yashsingh1/xdaforums huggingface dataset:
[G3 General] Hnk1:
Mate I do not own a d855. I have attached a QCN in first post with blank imei and I will write up a method how to change your imei and that will be uploaded in few minutes hopefully.

So can you try to do that ? Restore yourself because I do not own the device and I can not repair it using my phone.

I checked your QCN. 3g and 2g works very well and 4g is detected but I am not able to connect to it. seems like some issue with that.

I get 4 to 5 bars at my home where I hardly get any signals most of the time from my provider so that is good. I will send you back your qcn in a while.

Your imei is partially lost as well.

[MENTION=7495528]hdmuzzillo[/MENTION]

IGNORE IT

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

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

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

I found these values for 3g and 2g. Let me try to repair these values and write back

GSM

548

553

727 822

896

903

904

912

913

923

1273 1304

1894

3502 5

4111

4869 72

5080 5087

5107

5270 73

5291 5398

06802

06850

07145

GPRS

911

947

1030 31

2508 12

3628 30

4116 4117

4209

4432

5379

VALUE FOR WCDMA

549 564

856 895

1347 1348

1791 1798

1908 1912

1931

1963 1987

3649

3851 52

4173

4194 99

4210 4211

5090 5274

5274 79

5457 5777

6482 85

65546

65635 64

Let me repair them mate and get back to you. Check in an hour or so
[G3 General] Yadro:
I have tried the method but it gets stuck at 5% during restoring.

I think maybe its because i am using windows 10 and its not supported.dunno though
[G3 General] Hnk1:
I have made a new qcn with everything working. Kindly check and report back as this should enable 4g as well

[MENTION=7495528]hdmuzzillo[/MENTION]

[MENTION=4292266]Colicablb[/MENTION]

[MENTION=3979613]klajdibushi[/MENTION]

[MENTION=7449796]Alexrr95[/MENTION]

Check this qcn, It has null imei with everything working,

it is for D850 only

I am not sure if 3g works with this as i have suddenly lost my 3g by trying to repair. Not sure if it is qcn related or hardware.

If someone can provide with full working qcn for d850 , that'll be of great help. Only inbox me. I will change its imei to null and post for all users. [MENTION=7495528]hdmuzzillo[/MENTION]

Can you help with your second ?
[G3 General] Yadro:
Hello mate.

I tried the qcn in the first page you provided.

I was able to restore the file,no 5% error as last time.

I am now able to connect to 2g 3g towers without any problems.

When switching to 4g it loses signal and searches for 4g network and after a few seconds switches back to 3g.

No signal lost so far (1 hour since i restored it)

What do you suggest?Leave it or search and try another qcn?
[G3 General] Hnk1:
Try another QCN. Make a backup so in case you want to go back previous one , you can.

Good Luck !
[G3 General] Yadro:
Seems like it was a false alarm.

The issue is still present but it losses connection now not as frequent.

I have backuped my original qcn file so i will mess with other qcns as well.

Will let you know.

Thanks
[G3 General] Hnk1:
I am trying to figure few things out myself. I think the qcn is also region depend and you need to flash a modem from your region or latest modem via twrp and maybe that helps ?
[G3 General] Yadro:
Latest modem works only on original kdz.i am rooted.tried it and had no signal at all.
[G3 General] hdmuzzillo:
Hi Hnk1

The 2nd unit is on the way to arrive next week, still I expect to have some issues too as seems that unit cant connect to any network, its able to detect available networks but can connect to them... still Ill do a full backup as soon arrived.

About the last .qcn you have posted Ill check asap and report back.

BRs

---------- Post added at 05:35 PM ---------- Previous post was at 05:29 PM ----------

There no regional modems for D850, Ive a few D855AR but modems are not compatible, its a total dead signal if you try a D855 modem on D850...

I still believe the best way is to compare both .qcn files Ive mentioned and try to edit by adding 4G values but I also think what we try to do is affected by modem version...

Just in case we might try to add rom and baseband version in refference to each .qcn testings?

---------- Post added at 05:37 PM ---------- Previous post was at 05:35 PM ----------

Hi Yadro,

Glad now you can at least run 3g, so seems the .qcn file acted the same in our devices, I was stuck at 2g and now I have 3g afted this .qcn flash,

Which rom and modem are you running?

BRs
[G3 General] Yadro:
Hello.

The problem still happens,but not so frequent as it used to but still the issue its there.

