Develop Bugs

Lost serial number V500 after stock 4.4.2 update

Hi everybody,
I've made Root and I've installed TWRP when there weren't yet advice for EFS. After return to stock with the 4.4.2 I've no serial/bluetooth address. I've decided to solve only now after a year. As you can see in the picture below is shown in Info about device screen. Having some problems about touch error in respond or no responds it's important to not avoid warranty to get serial back .
Anyone have a solution?
EDIT: Sorry, wrong image. Corrected (Added)!

You can use LG PC Suite and recover your device to stock and you will get your serial but you will lost root access. You can also install some other version of rooted stock android (I assume you installed v50018a) like v50020B or so...and you should get back you serial number and still have root access. Good luck!

java87 said:
You can use LG PC Suite and recover your device to stock and you will get your serial but you will lost root access. You can also install some other version of rooted stock android (I assume you installed v50018a) like v50020B or so...and you should get back you serial number and still have root access. Good luck!
Click to expand...
Click to collapse
No I'ven't root now and the OS is w50020D 4.4.2 stock, updated with LG Tool...
Do you think that backing to stock 4.2.1 I'll get back my serial?

AR64SH said:
No I'ven't root now and the OS is w50020D 4.4.2 stock, updated with LG Tool...
Do you think that backing to stock 4.2.1 I'll get back my serial?
Click to expand...
Click to collapse
If you used LG PC Suite to install 4.4.2. you should have your serial number. If not then try to install 4.2.2. and after that you can install KitKat via PC Suite but you will lost Loki hack.

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.

Help save a bricked lg g3

:crying:
My issues is quite complicated. Please be patient and read on.
Less than a week ago, I bought an LG G3 D855. It wasn't brand new and definitely out of warranty.
It was on the 4.4.2 Os version but I couldn't update it because I couldn't locate the UPDATE CENTER and after some research online, I found out it was because it was rooted. I couldn't find a Supersu application anywhere on the phone anyways but Root checker confirmed that it was rooted.
I downloaded the stock kitkat firmware in a .tot format and I tried flashing using LG Flash Tool for TOT but it failed because "Device version is different"
I checked the Imei online and it stated that the device is a Sprint LS990 but the details embedded in the phone all say it is D855
I checked online and found a couple of posts about this error and one user said he was able to fix it by flashing the actual Sprint .tot with the lg flash tool. I tried that but it didn't work. It still said "Device version is different. Check BIN or dll"
I checked online and found results pointing to a generic .dll file for G3s and I downloaded it but when I used it on the Flash tool, it resulted to an error "CrossDL blah blah"
So I found a Marshmallow kdz file. LGUP won't see my device model so I was able to flash it after editting the software in my build.prop to D85510n.
***I have always changed the port to COM41 in all the steps I used
The LG UP detected my model and it flashed to 100% but got stuck on a bootloop by loading the lg screen, freezing and restarting by it self. It never gets to the homescreen.
I downloaded lollipop kdz reflashed using LGUP in a form of downgrade and it got to 100% and got stuck at the lg screen while trying to reboot.
I redownloaded the stock kitkat rom and used the Lg flash tool but it failed. It said 'PID null IMEI Null"
I used LGUP to reflashed. It came to my understanding that the LGUP can flash both kdz and tot. So it flashed to 100% but got stuck at the lg screen and I have tried all I can but it is stuck. It can go into download tho. I don't know what to do about the IMEI. I don't know if the last flash retrieved it. I don't kniw what to do.
It no longer shows as LGE AndroidNet USB Serial
Please can anyone help me?
I just need my phone to work again. I was stubborn and now I regret it. I should have just stuck to kitkat. I'm so desperate to get my phone working that I wouldn't mind Android Froyo Os if it was ever possible.
PLEASE HELP!!!

I think you have to repair the IMEI...
maybe this can help
https://youtu.be/nwzgs1Cmr9k
Sent from my LG-D855 using XDA Free mobile app

I think that he forgot to hard reset after flashing the kdz.

i completly know what you should do:
1: force your phone into qualcomm 9008 mod.
2: use board diag unbrick instruction and it will boot on download mod. for unbrick you will need best kitkat tot for your G3 model.
3: flash best lollipop or kitkat tot to make your phone alive
and then flash it with any kdz you want(it should be for your G3 model)
my telegram ID : @Erfan_rv

pls help me
Apparently, it seems my bricked phone keeps disconnecting during flashing process. I dont think it the fault of the cable because I have used different ones and they all seem to work fine with other phones. I have tried a different computer and still the same results. it connects as qualcom 9008 but once I try to start flashing, it disconnects and interrupts the flashing process. my phone just shows a grey screen now when I power it up with the battery in. also, I was trying to upgrade from linear os to the latest linear os. I cant fine the tot out there so im using zv6 currently. could this also be the problem? thanks in advance

