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[Q] Invalid IMEI

Dear All Hi,
I have 2 china phones with Android 2.2
which are exactly the same.
After flashing one of them
I get the message:
Invalid IMEI
and the phone cannot connect to
mobile networks and make calls anymore.
Is there a way to copy the good IMEI
of the phone that can make calls
to the invalid IMEI
of the phone that cannot make calls?
Thanks in advance for any info,
ff

can you revert back to the factory or stock ROM, hard reset or something?

Thanks for the reply.
I did the factory data reset
(Settings > Privacy)
but again the same:
Invalid IMEI in the status bar
no mobile networks can be connected
cannot make/receive calls
lamborg said:
can you revert back to the factory or stock ROM, hard reset or something?
Click to expand...
Click to collapse
Please help,
ff

Its probaly because there made in China, and they don't have original Android License.
Did you install a rom that was made for your phone, because it is chinese you know. And you should indeed go back to stock rom

I have installed the rom that was made for my specific phone
and the specific model that i have. (2 of them)
I flashed the phone to get the latest firmware that the phone maker
said was released to fix a lot of bugs.
The phone maker also said they had tested the flash tool
with the latest firmware and the phones were working OK at their end.
But in my case the phone although it was working fine before the upgrade
after the upgrade it shows in the status bar "Invalid IMEI"
and cannot connect to networks and make calls.
Any ideas anyone?
nathan-96 said:
Its probaly because there made in China, and they don't have original Android License.
Did you install a rom that was made for your phone, because it is chinese you know. And you should indeed go back to stock rom
Click to expand...
Click to collapse

Be sure you installed it right. Do factory reset, or search if patch is avaidable
Samsung Galaxy Gio
CM 7.2 20120325 (thanks 2 phiezx)
XDA Premium
Dont say 'thanks', just press the button

Fixed it!
Invalid IMEI
Had to:
1-root it with "SuperOneClick"
2-install "root explorer"
3-copy the file "MP0B_001"
from the good phone to the bad phone.
(Location: /data/nvram/md/NVRAM/NVD_IMEI/.. )
Before rooting, the above file should have been backed up,
but i had the same phone working so a copy did the trick!
ff

ffinder said:
Fixed it!
Invalid IMEI
Had to:
1-root it with "SuperOneClick"
2-install "root explorer"
3-copy the file "MP0B_001"
from the good phone to the bad phone.
(Location: /data/nvram/md/NVRAM/NVD_IMEI/.. )
Before rooting, the above file should have been backed up,
but i had the same phone working so a copy did the trick!
ff
Click to expand...
Click to collapse
good job,
(solved now)

ffinder said:
Dear All Hi,
I have 2 china phones with Android 2.2
which are exactly the same.
After flashing one of them
I get the message:
Invalid IMEI
and the phone cannot connect to
mobile networks and make calls anymore.
Is there a way to copy the good IMEI
of the phone that can make calls
to the invalid IMEI
of the phone that cannot make calls?
Thanks in advance for any info,
ff
Click to expand...
Click to collapse
i have the same problem with galaxy s3 China with dual sim
can u tell me if u fix ur prob ?

ffinder said:
Fixed it!
Invalid IMEI
Had to:
1-root it with "SuperOneClick"
2-install "root explorer"
3-copy the file "MP0B_001"
from the good phone to the bad phone.
(Location: /data/nvram/md/NVRAM/NVD_IMEI/.. )
Before rooting, the above file should have been backed up,
but i had the same phone working so a copy did the trick!
ff
Click to expand...
Click to collapse
great information, bookmarked for future reference if needed, thanks!

[Q] How to put the T869 in DM+MODEM+ADB mode for IMEI recovery

Hello,
I'm trying to recover the IMEI for my T869 by following this guide:
http://forum.xda-developers.com/showthread.php?t=1867442
The first step is to put the phone/tablet in diagnostics mode. There are two methods described which do this. The first one ( for TouchWiz devices, which should apply for this device ) involves using codes in the dialer to enable a hidden menu. As my tab doesn't have a dialer, this method doesn't work. I've tried 3rd party software that claim to execute codes on the tablet but they don't work.
The second method involves running a script. This fails because/sys/class/android_usb/android0/f_rmnet/transports doesn't exist on my tablet.
So, any ideas how to put my tablet in diagnostics mode or how to fix the IMEI for it ? I don't have a backup of the efs folder and the current IMEI is the generic 004999010640000.
Thanks.