I am running fulmics 5.3

As for the modem not the latest but one before the latest one.

The latest modem works only on original kdz from Lg.
[G3 General] hdmuzzillo:
Which is exactly the problem you are having now?
[G3 General] Yadro:
On 3g network the signal gets disconnected,keeps searching for a few seconds and comes back.

If i try 4g it will keep searching until eventually switch to 3g automatically and then again lose signal and connect again to the tower.

The signal can remain strong for 30-60 mins until it disconnects and connects again.

Such issues do not happen when i leave it to 2g tower.
[G3 General] hdmuzzillo:
Similar acting but less frequent... seems something needs to be polished but we are much closer to it
[G3 General] Hnk1:
I tried using other methods to work things out but not much of luck I am afraid/ I tried merging both qcn, tried to use half values from one qcn to another but can not seem to work it out. So I am still clueless what should be done apart from getting a fully working qcn from a software guy/ visiting a guy who owns a box like octopus etc

Lets see if i sell this device like many others or repair it from a guy.

My problem is strange one though, I get all 2g 3g and 4g but 3g only in where signal is the strongest. If i flash a qcn with strong 2g and 3g, after a restart, again i get 4g and can not get 3g everywhere unless i put another provider.

Now I am going to restore my device to the first backup when it came. It was before I made any changes so lets see if it fixes everything for me or not
[G3 General] Yadro:
Do you suggest going back to kit kat? Unroot and install official kdz
[G3 General] hdmuzzillo:
As far I know there no official kdz for d850... Only tot. If any of you hs stock kdz let me know. Fulmics has great performance and looks but seens to be a battery killer...
[G3 General] Colicablb:
there you go

http://xdaforums.com/lg-g3/help/lg-g3-solution-fix-change-broken-imei-t3400807

link to my post !!

---------- Post added at 07:21 PM ---------- Previous post was at 07:20 PM ----------

link to my post!

http://xdaforums.com/lg-g3/help/lg-g3-solution-fix-change-broken-imei-t3400807
[G3 General] ferhatcengiz:
Lg g3 d850 fulmics 5.3 yüklü şebeke sıkıntısı çekiyorum 4g bazen çekiyor bazen çekmiyor 3g de 2 dişin altına düştümü internete girmiyo ://

LG-D850 cihazımdan Tapatalk kullanılarak gönderildi
[G3 General] Hnk1:
Fulmics with xceed for great battery but we are diverting from the topic

I did more tests today for hours actually.

I have understood one thing that there is more to qcn than we think it is. The problem is not always due to the fact that qcn is broken or corrupt. However, some partitions are also responsible for ESN which at times goes hand in hand with IMEI and interferes with the signals. Therefore when we change our QCN, it changes ESN as well and thus conflicts with your qcn (new and old and thus causes problems)

The solution which I have found working is this in following order

Flash a working qcn in here, it is 2g 3g one which i uploaded earlier (I flashed innumerous qcns)

Wipe paritions (will instruct the commands. I have given on 7th page though)

restart

flash a working qcn on it again

Profit ? NO then carry on

install d850 TOT stock 4.4.2 (I did 3 times strangely. it was connected and it carried on flashing my device)

Then I installed a qcn which broke everything in my phone, I got no signals. (I will upload it later)

So I just simply reflashed my old qcn which I have uploaded with null imei.

It did not work till here

So I went to flash Lollipop stock with modem of D850.

My imei became null after flash after i flashed my qcn via ZX lg tools (will upload it later)

Next I flashed it using Zx Lg tools cracked version the QCN again

It restored everything back. Everything came to work fine

The reason why I tell you that QCN works or not because under imei number in about settings, i saw different numbers on IMEI SV which led to the conclusion that it is not just qcn that is affected but IMEI SV is also affected and thus that fixed it.

PS : If you phone came with lollipop or kitkat and everything worked, I suggest you go back to that android version before checking everything works for you or not. Because if your phone has been unlocked by a box, sometimes when you upgrade, it messes up your QCN
[G3 General] Yadro:
Hi.

Will gladly try your method when you provide step by step instructions.

I am d855 btw so i dunno if it will work or not.
[G3 General] Hnk1:
Another thing mate, i will write you how to flash any QCN to your phone without any errors. Good Luck

Try that before all the way from scratch.

