yashsingh1/xdaforums huggingface dataset:
[G3 General] Hnk1:
You can try another QCN. I can provide you few but revert back to your original imei afterwards

We can try changing QCN but you must back up first. If you have proper drivers, then in screenshots you send, you need to ADD port and select from ADD if it is not detected. Did you turn on USB debugging ?
[G3 General] smalakar:
yeah USB debugging was on, but you know what I just came to a different location (around 150 kilometer away) from the last one where I was facing issue, and here I dont face any issue with the packet data, with the same sims. I guess the phone is fine and the qcn as well, what do you say?

Still the qpst should detect the phone, I will try it again and let you know.
[G3 General] gallego18:
Shure, when I flash a QCN then i put my original IMEI with NV manager
[G3 General] cap1tal1sm:
Anyone having issues where you start to lose 4G and it turns into 1x? A restart temporarily fixes it but then it just happens again...

I've had my VS985 for 2 years now and it's only started happening in the past month...
[G3 General] dobrzann:
I have problem during QCN flash 4% and "received an invalid command from the phone"

In EFS NV tools "cannot write: NV_EU_IMEI_I"

someone help?
[G3 General] Hnk1:
Check your inbox. Will provide you

What do you mean by 1x ? Do you lose signals or something ? Be more specific and also have you tried factory reset ? and maybe repair your phone with TOT method and still facing issues?

More details mate
[G3 General] dobrzann:
After flash CM13 I was tried back to stock MM but now have problem with 3G and 4G signal and data connection, only E and H+ works fine.

I tried your quide, but have an error during restore QCN by QPST as I mentioned before "received an invalid command from the phone"

http://dobrzann.leszko.pl/pliki/error.jpg

http://dobrzann.leszko.pl/pliki/error2.jpg

http://dobrzann.leszko.pl/pliki/qpst1.jpg
[G3 General] Gonzalo LGG3:
Hi I went to DIAG MODE with a program from Google Play (SHORT CUT MASTER LITE)

I install then search a diag mode shows enable/ disable and then your phone is recongnized.

Try, it will elp you.

then i restore QCN with QPST program and now i have 3G.

then check a tutorial of the program
[G3 General] jancanes:
Hi, i already tried all different qcn provided, change imei but still service disabled. I check network status it shows signals but unknown. I checked my motherboard, it is D855 board. So any other ideas?
[G3 General] sheldon88:
I faced similar problems after installing Fulmics ROM: no LTE anymore (or, at least, not working in all cells, but just in some of them). 3G was OK, instead.

At the beginning I supposed it was a hardware problem, because even going back to stock with a TOT file, 4G was unreachable.

After several attempts, I tried to solve by restoring an EFS TWRP backup which I ran just after rooting and installing TWRP. It worked! Anyway, everytime I turn off/reboot the phone, the problem returns, so I have to pass always through recovery in order to let it work.

At the moment, I'm using Limitless MM ROM and the problem persists, so I still have to use this workaround.

Is your solution permanent, instead?
[G3 General] KOBOL:
can i have password for this file?
[G3 General] Hnk1:
12121212
[G3 General] tevims:
When i put on Gsm/Wcdma/LTE auto , my signal keep dropping after a few seconds. Now im using just the 3g network and i get ''e , h and h+" . Im having this problem for 8 months now, after updating to MM official (D855p). I already tried to flash different kinds of modem, roms, factory resets and the problem is still here :(

any solution ?

Thx
[G3 General] gallego18:
Works perfect with d851 qcn!!!!!!!!

VERY THANKS YOU FROM ARGENTINA!!!! FINALLY I COULD SOLVE THIS PROBLEM!!! NOW MY D850 WORKS ON 4G/3G/2G PERFECTLY!!!!

My cell phone only worked on 2g, and the best connection I had achieved was 3g permanently, thanks to one of the qcn you shared , but did not work 4g, I spent a lot of time this way.

but I was not really happy with this, I wanted to work 4g.

I idid the following:

Manually with root explorer i deleted files

/dev/block/mmcblk0p21

/dev/block/mmcblk0p22

/dev/zero of=/dev/block/mmcblk0p24

Then I rebooted my cell phone, and flashed a d855 qcn, and then i searched in google THE d851 QCN!! AND MAGIC, FLASHED IT AND WORKED PERFECTLY!!! then i puted my imei with RV Manager and everything in its place

I am in N&N ROm Android 6.0 similar to fulmics.