MichaelIvinov said:
Hello,
I'm trying to recover the IMEI for my T869 by following this guide:
http://forum.xda-developers.com/showthread.php?t=1867442
The first step is to put the phone/tablet in diagnostics mode. There are two methods described which do this. The first one ( for TouchWiz devices, which should apply for this device ) involves using codes in the dialer to enable a hidden menu. As my tab doesn't have a dialer, this method doesn't work. I've tried 3rd party software that claim to execute codes on the tablet but they don't work.
The second method involves running a script. This fails because/sys/class/android_usb/android0/f_rmnet/transports doesn't exist on my tablet.
So, any ideas how to put my tablet in diagnostics mode or how to fix the IMEI for it ? I don't have a backup of the efs folder and the current IMEI is the generic 004999010640000.
Thanks.
Click to expand...
Click to collapse
The Dialer is part of Phone.apk, which won't show up on the T869 normally even if its "installed".
There's a file within framework-res.apk (which is found @ /res/values/bools.xml) which essentially tells the Android OS what features the host device does and does not have. The relevant value is <bool name="config_voice_capable">.
By default the T869 will have:
<bool name="config_voice_capable">false</bool>
Changing that to
<bool name="config_voice_capable">true</bool>
Tells the OS that the device is "voice capable", meaning it can make & receive phone calls. This will then allow the Phone.apk features to show up, provided you have Phone.apk installed.
The process of modifying framework-res.apk is somewhat complicated, and your ROM may or may even have Phone.apk present, depending on what you are using. However, at least now you know why you have no dialer.

DivinityCycle said:
The Dialer is part of Phone.apk, which won't show up on the T869 normally even if its "installed".
There's a file within framework-res.apk (which is found @ /res/values/bools.xml) which essentially tells the Android OS what features the host device does and does not have. The relevant value is <bool name="config_voice_capable">.
By default the T869 will have:
<bool name="config_voice_capable">false</bool>
Changing that to
<bool name="config_voice_capable">true</bool>
Tells the OS that the device is "voice capable", meaning it can make & receive phone calls. This will then allow the Phone.apk features to show up, provided you have Phone.apk installed.
The process of modifying framework-res.apk is somewhat complicated, and your ROM may or may even have Phone.apk present, depending on what you are using. However, at least now you know why you have no dialer.
Click to expand...
Click to collapse
I actually did follow your guide here: http://forum.xda-developers.com/showthread.php?t=1872348 to try to get my native dialer but never got it to work. I know that it should work, but I get endless crashes/reboots if I enable voice capabilities for my tab .. All apps crash seconds from startup. What exact ROM do you have which works for enabling the native dialer? I'm running the official ICS build.

MichaelIvinov said:
I actually did follow your guide here: http://forum.xda-developers.com/showthread.php?t=1872348 to try to get my native dialer but never got it to work. I know that it should work, but I get endless crashes/reboots if I enable voice capabilities for my tab .. All apps crash seconds from startup. What exact ROM do you have which works for enabling the native dialer? I'm running the official ICS build.
Click to expand...
Click to collapse
I pretty much only use CM10. Aorth has nightly builds of it. The last "good" CM10 is cm-10-20130118-UNOFFICIAL-t869.zip, which you can get here: http://goo.im/devs/aorth/roms/t869/
I'm curious, what purpose does retrieving the IMEI serve anyways?

DivinityCycle said:
I pretty much only use CM10. Aorth has nightly builds of it. The last "good" CM10 is cm-10-20130118-UNOFFICIAL-t869.zip, which you can get here: ....
I'm curious, what purpose does retrieving the IMEI serve anyways?
Click to expand...
Click to collapse
Well my tablet has the generic IMEI as stated above. Since about 2 days ago, my tablet hasn't been able to connect to the T-Mobile network. I have had the generic IMEI for some time and it has worked. Now either T-Mobile has decided to start blocking the IMEI from the network or my tablet is physically damaged.
I have bars, I can search for networks and it will find T-Mobile and AT&T, I've tried different SIMs with different plans and also checked the SIMs in other phones and they work. Can you connect to the T-Mobile network with the generic IMEI or do you still have your original IMEI?

MichaelIvinov said:
Well my tablet has the generic IMEI as stated above. Since about 2 days ago, my tablet hasn't been able to connect to the T-Mobile network. I have had the generic IMEI for some time and it has worked. Now either T-Mobile has decided to start blocking the IMEI from the network or my tablet is physically damaged.
I have bars, I can search for networks and it will find T-Mobile and AT&T, I've tried different SIMs with different plans and also checked the SIMs in other phones and they work. Can you connect to the T-Mobile network with the generic IMEI or do you still have your original IMEI?
Click to expand...
Click to collapse
I appear to have my "real" IMEI. I have used CM10 nightlies on this tab pretty much since day 1. Have had no problems connected to the T-Mo data network. I would imagine if the IMEI is messed up you should be able to RMA that device, which sucks

find an app called 'any cut' this will allow you to access all the intents and action your device is capable of.
One of them should be service mode.
be careful....
also , if you really want this I would definetly talk to these guys.. http://mobiletechvideos.mybigcommerce.com/samsung-galaxy-tab-plus-imei-efs-repair/
JTAG'd my GT-P6200. I know yours is the Tmobile variant, but he usually has success with new products, etc.
I would ask him.
He is in Texas US of course..
good luck..