Download this from here :

http://www.4shared.com/rar/EgDgbDMSba/Z3X_LG_2-3G_Tool_7_9_CRACKED.htm

password is 123

Then install and use loader to run the file. (i had to disable my antivirus)

Afterwards, flash all the qcns i emailed you before..

Another method is using QPST ServiceProg. Load from file and then write to phone. It may give errors so above method is far better

Good luck
[G3 General] Yadro:
I will be waiting :)
[G3 General] Hnk1:
Check my previous post . Updated
[G3 General] hdmuzzillo:
Hi there, Ill download this tool and give it a try with the last .qcn file youve uploaded from your phone to see if fix 4G and report back asap. brs
[G3 General] G.D.Carter:
I am trying to use QPST to do this I got it to make a backup of the partitions but I can't get QPST to recognize the device.

The phone shows up on the device list as "LGE Mible USB Serial Port (COM4)" and I tried to add it through the configuration but it refuses to find the device. I have enabled diag and setprop but this still doesn't seem to have helped. Is there some way to make sure that the setprop and diag is enabled? I was able to back up so I would think that these would be ok.

Thanks,

---------- Post added at 03:05 PM ---------- Previous post was at 02:27 PM ----------

Got this to work and made a backup (not sure why it magically noticed it finally). But when I try to update it states (Memory Restore Failed) (Recevied an invalid command from the phone) at 11%.
[G3 General] Hnk1:
Did you check the first post and all the posts after especially how to boot into diagnostic mode which is in further reading ?

Secondly the guide updated was for certain people which had issues with qcn after flash.
[G3 General] Akopps:
Hnk1,

there are a few issues with your original tutorial.

First, I see no /sys/devices/platform/lg_diag_cmd/diag_enable path on the stock LG ROMs or under Cyanogenmod12.1. Second, The EFS backup tool does not work with either stock ROM or Cyanogenmod again (something about find: permission denied trying to enumerate devices or partitions). I was wondering how come none of this works, and then realized that you must have done all of this under Fulmics ROM.

So I flashed Fulmics, and then your instructions work. You have got to update the tutorial or at least mention it was tested with that ROM only.

Then, I personally did a lot of searching to find a D850 QCN file, and the only one I locate was the fixed D850 ROM you have posted a few pages back. I flashed this QCN, but that changed my IMEI. Then I devices to use the Qualcomm NV editor to change it back. However, in the NV editor utility, the NV value of 457 is not displayed. Do you know why this could happen?
[G3 General] Hnk1:
The guide has been tested in Lollipop Marshmallow and Kit Kat official stocks roms as well as fulmics.

Just type both commands in cmd and it will work. They only work on stock or stock based roms so it will work on other stock based roms as well.

If you look closely you will find how to change your imei back in few posts earlier a user posted that.

Lastly, read the guide. Why would you use qcn which was not meant for you but to a specific person?

I have uploaded my qcn which has null imei in few posts earlier too.

Read the posts fully . use efs backup tool to change imei back to original.
[G3 General] hdmuzzillo:
Hi [MENTION=5022682]Hnk1[/MENTION]

Update:

I finally got some time to flash your .QCN and restore my original IMEI at one of my devices, Ill give it a week testdrive and let you know since its more than just the missing LTE issue as I would also like to test signal quality...

Ive 3 more D850 at my desk but all of them arrived with broken .qcn so they are not good for archive backup files, I also have D855AR available just in case you might need any from them let me know!

BRs
[G3 General] hdmuzzillo:
Hi [MENTION=5022682]Hnk1[/MENTION]

Early update:

Once Ive flashed and IMEI restored I was able to briefly see 4G and measure over 10mb/s download, oddly while doing download test the phone restarted and once back wasnt able to connect any carrier, even when able to display available networks... tried to flash again and same results only this time from scratch no connection... I had to return back to a trusted 3g only .qcn file

WE ARE SO CLOSE....

Does file size is any indicator of features missing? Im testing files from 360kb to 515kb and bigger file is which works best...
[G3 General] Hnk1:
I suggest you do this :

Clear partitions. Check first post again. I added that recently.

Flash qcn via z3 box crack software.

Reboot and try again.

If this doesn't work, i suggest you do a TOT reflash to stock, root and do the above.i.e flash a qcn and then factory reset ohone.

Make a twrp back up and it will save time when you want to revert back to your current rom n settings.