Downgrading K428 (T-Mobile) to Root it

There is good information on this forum on how to root your k428 (https://forum.xda-developers.com/lg-k10/development/root-twrp-rom-t-mobile-k428-k10-t3582493)
This however, is not possible on anything later than the 10f(?) firmware, due to there being a December 15, 2016 security update.
Firmwares I am pulling from: https://lg-firmwares.com/lg-k428sg-firmwares/
My K10 is on the most recent update 20h(?), the only thing I've done is unlock the bootloader. I'm trying to get it down to an earlier firmware version to be able to root. I have tried:
Uppercut with LGUP:
There are two separate errors I get with this. One is when I select refurbish and it gets to about 4% (On LGUP, not the phone) and it says my ".kdz does not allow refurbishing" or something along those lines.
I have tried update as well, and I get an error at 14%(on LGUP, 10% on device) and I get "invalid command response code" (image attached)
I have tried both of these options with 3 different .kdz files, so the problems aren't just unique to one file.
LG Flash Tool 2014:
When I start there is an error saying no connection to the server and no progress indicated on the phone or computer, even after maybe 1/2 hour.
After LGUP, I do have to bring my phone back with LG Bridge Update Error Recovery, but interestingly no data is lost at all so clearly my phone is not being wiped at all.
How have people successfully downgraded their k428 and how do I?
Also, is the k428 the same as the k428sg? I can't seem to figure this out and the firmwares website has slightly different specs.
I have another phone, just really hoping to switch to this one is it seems quicker, isn't running Touchwiz, has a decent camera, more storage... I won't be switching if I can't get this rooted because I have been spoiled by rooted devices.

der_cobester said:
There are two separate errors I get with this. One is when I select refurbish and it gets to about 4% (On LGUP, not the phone) and it says my ".kdz does not allow refurbishing" or something along those lines.
I have tried update as well, and I get an error at 14%(on LGUP, 10% on device) and I get "invalid command response code" (image attached)
I have tried both of these options with 3 different .kdz files, so the problems aren't just unique to one file.
[...]
After LGUP, I do have to bring my phone back with LG Bridge Update Error Recovery, but interestingly no data is lost at all so clearly my phone is not being wiped at all.
[...]
Also, is the k428 the same as the k428sg? I can't seem to figure this out and the firmwares website has slightly different specs.
I have another phone, just really hoping to switch to this one is it seems quicker, isn't running Touchwiz, has a decent camera, more storage... I won't be switching if I can't get this rooted because I have been spoiled by rooted devices.
Click to expand...
Click to collapse
Having very similar issues, at the moment stuck in a "Firmware update" loop with a T-Mobile K10 K428, after trying to downgrade from 7.0 to 6.0.1.
How are you reverting it to useable form with the LG Bridge app?
It only tells me I have the latest update then goes away.
[nevermind, this part worked]
Managed to bring the device back to functional 7.0 state, but have found no way to downgrade back to 6.0.1.. the regret I feel for allowing the update to happen before rooting the device is indescribable in frikkin words.

Hopefully someone somewhere is working on the root of this computer in Android 7.0, I have 3 of these and I need to do the root to unlock them

last Friday I could downgrade a version 10R to 10G and rooted .
but since yesterday I'm with another to downgrade but am getting error while modem part flashing .
version was 20H , I noticed once upon 20 no possible to back In 10 .

psytr0nic said:
last Friday I could downgrade a version 10R to 10G and rooted .
but since yesterday I'm with another to downgrade but am getting error while modem part flashing .
version was 20H , I noticed once upon 20 no possible to back In 10 .
Click to expand...
Click to collapse
i have been trying to make nougat downgrade to marshmallow for months. still no results. most i get is phone simply not booting OS.

SO,there is no way to downgrade from 20g?
what about about using special tools like Octoplus Box andZ3X Box?
anyone tried?
---------- Post added at 07:54 PM ---------- Previous post was at 07:53 PM ----------
SO,there is no way to downgrade from 20g?
what about about using special tools like Octoplus Box andZ3X Box?
anyone tried?

Worked Fine, min was a K428 with build number MMB29M, sec patch 2016-08-01
I did it as its posted step by step.
Nice Job!

Unable to upgrade using .kdz file

Hello, I'd like to ask for advice. I have no experience with LG G4.
I have LG-H815 with FW h81510h and I would like to upgrade to MM (v20). Unfortunately, when upgrading to LG Bridge, I'm repeatedly having an installation error. When using LGUP, the message will be displayed:
tot anti rollback version is smaller than device version
Unfortunately, the installation does not start and the device restarts, I tried several KDZ versions and the problem still the same.
thank you for your advice

LPK_CZ said:
Hello, I'd like to ask for advice. I have no experience with LG G4.
I have LG-H815 with FW h81510h and I would like to upgrade to MM (v20). Unfortunately, when upgrading to LG Bridge, I'm repeatedly having an installation error. When using LGUP, the message will be displayed:
tot anti rollback version is smaller than device version
Unfortunately, the installation does not start and the device restarts, I tried several KDZ versions and the problem still the same.
thank you for your advice
Click to expand...
Click to collapse
Your anti-rollback version is preventing you from downgrading/upgrading to any version that has a lower roll-back version. Unless you can find a downgrade/upgrade version with the same anti-rollback version as the firmware you have currently installed, you are out of luck for now. You are lucky you used LGUP-NEW to downgrade/upgrade as it throws up the error that you are making in trying to downgrade/upgrade. Do not proceed with any other flash tool(e.g., LG Flash-tool 2014) for now as you will brick your device as they do not throw up the error.
Check out steadfasterX's thread re: SALT and wait until it's completed and able to flash - you may be able to use it.
S.