Ok, It's confirmed: T-Mobile has started blocking the generic IMEI from their network. At least that's what I conclude from finding a thread on reddit(can't link but you can google the title) from 3 days ago, exactly when I started having the problem:
Anyone else running a custom ROM and have your IMEI reset to 004999010640000? T-Mobile likely blocked your phone today.
DivinityCycle, Just checked again and your bools.xml edit only works with CM10. I've gotten it successfully going on CM10, but the code that gets entered in the dialer only works on a TouchWiz ROM, as noted in the original thread :facepalm:
When I try the same thing on stock GingerBread / ICS I get endless application crashes / freezes so that basically i can't do anything, even launch an app, not to mention enter a code.
chrisrotolo, AnyCut - Managed to install it and create a shortcut to the ServiceMode action but when I execute that shortcut it crashes and nothing happens.
Any other tips?

you could also try factory mode, which will bring up a calculator.
From there enter the *#*# dialer code to get you into service mode...i forget it off hand but i have posted it numerous times,
also if you try another action shortcut, one that is a submenu of the service,mode main menu, such as network, etc.. and that works, you can usually back all the way up to the main menu in service mode.
also CM ROM may have these .apks removed... should be on stock ROM though.
good luck.

chrisrotolo said:
you could also try factory mode, which will bring up a calculator.
From there enter the *#*# dialer code to get you into service mode...i forget it off hand but i have posted it numerous times,
also if you try another action shortcut, one that is a submenu of the service,mode main menu, such as network, etc.. and that works, you can usually back all the way up to the main menu in service mode.
also CM ROM may have these .apks removed... should be on stock ROM though.
good luck.
Click to expand...
Click to collapse
Factory mode worked for me but did not solve my problem. I managed to put the tablet in "modem" USB mode which from what I understand should be diag mode, what I'm looking for, but Windows( All: 7, XP, 32, 64 ) can't find drivers for it. It's showing up as 7 CDCs.
Anyone have any suggestions or knows what "7 CDCs" is and how do I get to an actual working diag mode from that ?
I dialed *#7284#, got this :
i.imgur.com/5W2HSlN.jpg

for drivers, usually you can dowload heimdall and go to 'zadig' (or something similar), with device in download mode: double click zadig.exe it will install drivers
you should see at least one CDC driver possibly a modem driver as well.
Alternatively another good way to install drivers for me has been PDAnet by june fabrics.
find it download .apk it pretty well walks you through set-up.
Thats the right screen for setting usb to modem, etc..
I've had 2 backup's of my EFS folder since day one.

chrisrotolo said:
for drivers, usually you can dowload heimdall and go to 'zadig' (or something similar), with device in download mode: double click zadig.exe it will install drivers
you should see at least one CDC driver possibly a modem driver as well.
Alternatively another good way to install drivers for me has been PDAnet by june fabrics.
find it download .apk it pretty well walks you through set-up.
Thats the right screen for setting usb to modem, etc..
I've had 2 backup's of my EFS folder since day one.
Click to expand...
Click to collapse
Thanks for the suggestions, but I couldn't get them to work. PDAnet requires that the device be put in regular-ADB mode to install drivers - and does install 'normal' drivers but doesn't install the diag mode drivers. zadig installs a driver for the 7 CDCs device but It's listed as a USB device, not as a COM serial port as required by the application.
chrisrotolo said:
I've had 2 backup's of my EFS folder since day one.
Click to expand...
Click to collapse
Do you really need the extra one or can I have it ? :silly:

Still no success so far.
The only possibility I see Is doing a restore using NsPro, which apparently is the only software that supports the T869.
NsPro v6.5.2 released:
-Added I547, T869, T879 support.
Anybody knows how I can try to fix the tab with NSPro without buying the box + 1 year activation ?

Yeah send it to someone who has one...
Have you contacted mobiletechvideos.com yet? They are US based, but one of the best for these types of things..

chrisrotolo said:
Yeah send it to someone who has one...
Have you contacted mobiletechvideos.com yet? They are US based, but one of the best for these types of things..
Click to expand...
Click to collapse
Thanks, didn't know about them. It seems that they require that the device be shipped.
Has anybody dealt with them before ? How reliable are they / where are they located ?