Good luck
[G3 General] hdmuzzillo:
Ill try your 1st suggestion but I dont have the latest TOT image for D850 yet... Ill let u know if any progress. Thanks
[G3 General] Shivam1754:
in my mobile only 2g is working not catching 3g or 4g .......can u please give me the clear steps/////////
[G3 General] Hnk1:
Read the thread first post. It is written very clearly in it
[G3 General] Shivam1754:
i am just confused that on first page from where to where solve network solution and from where to where imei changing solution ..............
[G3 General] Medox Rsb:
how to enable 4g on d722 kitkat
[G3 General] hdmuzzillo:
Hi [MENTION=5022682]Hnk1[/MENTION]

Ive a new question but I think is out of this topic so Ill try to be short.

Another D850 unit just arrived already with TWRP and debloated 5.0.2 bumped, of course there is no original EFS backup as someone already messed arround on this unit. IMEI was check OK and unit is clean but cant discover any network, just seems stuck at manual network search, no call service. BT and WiFi works. Any suggestion were to start? Its a nice mini tablet now...

Now back on topic Im downloading TOT files to give it a second try at your .qcn file.

BRs!
[G3 General] gallego18:
Hi! i followed the steps and just received signal 4g/3g for 2 minutes! have G3 d850 in Argentina. Thanks i keep trying!
[G3 General] Hnk1:
Guide updated. Look again

I will be waiting mate.

model ? How it started. Give me all details and upload your backup and inbox me if you want me to look at it.

If you phone supports it, only then you can enable it. this thread is for those who had fully working 3g 4g and suddenly lost signals

I think try flashing a new radio of D850 and a new qcn and see if that helps. Else do the basics.

TOT method back to KITKAT. Root and flash a qcn and see if that helps.

I am glad it worked for you.

The best method is do a factory reset after flashing QCN
[G3 General] Medox Rsb:
If you phone supports it, only then you can enable it. this thread is for those who had fully working 3g 4g and suddenly lost signals

Yes Supports 4g. Only appear in v20. Do not appear in v10.
[G3 General] gallego18:
Do you think that if i do a factory reset, might work? I flashed the QCN provides by you with null imei, then i write my imei whit NV_manager in 550 value, after reboot phone the signal 4g/3g picked up only for a few moments and then lost, leaving only again 2g.

Now Im working with qcn from google at least enables 3g and write my imei.

Very Thanks you!!
[G3 General] hdmuzzillo:
Factory reset wont do much unless some files lost... So far the best we can have is 3G, not sure whats the issue with the .qcn that only connects to 4g for few minutes and then back to 2g making impossible to get 4g again, I was also forced to re flash a 3g qcn. Now im back to stock kitkat but will have to wait a few weeks to find time for more testings...
[G3 General] gallego18:
Thanks you, if i dial 2945#*850# the phone says "this phone is permanently locked and cannot be unlocked" do you think than can exist any relation with the 4g issue?
[G3 General] hdmuzzillo:
The only phone I have that display the same sentence cannot catch any network at all, owner introduced several time a wrong unlock code. No calls, no sms, no 2g, 3g, 4g... Im confused as you should not have any signal at all. Have you checked if your unit is legit?
[G3 General] gallego18:
Yes It is legit, I bought in USA.

surely with changes qcn imeis roms etc and attempt to repair the 4g connection produced this.

In this thread show how to solve this:

http://xdaforums.com/att-lg-g3/help/help-lg-g3-d850-permanent-sim-locked-t3413838
[G3 General] hdmuzzillo:
This unit never lost his IMEI, its locked because owner didnt input the code right, only legal solution for this is to call the carrier, prove identity and have the phone unlocked by them, its not the same case than the link you have posted.

If you are using the stable .qcn file we are using as dev base you wont have 4g in Argentina, I was not able to get 4g at any of my D850 tested so far, once we find a .qcn that works with 4g we will be able to try it, null the IMEI and post as solution.
[G3 General] gallego18:
If it worth, in this thread ( http://xdaforums.com/showthread.php?t=2353379 ) they have the same issue but in a samsung At&T terminal (only 2g, or 4g for five minuts). They found a solution Writing NV
[G3 General] smalakar:
3g issue with lg g3 d855 indian version

Hi team, this is Sudip here, I have lg g3 d855 indian version, and I have installed 21c baseband as I was not able to install MM rom in it. now I have installed stock MM and facing issue with the 3g packet data. it does not detect 3g packet data, it detects signal but does not show h or h+ and also the internet connection is not there, most of the time it stays on E (edge). if I use the same sim in a different ph it detects the 3g fine, and then if I take that sim out and reinsert in the g3 it starts detecting the 3g for some time and then it vanishes again and goes back to Edge. have done all the basic things, even deleted data, delvik cache, cache and system and reinstalled everything, but still this is happening. but strange thing is the issue is happening with 2 sims (reliance & Airtel), there is one Vodafone sim with which the 3g is working fine.