When i tried d851 qcn on stock 4.4.2, it had not connection, but i think i had forgotten delete de mmcblk0 files.!

---------- Post added at 12:52 AM ---------- Previous post was at 12:47 AM ----------

---------- Post added at 12:54 AM ---------- Previous post was at 12:52 AM ----------

Hola a todos! PUDE SOLUCIONAR EL PROBLEMA DE TENER SOLAMENTE 2G PARA EL G3 D850!

Tienen que flashear el QCN del d851 que pueden encontrar en google! Yo antes borre los archivos mmcblk0p21 , 22 y 24 con root explorer, reinicie y puse el QCN del d855, reinicie y le meti el QCN del d851 y ahí levantó perfecto 4g y también 3g y 2g. Luego puse mi IMEI y listo!!!!

Saludos espero les sirva!
[G3 General] xaamaa:
I unbrick my lg g3 D855 16 gb after i get 0 imei i repair my imei with Nv Manager but i still cant get 3g and 4g signal my phone stuck on 2g signal can anyone provide me a Working Qcn for my D855 16gb model I need help...
[G3 General] Hnk1:
rything is provided in the forum. Kindly go through it
[G3 General] xaamaa:
Can i use D855 null imei qcn from this thread it is compatiable with D855 16 Gb Model...
[G3 General] Hnk1:
Understand that everything you do is trail and error so you must backup your device and try as many qcn as you can until everything works and then you can restore your imei as instructed. I think there are more than one imei of d855 in this forum

God luck!
[G3 General] xaamaa:
I flash D855 qcn file you provide in this thread and some qcn files from google my 3g is working for few minutes but after 10 minutes its back to 2g can you help me my model is D855 16gb...
[G3 General] Hnk1:
Have you formatted partitions as written in guide?

Search manual 3g / wdcma only and see if you connect to 3g.
[G3 General] xaamaa:
Yes i wipe these partition

dd if=/dev/zero of=/dev/block/mmcblk0p21

dd if=/dev/zero of=/dev/block/mmcblk0p22

dd if=/dev/zero of=/dev/block/mmcblk0p24

Then i restart my phone and flash Qcn file with Zx lg tools i get 3g signal for few minute i try many Qcn from google and from 4shared but same after few minute it get back to 2g i also try manually to search Wcdma but its not working Please help me..
[G3 General] Hnk1:
Flash your device using TOT method and then format partitions yourself. Also, format manually as mentioned by a user above.

Then flash QCN and see

Remember, qcn is one aspect of signals but other partitions are also responsible for it as well. So you need to put that into your consideration as well. I think the guide is complete and it provides as much information as required so I do not think there should be any issue
[G3 General] gallego18:
In my case, the only qcn file that do really worked for me, was the d851 QCN. I have been flashed a lot of qcn files, and these only worked for a few minuts or hours, but these always ended in 2g.

Now with d851 qcn that i´ve found in google everythings works perfectly
[G3 General] cybertex2013:
Great guide, but you should maybe mention the author of the origin thread: http://xdaforums.com/lg-g3/help/4g-lte-capability-imei-repair-t3007524

And you can see the proof. This is exactly the same guide, but translated and copied:

DECEMBER 26, 2014

http://www.androidbrick.com/qualcomm-snapdragon-imei-tamiri-ders-4-qualcomm-snapdragon-imei-repair/

We are one great community and the author deserves acknowledgment. He was the first one that published the method.

Anyway you do a great job here!
[G3 General] Hnk1:
I actually faced this problem when i had about 3 pieces of LG G3 and therefore, I researched on this extensively over time using as many resources as possible. However, I never copy and pasted someone else guide and wrote this extensively myself.

I am sure the same thing can be written again over time.

Regardless, all credit goes to the one who thought about it and who found the method to flash qcn files and writing instructions.

Many thanks and i will add the acknowledgements (which are already there in further reading but still I will add in a more organised way)
[G3 General] cybertex2013:
Why we so often fail to fix our phones?

My thoughts.

My question is why we try different strange ways and different steps to fix our network functionality?

The answer: lack of knowledge in my opinion. And I want to understand what matters how it works and why!

