possible.
Click to expand...
Click to collapse
tutorial: https://forum.xda-developers.com/g4/general/howto-complete-guide-to-unlock-twrp-t3370003
Can you just install cpuz and see is it fake?

NikBos said:
tutorial: https://forum.xda-developers.com/g4/general/howto-complete-guide-to-unlock-twrp-t3370003
Can you just install cpuz and see is it fake?
Click to expand...
Click to collapse
As per CPU-Z ( I have attached screenshot of the same)
Model : LG H815
Hardware : p1
Board : MSM8992

[email protected] said:
As per CPU-Z ( I have attached screenshot of the same)
Model : LG H815
Hardware : p1
Board : MSM8992
Click to expand...
Click to collapse
CPU-Z will not be reliable in the information it provides you as it only provides the information that has been installed on it. As I stated, the only way to truly ascertain is to strip it down and see what is printed on the motherboard - it is not difficult and there are no shortcuts to be 100% sure - if you don't do it the way I suggested, you run the risk of hard-bricking your phone when you flash something not meant for your phone. If you doubt me, check with steadfasterX, recognized developer who know this stuff inside-out ...
---------- Post added at 03:30 PM ---------- Previous post was at 03:27 PM ----------
[email protected] said:
Can I manually install recovery(twrp or something) and change to a custom rom from there?
Will that be possible.
Click to expand...
Click to collapse
If your bootloader is actually unlocked, you should be able to - you should use the latest 'preview' version for the rom version you are planning to flash. Refer to this link: https://forum.xda-developers.com/g4/development/recovery-twrp-3-touch-recovery-t3442424
Note: The Thanks button at the bottom right of this post, is there for a reason. It is an XDA courtesy to use it when members are answering your questions or trying to help solve your issues.

sdembiske said:
CPU-Z will not be reliable in the information it provides you as it only provides the information that has been installed on it. As I stated, the only way to truly ascertain is to strip it down and see what is printed on the motherboard - it is not difficult and there are no shortcuts to be 100% sure - if you don't do it the way I suggested, you run the risk of hard-bricking your phone when you flash something not meant for your phone. If you doubt me, check with steadfasterX, recognized developer who know this stuff inside-out ...
---------- Post added at 03:30 PM ---------- Previous post was at 03:27 PM ----------
If your bootloader is actually unlocked, you should be able to - you should use the latest 'preview' version for the rom version you are planning to flash. Refer to this link: https://forum.xda-developers.com/g4/development/recovery-twrp-3-touch-recovery-t3442424
Note: The Thanks button at the bottom right of this post, is there for a reason. It is an XDA courtesy to use it when members are answering your questions or trying to help solve your issues.
Click to expand...
Click to collapse
Ok. Will try if flashing twrp is possible.
I will post an update after that.

[email protected] said:
Ok. Will try if flashing twrp is possible.
I will post an update after that.
Click to expand...
Click to collapse
Flashing through fastboot is not possible.....phone wont get detected in fastboot mode.

[email protected] said:
Flashing through fastboot is not possible.....phone wont get detected in fastboot mode.
Click to expand...
Click to collapse
Can somebody give me a link for the right kdz for my phone.
Current installed software version : H81510h (So I hope flashing it might revive the phone).
Note : Quick reminder, this phone is unlocked and using in India.

[email protected] said:
Can somebody give me a link for the right kdz for my phone.
Current installed software version : H81510h (So I hope flashing it might revive the phone).
Note : Quick reminder, this phone is unlocked and using in India.
Click to expand...
Click to collapse
When you say 'unlocked' you are referring to carrier/sim unlocked I presume. If you were actually bootloader unlocked, you should be be able to flash TWRP in fastboot mode.
Look, I'll say it again, strip your phone down and find out exactly what is stamped on the motherboard. The last thing you want to do is try and flash a rom from a different model than you actually have.
Then look for a MM 1220x up to 1220z rom for the phone model you actually have and upgrade it with LGUP-NEW. Then proceed to unlock your bootloader. If it is actually an H815 European version you should be able to unlock it officially on LG's site. If it another H815 version etc., you will have to unlock it unofficially with steadfasterX's UsU method BUT you must be on MM to avoid issues when installing any custom roms from then on.
Don't take any shortcuts.

sdembiske said:
When you say 'unlocked' you are referring to carrier/sim unlocked I presume. If you were actually bootloader unlocked, you should be be able to flash TWRP in fastboot mode.
Look, I'll say it again, strip your phone down and find out exactly what is stamped on the motherboard. The last thing you want to do is try and flash a rom from a different model than you actually have.
Then look for a MM 1220x up to 1220z rom for the phone model you actually have and upgrade it with LGUP-NEW. Then proceed to unlock your bootloader. If it is actually an H815 European version you should be able to unlock it officially on LG's site. If it another H815 version etc., you will have to unlock it unofficially with steadfasterX's UsU method BUT you must be on MM to avoid issues when installing any custom roms from then on.
Don't take any shortcuts.
Click to expand...
Click to collapse
Opened up the phone and found that it is H815 after all.
So can somebody now guide me to which rom/kdz I should use.
[Currently on Lollipop..SW Version : H815 10h]