I have installed 30b baseband as well, but that also does not work. what is the issue? Please help :crying:
[G3 General] Hnk1:
I do not think your issue is related to QCN. I suggest you make an APN and see what happens.
[G3 General] smalakar:
Hi, just have installed cm 12 initially it was detecting 3g, and then after some time it has become E, sharing the screenshots of network search result list, APN and the selected network mode. also sharing the link of my EFS backup so that if you want you can look into it if anything worng with it?

Thanks in advance.
[G3 General] Hnk1:
Do not attach EFS data here. I got it in my inbox. So remove it firstly.

I can see that you can detect networks which means EFS seems to be working.

I suggest move back to official STOCK rom and report to me. If it still does not work, we can work something out. It could be simply CM 3g bug.
[G3 General] smalakar:
Thank you, removed the link from my original post, but still can see that in your reply as you have mentioned me. any way just flashed stock mm and now when I select gsm/wcdma auto it detects only E I have to select "wcdma Only" then it detects 3g and access the data as well. there is another option "gsm/wcdma/LTE/Auto", if I select that it access E only. U think there is a problem?......

Hi..this is an update after 2\3 hours...and the phone is detecting the 2g 3g signals but no data access...have installed exceed kernel...
[G3 General] Hnk1:
Please explain as much as you can. I still can not understand your problem fully.

You told me that 3g is working and so is data but after flashing xceed you have troubles?

It could be that in your area, 3g signals are weak and thus they automatically go back to 2g.

Does it detect and connect to 3g and 4g network in terms of signals? Check in settings >About and see what does you phone say your signals?

Unknown or something ? or 3g ? HSPA?

Connecting to data is secondary problem
[G3 General] smalakar:
it always detect the signals, 2g or 3g (lets forget 4g) but the data connection does not stay long, let me attach the snaps accordingly... please check...it always get the signals, but the data connection does not come up like H or E... sometimes it comes up but does not provide data and goes off again... have reinstalled roms many times, and right after the installation of rom it works for some time and then it goes off.(please keep in mind signal always stays), no issue with the apn as other phones are working..please do let me know if you need any other information.. currently I am on stock mm with xceed kernel.
[G3 General] Hnk1:
I saw your screenshots. your device 100% detects 3g and works fine. i think you need to disable roaming or enable data usage on roaming. See if that helps mate. If you still want to try to change qcn, i can assist you but do understand that you must make a fully working backup using EFS professional of all partitions plus twrp and also from qualcomm before doing so.
[G3 General] Hnk1:
I can provide to you with my NV values if that helps but i tried and i could not even restore my backup using qpst or qxdm. I was lucky that I had backup with TWRP. So always backup as see if you want to try this and I can provide whatever needed!
[G3 General] gallego18:
Hi, if you provide me NV values i will try with these and look what happen. With qcn file null imei that you provided in this thread and flashing it through QPST i could have 4g/3g for 5 minutes and then only 2g (

this has given me hope that works 4g) THANKS You!
[G3 General] smalakar:
I understand, but what could cause the issue? do you think qcn is necessary in this scenario at all? I am totally clueless. I have deleted the cache, delvik cache, system and data multiple times and reinstalled stock mm and CM12 and 13, flashed 21c baseband and 30b too, but in case of 30b the phone does not shutdown and does not detect any signal.

if I reinstall a rom, the packet data works fine for 30 minutes (signal is always there as I said), then suddenly it vanishes(the packet data symbol) and does not come back, have tried with 2 different sims, same issue and those sims works fine in other phone !! after some time the packet data symbol comes up for some time works and then vanishes again!! I am really helpless here and out of logic :(. if there were any hardware issue then the packet data wouldn't have worked for anytime (like it is working intermittently).

One more thing I would like to highlight here. when I tried to take backup using qpst it does not detect my phone, it detects the device on the com port but does not detect the model, it shows "no phone detected" and also says "no ESN", do you think that can be an issue? the device's ESN has been corrupted? not sure, have no deep ideas like you ppl.