network problem - AT&T Samsung Galaxy S8 Questions & Answers

I have a problem with my G950U, network connection not stable.
I need backup a QCN from working phone, can anyone help. It`s easy to read via QPST.

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Galaxy S4 I9506 2g network problem

Hi,
I Have a galaxy i9506 (orange france android 4.3),
Phone was unlocked now but I have no network on 2G , 3G finds network just fine.
Any way to fix this? Can I rewrite modem file and then try to unlock with *#0011# method?
If this is posible can someone direct me to a good modem file?
Thank you.
If i write modem is posible to unlock by nck code i supose. I realy need 2g network.
How can I bring the phone to it's original state (locked orange france) so I can the use a NCK code to unlock it?
Flash the france orange firmware from sammobile's firmware database. Instructions are on the same page as the download. I can't link, sorry.
I did that , It kept all my programs and settings intact , root was left intact too. I used odin 3.09 . so nothing happedend after flashing original firmware from sammobile.
Complete Refresh
nightmarepro said:
I did that , It kept all my programs and settings intact , root was left intact too. I used odin 3.09 . so nothing happedend after flashing original firmware from sammobile.
Click to expand...
Click to collapse
If you have rooted than its very good, wipe everything from recovery and flash complete firmware from odin. Its impossible that root is there, because system,kernel and recovery partitions are overwritten. However su binary app will be there but will not work because data partition remains intact.
Now back to your original problem, i don't know how you unlocked your phone? I am afraid phone's efs is not corrupted, because if everything is good means imei and modem and when phone try to register on network of locked phone then it simply ask code. Check imei, modem and network status, if your phone is registered on network and showing carrier name?
Backup efs partition before playing more because if efs is corrupted than you are finished ! I9506 is qualcomm version so QPST tool can also help in modem related issue, press thanks if it helps
Indeed after reflash i lost root. But the phone is still unlocked and no 2g signal. How can i relock it? The phone was unlocked with direct unlock option from some unlock software... dunno witch one(I bought it already unlocked and rooted )
I searched some gsm forums and found something that is said to work for I9506 too:
SPT BOX forum :
4.4.2 kitkat net probleme after supper imei unlock
connect your N9005 to the Box using USB in ( dm+modem+adb ) mode by dialing *#0808# in Samsung's Dialer ..
1st - Choose N900w8 from the list then click Repair 3G Network this will Fix the 2G network
2 - choose N9005 again and press repair 3G network again this will Fix the 3G network with 2G working too
Unfortunately I don't think anyone in my city has SPT BOX ( .... i will search some gsm services
Identify cause
nightmarepro said:
I searched some gsm forums and found something that is said to work for I9506 too:
SPT BOX forum :
4.4.2 kitkat net probleme after supper imei unlock
connect your N9005 to the Box using USB in ( dm+modem+adb ) mode by dialing *#0808# in Samsung's Dialer ..
1st - Choose N900w8 from the list then click Repair 3G Network this will Fix the 2G network
2 - choose N9005 again and press repair 3G network again this will Fix the 3G network with 2G working too
Unfortunately I don't think anyone in my city has SPT BOX ( .... i will search some gsm services
Click to expand...
Click to collapse
I told u some points, please follow it and find out what is the root cause of your problem then try to ask or fix. You can use qualcomm nv tools and qpst for imei but first find out what is the cause then ask for help.
EFS professional also has nv tools and other fixes, use this download link
http://forum.xda-developers.com/gal...ol-updated-09-06-14-efs-professional-t1308546
galliard said:
I told u some points, please follow it and find out what is the root cause of your problem then try to ask or fix. You can use qualcomm nv tools and qpst for imei but first find out what is the cause then ask for help.
EFS professional also has nv tools and other fixes, use this download link
http://forum.xda-developers.com/gal...ol-updated-09-06-14-efs-professional-t1308546
Click to expand...
Click to collapse
Hi , thank U for the info. I must now learn how to use the program to rebuild NV of the phone ( atleast i think that i must do) . never had to do such fixes of any phone. The i9506 was unlocked by direct unlock in z3x box. After that no more 2g connectivity , the phone finds network if I manualy search but cannot connect to it. Sais emergency calls only.
Anyway I think your sugestion will fix my problem .... just have to learn how to use program
Thanks again.
I rooted phone , backed up all that I could find to backup in EFS Professional 2.1.73 and after that I tried option "repair NV Data file permisions" "Option to repair NV data file ownership to fix 'Unknown baseband' and 'No signal' issues." .... then big dissapointment .... popup "This option cannot be used with your device! " . Damn I was realy hopeing that the option will repair my 2G signal problem. Seems that I must find another solution .... maybe some other sugestions?
Thank you.
When u run efs professional u have 4 options, try 2nd option 'Qualcomm nv tools' . Check information on diagnostic tab and if u see any thing wrong try secure ops tab for ESN / MEID / IMEI repair, also first check that your phone is showing correct IMEI by *#06# which is on behind the battery.
galliard said:
When u run efs professional u have 4 options, try 2nd option 'Qualcomm nv tools' . Check information on diagnostic tab and if u see any thing wrong try secure ops tab for ESN / MEID / IMEI repair, also first check that your phone is showing correct IMEI by *#06# which is on behind the battery.
Click to expand...
Click to collapse
The phone is showing corect imei. I browsed through tabs , backed-up nvdata(took more than 30 min).I will look at diagnostics tab to see if anything shows "RED" .
Thank U.
I made some screenshots with the info shown in NV TOOLS . I don't know what to look for to see is not ok.
Plz post snaps of lockscreen, imei check window (*#06#) and phone about device. also tell me which firmware u have?
Screenshots , Firmware is Official 4.3 Orange France from Sammobile
From snaps, it seems your phone is registered on network and modem is working fine that's why showing correct IMEI. Normally when your phone is not registered on network, shows emergency call and null IMEI then you are unable to call or sms but i can't understand your case. If you are not able to call or sms then try changing different carrier sim or upgarde to latest kitkat 4.4.2, follow this link
http://samsung-updates.com/device/?id=GT-I9506
P.S. At last post snap of complete status window(in two snaps) from about device.
galliard said:
From snaps, it seems your phone is registered on network and modem is working fine that's why showing correct IMEI. Normally when your phone is not registered on network, shows emergency call and null IMEI then you are unable to call or sms but i can't understand your case. If you are not able to call or sms then try changing different carrier sim or upgarde to latest kitkat 4.4.2, follow this link
http://samsung-updates.com/device/?id=GT-I9506
P.S. At last post snap of complete status window(in two snaps) from about device.
Click to expand...
Click to collapse
Those snaps were from 3g Connection..... whitch works just fine.... I upload screenshots with 2G only network..... if I manualy search networks while in 2G it finds all of them.... but does not register on sim carrier network. If I try the other networks that it finds it sais network not alowed by sim...
i have the same problem. will look foward to this . to fix it
my carrier is orange spain and im on kitkat 4.4.2 data works.3g and 4g but 2g no.
imei is same as back also imei is not blacklisted
thanks in advance
Afraid
nightmarepro said:
Those snaps were from 3g Connection..... whitch works just fine.... I upload screenshots with 2G only network..... if I manualy search networks while in 2G it finds all of them.... but does not register on sim carrier network. If I try the other networks that it finds it sais network not alowed by sim...
Click to expand...
Click to collapse
At last i can say your phone efs is corrupt, try manually writing IMEI again from Qualcomm nv tools and flashing kitkat 4.4.2. If don't work then samsung tool (Z3X) or other hardware box can fix efs like u unlock from Z3X box.
This is free tool which offer imei repair, ChimeraTool
https://chimeratool.com/downloads

