Develop Bugs

[Q] [Help] Downgrading from Lollipop to KitKat

http://forum.xda-developers.com/showthread.php?t=2785089
I've read this post like 100 times now, and i still don't know what to do.
http://storagecow.eu/index.php?dir=Xda%2FLG+G3%2FStock%2F
I know my model is D855, but there are a lot of versions with the same name, i'm not sure which one is the right for me.
I'm running 5.0 Lollipop on my G3 and wanting to downgrade back to Kitkat for root. (I don't even know why i updated to Lollipop in the first place).
Also i need to download the correct software version that i need to downgrade to (ie. KitKat), but i cannot tell the difference.
Any Help would be greatly appreciated, Thanks!

BarCouSeH said:
http://forum.xda-developers.com/showthread.php?t=2785089
I've read this post like 100 times now, and i still don't know what to do.
http://storagecow.eu/index.php?dir=Xda%2FLG+G3%2FStock%2F
I know my model is D855, but there are a lot of versions with the same name, i'm not sure which one is the right for me.
I'm running 5.0 Lollipop on my G3 and wanting to downgrade back to Kitkat for root. (I don't even know why i updated to Lollipop in the first place).
Also i need to download the correct software version that i need to downgrade to (ie. KitKat), but i cannot tell the difference.
Any Help would be greatly appreciated, Thanks!
Click to expand...
Click to collapse
Do some research into the LG Flash Tool.
As long as the software is compatible with D855 you''re good! There can be different builds such as (last 3 digits) 10r or 10c, but they are essentially the same thing with just minor changes. If it's cleared for the D855 you'll be good.
There is setup that must be performed on the Flash Tool, so make sure you follow the steps in various guides attentively. I would tell you what you need to do, but I cannot remember every detail.
A lot of the guides for downgrading will be found in the same areas as guides for rooting because downgrading must be done in order for some root methods to work.

ItsJacobee said:
Do some research into the LG Flash Tool.
As long as the software is compatible with D855 you''re good! There can be different builds such as (last 3 digits) 10r or 10c, but they are essentially the same thing with just minor changes. If it's cleared for the D855 you'll be good.
There is setup that must be performed on the Flash Tool, so make sure you follow the steps in various guides attentively. I would tell you what you need to do, but I cannot remember every detail.
A lot of the guides for downgrading will be found in the same areas as guides for rooting because downgrading must be done in order for some root methods to work.
Click to expand...
Click to collapse
But how do i know what build.my phone is? It's not on any carrier and i bought it from Australia. Also, which way is better, TOT or Kdz? Thanks.

BarCouSeH said:
But how do i know what build.my phone is? It's not on any carrier and i bought it from Australia. Also, which way is better, TOT or Kdz? Thanks.
Click to expand...
Click to collapse
Any kitkat build for the D855 will suffice. I remember doing TOT, but I'm not familiar with Kdz so I cannot answer that.

Not sure which firmware versions I can install on my G4

I wonder if someone nice can help me understand a little better re what version's of firmware I can install on my G4
My G4 is Model LG-H815 I noticed the box has TWN on it so it most likely came from Taiwan (I purchased it on ebay from Kogan) and I am in Australia on Telstra network.
Is mine classed as the international version then?
It came with V10b-TWN-XX installed on it.
After reading another thread I yesterday flashed it using version from Poland 10D H81510.kdz using the KDZ flash LG Flash Tool 2014 method
It is running fine on the above and doing that flash removed the Chinese keyboard and stuff so that was good.
I noticed after checking I am still vulnerable to the Stagefright issue so would like to find a newer rom that has this issue fixed if possible.
I am confused about all the versions of ROM's going around and was hoping someone could give me an overview of the various one and pros and cons against using them on my particular G4.
I dont mind doing a complete reinstall so keeping current data isn't important.
I would also like to root the rom (mainly so I can adjust the DPI) So some help on rooting the latest ROM would also be appreciated.
Thanks for your help.
Frosty

I don't know for sure, but you could try cyanogenmod, it should have a working installerar that helps you (depends on if they made the installer for your devices)
Sent from my LG-D722 using XDA Free mobile app

If your model in the model report is H815, then you are safe to flash the unbranded European kdz. As I have said in other topics, as long as it's not H815T, or H815P or whatever, then it's fine to flash EU kdz on it.