I find your posts very valuable and I want to write an addition due to IMEI procedure after days of checking. I can see in many guides try this or try other solutions but the question is why?

What is the logic of all experiments?

What are the facts?

We should understand what we do and not only try to do something and wishing good luck. We have different values of variables and they must be watched and modified.

I know more and more why my steps failed and I want to find best solution. I can show you why some steps don't work as expected.

The described steps in guides don't work in most cases.

Why? Let me explain.

My case

I've got 2 phones: the same models LG G3 D855 on board.

One of them is not working "services disabled" that is a second-hand phone (not stolen, not sim locked, not blacklisted) and this is my challenge to fix it. :)

After update to MM 6.0 the EFS has been lost or corrupted but IMEI still remains correct that mean not null.

The phone sometimes is connected only to GSM Network for 2 seconds and that's all.

My way is simple.

Well, I can take original qnc file from the first working G3 phone and use part of it in my second not working G3.

And that seems to be easy and even should be easy. It is complicated matter and we fail if do not understand what we do.

Phone 1: LG G3 exported QNC File -------- > Phone 2: LG G3 import into NV memory with modification

I agree, we have more factors and dependencies to consider and I'll focus on only 3 most important numbers:

ESN

MEID

IMEI

As you see not only IMEI matters! The best way is to modify qnc file with correct data.

Wrong data in NV memory:

GSM and LTE bands!

Another question in your guide is missing information about GSM/LTE band because some of qnc files come from different geographical regions and GSM and LTE bands must be set too NV value line 1877.

There are threads and look at this:

http://xdaforums.com/galaxy-s5/general/how-to-add-rf-lte-frequency-bands-to-t2886059

http://xdaforums.com/crossdevice-dev/sony/thread-progress-please-leave-im-updating-t2871269

I am on the way to find better more efficient solution and I'm very close. without so many steps but I need more time.
[G3 General] Hnk1:
So many thanks to you mate for your insight and valuable help.

Actually, I have wanted to add few things but it has been difficult to find time to do so while the other reason being I sold my all collection of LG handsets including 3 of G3s but hopefully, within 60 days I shall update this guide when I am on vacation if i can find time.

Once again, thank you so much for taking time and writing this up.
[G3 General] cybertex2013:
Thank you for your feedback. I understand, it is difficult to find time.

I have 2 LG G3 handsets and this last one is my nightmare.

I have no choice now I want and I have to find solution.

The only way is to fix my second handset.

I almost everything know about IMEI, flashing, modems, radios but I'cant get it working.

My IMEI, MEID are correct but only ESN seems to be hazardous and IMEI SV is 0. I can see my phone number in Settings/About Phone. Really weird but I will dig deeper. Maybe someone has replaced a motherboard and the IMEI is wrong, I don't know. I've got information that the phone has lost signal after MM Update. It's possible.

Still "No service selected network (T-Mobile) unavailable". I am not 100% sure if the phone is Sim locked or not because it comes from Spain (Mobistar Network). I can't see any warning due to inserted SIM card. Only "no service".

On the other hand it can read the Sim card I can see networks but not register. The Bluetooth doesn't work (adress unavailable)and it seems to be a software issue somehow radio/modem related. I've seen a full signal with WCDMA only but I don't remember if set the APN manually for one network. That gave me hope but I want to find logic not only try, I want to understand why is so hard to fix the issue.
[G3 General] Hnk1:
Make all partitions backup with EFS Professional Tool (search xda) except system data and cache from working handset

Restore that backup to your non working set and change its IMIE.

Tell me if that works. Mine worked after I flashed all partitions backup. I might still have all partitions backup somewhere, Tell me in case if your first device doesnot work. Be advice, I have AT & T backup
[G3 General] cybertex2013:
I did it before too and I restored the EFS from the first handset. That was my first idea :)

Maybe my handset is SIM locked I can't find better explanation now.
[G3 General] cybertex2013:
I bricked my handset yesterday after I've restored modems with EFS Professional. Error in g-zipped file and after 80% my handset has been hard bricked. :)

2 hours of hard work and I had my phone back. I created the recovery partition in one of all steps using BoardDiag 2.99. The rooted phone is working fine but without recovery at the moment.

There is something interesting what I found. I remember one difference in my working LG handset there is a modem partition visible in TWRP but not visible in the second one handset.