(HELP) with NV DATA

Hey Guys I need some help with Nv data (EFS )
The NV data baseband is I9500UBUAMDE nonetheless my firmware baseband is I9500UBUGNJ1
I think this is why my phone do not have a stable conection with cel-towers...
So I need to know, how to update the nv data without corrupt it?
Kindly regards,
AG
Just flash a stock ROM using Odin. This will ensure that the bootloader and modem match.
Already did it some many times... Without results...
The phone is missing the imei and MAC address?
No one is missing...
Phone signal Goes out and in.
However while the phone has signal. I can call and navigate on internet..
Do you need the efs folder?
If the phone has an imei, then it seems like the efs folder may be fine and something else is happening.
So flashes are successful in Odin?
Could the phone be blacklisted? Was it ever dropped? Tried a different SIM card? Tried our SIM card in another phone?
Ok, I have to be honest... I was on 4.4.2
I try to use galaxysim unlock. However EFS was v2 and I restore a v1 efs folder in order to unlock the phone. It works. However after upgrade to 5.0. It start to fluctuate the signal...
Note: v1 and v2 are versions in matter of security of the EFS folder...
That is how this how begins...
Did you restore the original version 2 efs? Do you have a backup of the original efs? If not, I'm not sure if an nvwriter will help.
I think I do not have one...
What should I do?.....
I'm not sure what to suggest. Maybe Google nvwriter and see if it works with your phone.