[email protected] said:
Opened up the phone and found that it is H815 after all.
So can somebody now guide me to which rom/kdz I should use.
[Currently on Lollipop..SW Version : H815 10h]
Click to expand...
Click to collapse
Here's a good site to download firmwares from: https://lg-firmwares.com/lg-h815-firmwares/firmwares/
Your looking for an H81520 with the latest alphabetical letter ... You'll have to decide on the one you want to try installing.

sdembiske said:
Here's a good site to download firmwares from: https://lg-firmwares.com/lg-h815-firmwares/firmwares/
Your looking for an H81520 with the latest alphabetical letter ... You'll have to decide on the one you want to try installing.
Click to expand...
Click to collapse
Thanks for the link.
So I may download kdz with H815 20 with latest alphabet (and no need to look particularly for H815 20h right).

[email protected] said:
Thanks for the link.
So I may download kdz with H815 20 with latest alphabet (and no need to look particularly for H815 20h right).
Click to expand...
Click to collapse
Correct. You will not find a 20h as the lower letters are used for previous android versions, higher letters for newer versions.
You are forgetting the 'Thanks' button at the bottom right of the posts - it's a good habit to get into ...

sdembiske said:
Correct. You will not find a 20h as the lower letters are used for previous android versions, higher letters for newer versions.
You are forgetting the 'Thanks' button at the bottom right of the posts - it's a good habit to get into ...
Click to expand...
Click to collapse
Oops..my bad. Thanked all the replies now.
Will update after flashing rom.

Stock rom for Hungarian variant?

Hello,
So i wanna go back from 8.1 aosp to stock rom, but i saw these different firmware versions people are talking about on this site like v10f,k,h or something and i don't get what they mean. If i install the firmware from here: https://forum.xda-developers.com/lg-g7-thinq/how-to/guide-how-to-flash-stock-firmware-lock-t3820888 , will it work? And is it the proper one? I had it installed once but only to get back from a bootloop, so I didn't really use it. Also, I checked on this website: https://www.mylgphones.com/lg-phones-software-update-hungary-download-lg-stock-kdz-firmware , i found the exact variant using my imei but there is no download link.

Clickau said:
Hello,
So i wanna go back from 8.1 aosp to stock rom, but i saw these different firmware versions people are talking about on this site like v10f,k,h or something and i don't get what they mean. If i install the firmware from here: https://forum.xda-developers.com/lg-g7-thinq/how-to/guide-how-to-flash-stock-firmware-lock-t3820888 , will it work? And is it the proper one? I had it installed once but only to get back from a bootloop, so I didn't really use it. Also, I checked on this website: https://www.mylgphones.com/lg-phones-software-update-hungary-download-lg-stock-kdz-firmware , i found the exact variant using my imei but there is no download link.
Click to expand...
Click to collapse
Hmmm...i would say don't rush unless you are sure.Maybe someone can help you.But in the past when i had sony (all sony categorie ) device u can flash any customized firmware version of countries of stock firmware as long you have UNLOCKED device.Not sure for lg.Please wait until someone guide you.Also please check link in this thread maybe it has what you need.(under kdz folder).

V10 b,f,k etc are system versions. Like program versions 1.2, 1.3, etc. There are 2 ways of going back to stock. You can use LG bridge to reinstall stock. Just reboot to download mode (reboot, USB , vol+). LG bridge should automatically detect the phone and allow you to update/go back to stock

LameMonster82 said:
V10 b,f,k etc are system versions. Like program versions 1.2, 1.3, etc. There are 2 ways of going back to stock. You can use LG bridge to reinstall stock. Just reboot to download mode (reboot, USB , vol+). LG bridge should automatically detect the phone and allow you to update/go back to stock
Click to expand...
Click to collapse
dev neo said:
Hmmm...i would say don't rush unless you are sure.Maybe someone can help you.But in the past when i had sony (all sony categorie ) device u can flash any customized firmware version of countries of stock firmware as long you have UNLOCKED device.Not sure for lg.Please wait until someone guide you.Also please check link in this thread maybe it has what you need.(under kdz folder).
Click to expand...
Click to collapse
Ok thank you, but i would like to make a full rom backup of the aosp i currently have installed. I don't think i can use twrp cause last time i flashed it, it bootlooped (even with the persistent version) and i had to reflash the boot img etc. I read about making a nandroid backup ( https://forum.xda-developers.com/showthread.php?t=1818321 ) with adb and dd but i would have to backup the entire memory and restore it and i would like not to mess with protected bootloader partitions for example. And i don't know exactly which partitions i want to backup with the method described above bcs there are partitions like recovery-persist and recovery-refresh and i don't know which are the right ones. Is there a way to do it?