I wanted to recreate this modem partition in the second handset using TWRP and the backup is visible but without modem that is weird. I can see ESP but not modem. If I look in TWRP of the working handset the modem is still visible.

Maybe there is a solution and I should recreate the whole structure of partitions and format all once again?

Edit: TWRP is working fine.
[G3 General] cybertex2013:
Yes, that correct,

The same TWRP the same ROMs all the same.

I think I did everything possible and after multiple tests with different QNC I get the same working handset but not able to register to any network but I can see all of them even LTE.

I flashed all available gnc's for D855 and still the same result. I can detect all networks but can't connect to 2g, WCDMA, LTE.

Maybe a hardware issue (motherboard issue)?

I know what you mean. :)

Yes, I have but using TWRP (EFS and/ or without Modems), that does the same job.

I did similar mistake instead of 24 I deleted 23. :)

Did you fix the issue?

The only help for Snapdragon's CPUs is the BoardDiag tool that can restore all partitions and system.

After brick I could fix my handset successfully.
[G3 General] Hnk1:
I need it for MS8916 Snapdragon 410 and BoardDiag does not support it. So still a brick

I will look into it after November 11th after my exams
[G3 General] cybertex2013:
Maybe look at this but for Samsung:

http://forum.gsmdevelopers.com/f35/...dloader9008-repaired-but-only-boot-loop-1879/

I wish you good luck for your exams! :)
[G3 General] zluis:
HELP

help friend, i cant fix because qpst show msg "memory restore failed" in 11% and not continue
[G3 General] Hnk1:
Which device are you using ?

Model number

Where you got can from ?

Any more information?
[G3 General] Negi9:
I have found a thread, which states that it is necessary to remove imei number from qcn file in order to restore it.

For me, the d855 with removed imei qcn was the only one which could be restored, but is only able to search for 3g, no lte.

Any other qcn displays the error "memory restore failed received an invalid command from the phone". I was not even able to restore my backed up qcn.

Can you tell us how to remove imei from a qcn file?

Any help would be appreciated.
[G3 General] shabbat:
Hi [MENTION=5022682]Hnk1[/MENTION], I am really sorry for asking here. I already asked everywhere but no one can help me. I have a Korean note 4 n916k with exynos processor and since more than 3months ago my phone only gets signal with 2G only as network mode. If I put the network mode to 3g or 4g or lte/3g/2g automatic I get emergency calls only, please could you help me to solve my phone's problem? The problem is that my phone is an exynos not Qualcomm so I can't use your method. QPST can't detect my phone. Please help me. I already tried to reflash many times stock roms with Android 5.1.1, 6.0.1 with PIT file to repartition my phone but no way. Flashed many custom roms, no way too. Please help me if you can.

Thank you
[G3 General] Hnk1:
Hello mate.

Well, the only way I can think of is you ask someone who has the same phone and ask him to make a complete backup of his partitions. (Like efs professional ) and then flash them back to your device which are responsible for signals. Usually it is efs partition /modemsetting1 /2 etc.

Be ware, in Sony it is in TA which is specific for every device and if you flash one devices TA to another although they are similar models, it will end up being hard bricked.

Good luck
[G3 General] shabbat:
Thank you, I'll search someone, I hope I can find and that can solve this problem
[G3 General] dark_prince:
Hi [MENTION=5022682]Hnk1[/MENTION], I have a D850 with exactly the same issue as described in Original Post i-e. I can browse internet on Edge/GPRS but there is no LTE/3G. I managed to get QCN of D850 from another friend but it's linked to the imei of my friend's D850.

Will this remedy work on the Marshmallow fulmics rom? or Do I have to go back to stock Kitkat rooted + busybox?

If in-case I flash the correct QCN file, I want to revert to my phone's IMEI is it possible without any impending problems? I have given this phone to my mum so I really really hope I do not screw this up lol

I've read this guide about 6 times over and I dread the point where imei is changed and I end up in a bricked phone but reading that you recovered your phone by going back & forth between D855 and D850 QCNs, I hope my D850 is able to come out unscathed from this process.

Huge thanks to your work and help

Update:

Can't select any port, the list is empty from Restore tab.

In device manager my phone is connected in diag mode as LGE Mobile USB Serial Port (Com21)

I cleared mmcblk0p21,22,24 after enabling diag mode from ADB. Then I restarted phone, enabled diag mode again to let the phone show in Device Manager. Now stuck at no ports in QPST server.