Aoi_sora9x said:
If your model in the model report is H815, then you are safe to flash the unbranded European kdz. As I have said in other topics, as long as it's not H815T, or H815P or whatever, then it's fine to flash EU kdz on it.
Click to expand...
Click to collapse
Ok then that great - tks
So whats the latest version rom out at the moment I could use and how do I root after flashing it?
Many thanks for your help.
Frosty

The latest version that I know of is the European Open 10E.
After you flash that one using the kdz flashing method, you can check around for the rooted 10e img and flash it using low effort root method.

Aoi_sora9x said:
The latest version that I know of is the European Open 10E.
After you flash that one using the kdz flashing method, you can check around for the rooted 10e img and flash it using low effort root method.
Click to expand...
Click to collapse
OK all done - all working fine..
One small issue one of the apps I use "Netatmo" will no longer install "This item is not compatible with your system" error when trying to install from the G4 or via GooglePlay on PC..
Must be some sort of region thing perhaps?
And I get "Warning current version is not avalible for user ....." error on boot up.
Any idea how to get around that?
Thanks again.

AFAIK no way to get rid of that, but it doesn't affect any usability of the phone, so I just learn to ignore it.

Aoi_sora9x said:
AFAIK no way to get rid of that, but it doesn't affect any usability of the phone, so I just learn to ignore it.
Click to expand...
Click to collapse
OK then no problem - yeah it doesn't matter much
Tks

Aoi_sora9x said:
AFAIK no way to get rid of that, but it doesn't affect any usability of the phone, so I just learn to ignore it.
Click to expand...
Click to collapse
Yes there is a way to get rid of it, as long as you have root. I don't know the specifics but I read it in one of the threads. Just search the error I'm sure you'll find it.

Rollback Number

Hey guys,
Does anyone know how we can get the rollback number on our devices? I was reading this thread here:
http://forum.xda-developers.com/g4/...wngrade-g4-t3197675/post62748057#post62748057
I guess you need to know your rollback number to do a KDZ becasue there is a chance of a hard brick. I tried the numbers highlighted below but it didn't work for Verizon. Anyone know how we could get this information?
waylo said:
This was not written anywhere specifically on the LG G4 forums that I could find. But every flash-addict needs to be warned. It is something you want to know before you continue tinkering.
Several users (myself included) have made the unfortunate mistake of attempting to downgrade their bootstack (for various reasons) to a former version.
DO NOT DO THIS (at least for the USA T-Mobile H811 version, and possibly other USA versions, per @autoprime)! It will result in a hard brick! Specifically, this results in the "Qualcomm QDLoader HS-USB port ( 9008 )" error. Connecting your phone to a PC will pop up with this active connection, but nothing else. There is no download mode. There is no publicly available fix as of yet.
This WILL happen both through KDZ restore as well as flashing bootstack .zips.
Yes, an official KDZ image can BRICK your USA phone, if you try to rollback.
This is in stark contrast to other manufacturers (i.e. Samsung), where the attempt to flash an older bootloader/modem/radio will simply fail, but your phone is not bricked.
I have conferred with @autoprime, who confirmed that with each OTA firmware release (on T-Mobile it was 10H, and now 10N), the version # increments. Flashing a lower version # will result in brick.
I have searched far and wide for a DIY fix. Without the proper firmwares in the right format, as well as the right flashing software, your phone is done and must be sent in for LG repair.
To check what antiroll-back version you are on, input this sequence in the dialer (T-Mobile and ATT) and scroll down:
*#*#244773825625#*#*
Flashing a bootstack version less than this # (through KDZ or zip) will brick the phone. You are free to flash anything equal or higher than the version listed.
Click to expand...
Click to collapse

sefirosu0522 said:
Hey guys,
Does anyone know how we can get the rollback number on our devices? I was reading this thread here:
http://forum.xda-developers.com/g4/...wngrade-g4-t3197675/post62748057#post62748057
I guess you need to know your rollback number to do a KDZ becasue there is a chance of a hard brick. I tried the numbers highlighted below but it didn't work for Verizon. Anyone know how we could get this information?
Click to expand...
Click to collapse
If you are still on the original software version 10b, then you have v0. If you took the OTA (or flashed the KDZ) to 11a, then you have v1.
We have a new OTA out now, 12a. I'm not sure what version that one is, but I'm willing to bet it is v2, and you will not be able to rollback if you install it.