No Mobile data network after imei restore

Hello , i've restored my imei after that i flashed flash_factory.bat, after all the procedure the sim is recognized but theres no mobile data network, i flashed modem.img from fastboot, tryed to change default network type and configure manually the apn of my operator , but nothing of these works, anyone have any idea of what i should do?

Can someone provide QCN

Hello everyone, I recently picked up a this phone for cheap since I've been looking for a compact phone. Turns out the phone constantly has no service. There is no water damage, imei is fine, Sim card slot is okay, and baseband is recognized by the phone.
After dialing *#*#4636#*#*, I am unable to turn on radio. Thus making me unable to make calls or send texts. I've tried many ways to fix this error, such as flashing firmware, repairing in Sony companion application, and reboots. The Sim card in the phone is okay and works on my XZ.
I have read that restoring a working QCN file can reboot the phones imei and baseband, making GSM service usable.
Can someone here provide me with a QCN file?
Thanks.

COOL 1 [No Network Signal After Flashing ROM]

I've searched and done so many hotfixes but
Nothing work and I think it's time to ask the experts.
Here's the Problem:
My Phone was in a HardBrick, then Gladly I've made it back
by reflashing the Stock Rom of Cool 1 (EUI 5.8.18s) using QFIL
And then I noticed that there is no network signal even though the sim card is being detected. I've searched on Google on how to fix it and I find out that it must be the IMEI and I re-write the Original IMEI from the Box on my Device successfully but still, nothing happened, I still have no Network Signal. I've done reflashing again through TWRP But still, nothing happened, I tried to switch to (EUI 5.8.17s / 5.9.26s / JUI and MIUI 9) roms. I also tried the *#*#4636#*#* and change the unknown to WCDM / LTE and everything is still the same No Network Signal.
Now I am wondering if it is because I inputted an International IMEI which is written in the Box of this phone, or might be because of my baseband or kernel.
By the way, I'm from the Philippines I'm using (Globe/Smart) Teleco's Sim.
If there's anyone who could show me the right thing to fix my device, your help will be appreciated.
If You are also suffering a HardBrick Case with the same device I am willing to help you to the best of I can do.
Just Send me an Personal Message ​
Hi there!
I had the same problem, tried rebuilding IMEI's even from my other phones etc. After rebuilding IMEI, appliying qcn with QFIL (after changing to diagnostic mode)... IMEI was available, but network won't work.
But I repeated with .qcn found for C103 on internet .... and it works like a charm! Connects to network!
drive.google.com/file/d/1jp41j9n68qfIVwAKl2Uu6rU6tsfrbJhx/view?usp=sharing
My phone:
- LeRee
- OS: LOS 15.1
Just try that, you have nothing to loose. First step - let's network work
It workedd!!???
Thanks for the .qcn file link it workedddd like charm! I was searching for 2-3 days and was getting really mad ! Thanks for sharing file ! My network showed after qcn file flash!
cimon87 said:
Hi there!
I had the same problem, tried rebuilding IMEI's even from my other phones etc. After rebuilding IMEI, appliying qcn with QFIL (after changing to diagnostic mode)... IMEI was available, but network won't work.
But I repeated with .qcn found for C103 on internet .... and it works like a charm! Connects to network!
drive.google.com/file/d/1jp41j9n68qfIVwAKl2Uu6rU6tsfrbJhx/view?usp=sharing
My phone:
- LeRee
- OS: LOS 15.1
Just try that, you have nothing to loose. First step - let's network work
Click to expand...
Click to collapse
Hey, are you getting 4g network siginal after fashing this one, I'm now getting only 3g after flashing this
---------- Post added at 06:18 PM ---------- Previous post was at 06:03 PM ----------
Rajveer rj said:
Thanks for the .qcn file link it workedddd like charm! I was searching for 2-3 days and was getting really mad ! Thanks for sharing file ! My network showed after qcn file flash!
Click to expand...
Click to collapse
Hey, r u getting 3g or 4g siginal?... After flashing this, I'm getting only 3g...
Hi, I am having same problem but none of the above method worked. Pls anybody help??

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