Update # 3:

I freaking love you, bro! I killed QPST server instead and installed Z3X tools. Phone got recognized in diag mode @ com21 so all I had to do was write QCN. I did it twice, rebooted phone and now its giving me 3G connectivity right up!

Sidenote: IMEI has changed but I will worry about it later as everything is working. I think QPST has some kind of enmity with Windows 8.1

I havent checked EFS Backup tool yet but I'm happy everything is working. I don't know if I will get apprehended for using another person's IMEI or not.

Huge props man! Thank you so much!
[G3 General] Hnk1:
Great mate. I'm glad.

You can change your imei using EFS processional using second Qualcomm option and revert back to original.
[G3 General] paul_zm:
my D855 seem have the similar issue now , it can't get signal or can't detect the SIM card , I want to use you method to have a try , I have a question ,will I wipe three partitions as same as you , just like your code :
[G3 General] alex.soft_r:
services disabled again

Phone LG G3 D855 16G (Russia) is not working "services disabled".

The phone sometimes is connected Network for 10-15 seconds and that's all. After that i see only SIM is removed and phone is going to reboot.

My backup modem 1,2 they in attach. Then try format it and reload from another D855, and ... nothing.

Is any hope here?

My backup

http s://mega.nz/#!4eYUTAxC
[G3 General] Saky22:
I got problems with 4g connectivity on my lg d855 but only with stock roms...on custom nougat roms I dont have any problems...4g working perfectly! Currently on crdroid 3.0 and all is ok! What could be the problem? Radio version? Custom roms are on 21c but stock rom uses 30b version! IMEI is ok and I have efs partitions backup! Any ideas?
[G3 General] paul_zm:
My situation is similar to you , I don't know how to fix it , my phone is 32GB D855
[G3 General] roykaandorp:
What worked for me to get the 4g working again, was to use the lgup tool, open the kdz file while it was on upgrade. After that i chose "Refurbish" and then "Start". Before this i've tried a lot of qcn files to get it back and different roms, radio's and modem files and kdz files with upgrade. None of these gave me a stable 4g connection (only 3g or 4g and then reboot after a while), after using the method with the lgup tool with refurbish, it worked right away.
[G3 General] paul_zm:
I flashed kdz several times , but it didn't work , then restore QCN file several time , it could have signal sometimes , but it's not stable .

Once I flashed a ROM , it is normal now , but I am not sure what works for this .:crying:
[G3 General] roykaandorp:
Be sure that when you restore the kdz file the option "refurbish" is enabled.
[G3 General] paul_zm:
Yes , and I did this more than one timea
[G3 General] silwal.mahesh47:
I have a strange problem. The problem is my sim shows up normally but after some time there is no network. It shows emergency calls only. But if i restart the phone then i get a signal again. The imei is also showing normally. I did try going to stock but that doesn't help at all. I would be really thankful if anyone can guide me to solve this problem. I have a G3 D850.
[G3 General] XFRN635:
I need fully working and stable QCN file for my LG D850.The file uploaded on first page for d850 with no imei is stable for 2G and 3G but no 4g working may be country frequncy/bands difference .and other files i found on this thread are not fully working for me .The file fixed for alixda gave me all working but it was unstable and i always lose 3g/4g network after 20mint of file flashing

---------- Post added at 03:29 AM ---------- Previous post was at 02:45 AM ----------

The file you uploaded for D850 is working only for 2g and 3g for me and 4g is not working ot detected but unable to connect .other files i found are also not fully working.one of which gives 4g/3g/2g but after 30 mint i lose my 3g and 4g only 2g remains
[G3 General] Hnk1:
Actually qcn isn't the only file responsible for it. There are some other factors as well like modem and other partitions (30+ in number)

Sometimes Qcn isn't what you need but to flash each partition.

Please read my replies in this thread and LEeco thread for more details which you can find in my profile (all replies)

Good luck
[G3 General] XFRN635:
I have read all of your replies . One thing i need is working efs backup of another lg D850 which i am unable to find from anywhere
[G3 General] silwal.mahesh47:
I used the efs file linked in the first post. I did fix my problem. Why don't you try that.
[G3 General] XFRN635:
But it didn't work for me