Clickau said:
Hello,
So i wanna go back from 8.1 aosp to stock rom, but i saw these different firmware versions people are talking about on this site like v10f,k,h or something and i don't get what they mean. If i install the firmware from here: https://forum.xda-developers.com/lg-g7-thinq/how-to/guide-how-to-flash-stock-firmware-lock-t3820888 , will it work? And is it the proper one? I had it installed once but only to get back from a bootloop, so I didn't really use it. Also, I checked on this website: https://www.mylgphones.com/lg-phones-software-update-hungary-download-lg-stock-kdz-firmware , i found the exact variant using my imei but there is no download link.
Click to expand...
Click to collapse
use https://lg-firmware-rom.com/ to download the latest firmware for your phone with IMEI
---------- Post added at 01:39 AM ---------- Previous post was at 01:30 AM ----------

g710n updated to android 10 stuck in bootloop.

hi guys and thank you for a great forum.
Ive been trying to flash my phone from current pie 1kr korean to android 10 1kr stock rom from lg-firmwares and it get stuck on bootloop. ROM file used is "G710NOP30d_00_OPEN_KR_OP_0429.kdz"
I have tried other stock roms without luck.
only thing that works is rollback to Pie G710NOP20k_00_OPEN_KR_OP_1220.kdz
I am assuming my environment on win 10 is working as i can flash back to pie and phone boots correctly.
any idea what i should try next. ive been phone less for 2 days getting annoying. any help would be appreciated.
thanks in advance.

farshad77 said:
hi guys and thank you for a great forum.
Ive been trying to flash my phone from current pie 1kr korean to android 10 1kr stock rom from lg-firmwares and it get stuck on bootloop. ROM file used is "G710NOP30d_00_OPEN_KR_OP_0429.kdz"
I have tried other stock roms without luck.
only thing that works is rollback to Pie G710NOP20k_00_OPEN_KR_OP_1220.kdz
I am assuming my environment on win 10 is working as i can flash back to pie and phone boots correctly.
any idea what i should try next. ive been phone less for 2 days getting annoying. any help would be appreciated.
thanks in advance.
Click to expand...
Click to collapse
Try to crossflash using crossflash guide.
BTW why are you not getting this update officially through OTA?
---------- Post added at 01:39 PM ---------- Previous post was at 01:21 PM ----------
farshad77 said:
hi guys and thank you for a great forum.
Ive been trying to flash my phone from current pie 1kr korean to android 10 1kr stock rom from lg-firmwares and it get stuck on bootloop. ROM file used is "G710NOP30d_00_OPEN_KR_OP_0429.kdz"
I have tried other stock roms without luck.
only thing that works is rollback to Pie G710NOP20k_00_OPEN_KR_OP_1220.kdz
I am assuming my environment on win 10 is working as i can flash back to pie and phone boots correctly.
any idea what i should try next. ive been phone less for 2 days getting annoying. any help would be appreciated.
thanks in advance.
Click to expand...
Click to collapse
Also check if the kdz is downloaded properly. File size needs to be above 3gb.
Lg-firmwares is showing only 700mb file.

lefttobleed said:
Try to crossflash using crossflash guide.
BTW why are you not getting this update officially through OTA?
---------- Post added at 01:39 PM ---------- Previous post was at 01:21 PM ----------
Also check if the kdz is downloaded properly. File size needs to be above 3gb.
Lg-firmwares is showing only 700mb file.
Click to expand...
Click to collapse
I wish i did get it on OTA but this is a refurbished phone from aliexpress without serial number (S/N is on the back of the phone but not in OS). if you guys know how i can enable OTA on g710n in spain please do let me know.
file size is above 3gb and also lg up is not complaining as i know it does initial check before flashing.
I just cross flashed with this kdz file G710EM30b_00_OPEN_EU_OP_0707.kdz without any luck it still gets stuck on lg logo.

farshad77 said:
I wish i did get it on OTA but this is a refurbished phone from aliexpress without serial number (S/N is on the back of the phone but not in OS). if you guys know how i can enable OTA on g710n in spain please do let me know.
file size is above 3gb and also lg up is not complaining as i know it does initial check before flashing.
I just cross flashed with this kdz file G710EM30b_00_OPEN_EU_OP_0707.kdz without any luck it still gets stuck on lg logo.
Click to expand...
Click to collapse
There is a thread in guides section called android 10 for g710. Maybe you can try their methods there or ask them for help as they have the same model as you.

lefttobleed said:
There is a thread in guides section called android 10 for g710. Maybe you can try their methods there or ask them for help as they have the same model as you.
Click to expand...
Click to collapse
hello again i have now twice tried to crossflash with lgup dev
lgup_cmd.exe com4 "C:\Program Files (x86)\LG Electronics\LGUP\model\common\LGUP_Common.dll" "C:\Users\Saddat\Downloads\G710EM30b_00_OPEN_EU_OP_0707.kdz"
and it still gets stuck on boot loop with lg log stuck.
can it be the missing serial number? should i find a way to add the serial number i have on the back of the phone into the phone?¿ im out of idea....