laurasaurisrex said:
If you are still on the original software version 10b, then you have v0. If you took the OTA (or flashed the KDZ) to 11a, then you have v1.
We have a new OTA out now, 12a. I'm not sure what version that one is, but I'm willing to bet it is v2, and you will not be able to rollback if you install it.
Click to expand...
Click to collapse
Yeah right now I'm stuck with 11A and I'm not sure what I should do. Even though my phone sucks the way it runs, I'm gonna hang in there and wait a couple weeks. See what comes out of 12A.

Well I don't believe there is a way to check or there is a known way of finding it yet. Apparently there is an APK app that reads it. Perhaps we can rip it from another rom and access the APK via the same method we do for accessing the Themes (using a launcher to do custom shortcuts).
The inability to KDZ back to original software is ridiculous. Just like 12A and the broken notifications. How stupid is it to force broken updates yet make it impossible to go back to previous backup/software. I am half tempted to just take the 12A update and force Verizon to give me another phone just to emphasize my dislike for their method of locking the system down.

Understanding the correct KDZ file, help!

Hi,
I purchased the phone in the UK from the network carrier Vodafone. I have done a fair bit of research on the rooting and unrooting process mainly via videos and reading tutorials on XDA.
I would like to root the phone and gain super user access and install some Xposed modules but would also like to be able to unroot and flash back to a stock Vodafone firmware encase I need to claim under warranty. I have been trolling the internet to get the correct KDZ file and found this site (ttp://devtester.ro/projects/lg-firmwares/country.php?country=United+Kingdom). I believe that the correct firmware may be on here but am a little confused on what the suffix and software version means to be honest.
The reason for my confusion is that I updated the firmware to 6.0 Marshmallow through the LG bridge but when I now check my phones software version it states v20b-234-15. I assume this is right but from memory the first software version when I got the phone was something like H81510B_00.
I cant remember exactly what it was before unfortunately but the KDZ files I have found state H81510C_00 (Suffix - AVDFVK) and H81510C_00 (AVDFLR) and this does seem to make sense but I'm thinking it was B instead of C but and not 100% on that.
Do you think these KDZ files would be the correct one to flash back to encase I run in to some problems rooting?
I am also assuming that this KDZ is Android Lollipop and not Marshmallow so is it OK to use this to revert back from Marshmallow?
Thanks and any help would be much appreciated.
Ross

The 10X version are all Lollipop, 20X is marshmallow.
When flashing a KDZ on your phone, what's important is what model your phone is. H815 in your case.
If you want to restore to stock in case something goes wrong, you can find everything here: http://forum.xda-developers.com/g4/general/guide-lg-g4-stock-firmware-to-stock-kdz-t3107848
In there is a link to this directory: http://storagecow.eu/index.php?dir=Xda/LG+G4/ where you find pretty much all KDZ files for G4 phones.
I'm not that experienced myself, but I rooted my phone just recently and I can share my experience with you.
I have a H815. It was a V10c-TWN-XX version (Taiwan). I updated to Marshmallow with LG Bridge also and the new software version was V20b-TWN-XX.
Marshmallow rooting is not possible on my phone because I can't unlock the bootloader on it. And Marshmallow rooting is only possible with an unlocked bootloader. Unlocking the bootloader is only possible on European phones (http://developer.lge.com/resource/mobile/RetrieveBootloader.dev?categoryTypeCode=ANRS). I asked autoprime (renown user and developer here) if I can unlock bootloader after flashing an European KDZ on it. He said no, having European software on it is not enough, it has to be a phone manufactured for the european market. Dont know why, guess because of different hardware.
So, not being able to root MM, I had to revert back to stock (downgrade) using one of the KDZs.
I chose the most recent one in the directory I linked (which is the Poland H81510E). In the "Go Back to Stock" thread I linked the OP says to use LG Flash Tool 2014, which unfortunately doesn't work with Marshmallow. But fret not, it works with LG UP! http://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803
When I tried flashing the KDZ with Flash Tool 2014, the process failed with an error at 5%. It worked flawlessly with LG UP. Here's more information regarding downgrading, but it really isnt hard. Just download + install LG UP. Launch it. Connect your phone. Choose KDZ file. Select option "upgrade". Hit start.
NOTE: after the firmware update was done, the phone rebooted automatically and for me it stuck at at the LG Logo (bootloop). But a simple hard factory reset did it, the phone booted and my new version was 10e-something. With Lollipop 5.1 of course.
After that, I rooted my phone using this pre-rooted image: http://forum.xda-developers.com/g4/development/h815-eu-l-p-t-sea-twn-t3176195
and this guide: http://forum.xda-developers.com/g4/...-tmo-vzw-intl-variants-soon-root-lg-t3164765/
I now have a "H81510e-EUR-XX" Lollipop 5.1 with root (SuperSU 2.49).
I don't really know about Vodafone and if carrier specific firmware is necessary in this case. If not, you could use any 815 firmware.
From the site you have linked with the KDZ files..... it seems they are all the same.
If you check the table for H815 KDZs from Vodafone, there are some 10C and 10D versions. Now I compared the fileKey parameter in the URL to the 10C files and the 10D files and also the bytes of the files.
All the 10C version are identical to each other, same for 10D.
Check out this screenshot I made for you: http://i.imgur.com/Ie0w4us.png
Bytes are also identical, so it's pretty safe to say those are the same files.
Dont know why they are listed several times there. The suffix doesnt matter.
I'd grab a 10D if I were you. But I think the Poland 10E should work, too. Better confirm it with somebody else though.
If you flash your system to 10e, you can use the pre-rooted image I used. Otherwise you will have to inject root yourself: http://forum.xda-developers.com/g4/general/lg-g4-100-root-success-directives-root-t3180586. In this method you create an image of your system and inject root into the image, which you then flash back on your phone.

Downgrading a Att LG G4 from MM to LP?

Came with MM from the factory and I want to roll back for root. The build number is MRA58k and software H81020n. Anyone know if it will work and if so would anyone happen to have the proper kdz or tot I need? Thank guys.

Found this on another thread
I was looking for the same info, i haven't tried it but they claim to have done it successfully.

lwg45714 said:
Came with MM from the factory and I want to roll back for root. The build number is MRA58k and software H81020n. Anyone know if it will work and if so would anyone happen to have the proper kdz or tot I need? Thank guys.
Click to expand...
Click to collapse
i did mine you just need LGUP.. i have TMOBILE and i can only downgrade to LP 10N.. lower then that will brick my phone... or go back to MM 20i.
http://forum.xda-developers.com/g4/general/guide-lg-g4-stock-firmware-to-stock-kdz-t3107848

raptorddd said:
i did mine you just need LGUP.. i have TMOBILE and i can only downgrade to LP 10N.. lower then that will brick my phone... or go back to MM 20i.
http://forum.xda-developers.com/g4/general/guide-lg-g4-stock-firmware-to-stock-kdz-t3107848
Click to expand...
Click to collapse
Hello friend, i found out that my antirollback is 0, so i tried via LGUP to downgrade from MM to LP, but still get error 0x2000, can you help me?

LoneWanderer_97 said:
Hello friend, i found out that my antirollback is 0, so i tried via LGUP to downgrade from MM to LP, but still get error 0x2000, can you help me?
Click to expand...
Click to collapse
not familiar with that error. but seems like maybe you cant you need to find out searching if others have by using same variant.. i did find 2 links
https://forum.xda-developers.com/showpost.php?p=68917209&postcount=2261
https://forum.xda-developers.com/showpost.php?p=65346756&postcount=36
post your question in first link..