How to fix LG G2 with IMEI issue

Long story short, I bricked my lg g2 d801 after flashing twrp recovery and trying to flash custom rom. The phone would restart randomly. I had no connection and the signal bars crosses out in red. In settings most of my info like baseband, imei etc were missing. I was looking up and many people bricked their phones with no EFS backup to restore the IMEI. This is how I fixed my phone. This should also help people who have zeroed out IMEI after bad flash or whatever reason. But you should at least have IMEI number ready (from your box/ receipt or call t-mobile)
1. Flashed the phone to factory firmware using LG support tool. I used the following guide:
http://androidcure.com/unbrick-lg-g2-stock-firmware/
used the firmware: T-Mobile KitKat D80120A_00.kdz
there's also similar guides in xda, follow whichever you prefer. Goal is to revert the phone back to stock.
After flashing the phone, the phone was woking; however imei was null. In phone settings my IMEI was 0. To fix the null/bad imei follow this guide (Not all the steps are my work; this guide helped me http://forum.xda-developers.com/showthread.php?t=1942417 , also watched some you tube videos):
2. You need the following drivers and software:
LGUnitedMobileDriver_S50MAN310AP22_ML_WHQL_Ver_3.10.1
QPST_2.7_378
imei converter: http://www.sendspace.com/file/a3spfh
3. After installing the driver; turn on USB debugging and connect the phone to computer
4. Install QPST, run QPST configuration from from start menu
5. Click on Ports tab. Click Add new port. Your phone should be COM4/5. It will say USB after the port. Select the port and click OK.
6. The port should come up on active phones. Select the phone and and click on "Software Download" from start clients menu
7. Click on Backup tab. Your port should appear. Backup by clicking on start
8. Now go to Program Files/qualcomm/qpst/bin folder
9. Run RF_NV_Manager program
10. Click File read from phone. Your IMEI should appear on number 550; NV_UE_IMEI_I
11. In my case; there was no item 550 as my IMEI was missing. Don't worry.
12. Click on file> Read supported RF NV items
13. Now click on item 550. It should show 9 blank fields.
14. Start IMEI converter. Type in your IMEI in enter IMEI click on convert IMEI
15. There will be 18 digits in groups of 9
18. In RF_NV_Manager program; click on Hex by Write NV button
19. IN the 9 boxes; type in the numbers from IMEI converter starting from left. Type in first group of two numbers in the first field, then go to the next field and type in second 2 digits
20. After you fill in; click on write NV
21. Now click on File> Read from phone. NV item number 550 should appear now.
22. Unplug, Restart your phone and your IMEI number should be there and phone should connect to network.
Above process fixed my phone with full 4G LTE data. Now depending on the how bad your EFS was damaged; you might not get 4G lte data. But at least now; you will be able to send the phone back to LG for repair or return to t-mobile as IMEI number will be in your phone.

You can do this with EFS Professional. It does all the conversion for you and you dont need QPST. Just simply type in IMEI and write to device.
Sent from my LG-D802 using Tapatalk

I've tried the this guide and it didn't work for me. I get an error when I try to write NV. The good news is that I don't have an immediate need to change/fix IMEI but I was wondering if it ever gets zeroed out I have a way to restore it. I will give your tool a try.

lyriquidperfection said:
You can do this with EFS Professional. It does all the conversion for you and you dont need QPST. Just simply type in IMEI and write to device.
Sent from my LG-D802 using Tapatalk
Click to expand...
Click to collapse
So the EFS Professional is compatible with phones other than Samsung? Once I've unzipped the file I see a bunch of binaries for Samsung phones, but nothing for LG G2. When I try to run it generates an error the app is for Samsung devices only... Where can I get a compatible binary for LG G2 or EFS professional that works with LG G2?
I've tried Qualcomm NV Tools instead of EFS Professional and I cannot create a backup. When backup is being created it errors out saying the device has been disconnected... Also if I write the IMEI it says it was accepted but it doesn't change.
PS: I should probably start screweing around with these apps since I may introduce the problem. My IMEI is fine.

tpaxadpom said:
So the EFS Professional is compatible with phones other than Samsung? Once I've unzipped the file I see a bunch of binaries for Samsung phones, but nothing for LG G2. When I try to run it generates an error the app is for Samsung devices only... Where can I get a compatible binary for LG G2 or EFS professional that works with LG G2?
I've tried Qualcomm NV Tools instead of EFS Professional and I cannot create a backup. When backup is being created it errors out saying the device has been disconnected... Also if I write the IMEI it says it was accepted but it doesn't change.
PS: I should probably start screweing around with these apps since I may introduce the problem. My IMEI is fine.
Click to expand...
Click to collapse
Imei will only write if zeroed out. You are correct, EFS Professional is for samsung devices but the Qualcomm NV Tools is universal. I am currently in the middle of updating it so more features can be used on other devices.
Sent from my LG-D802 using Tapatalk

lyriquidperfection said:
Imei will only write if zeroed out. You are correct, EFS Professional is for samsung devices but the Qualcomm NV Tools is universal. I am currently in the middle of updating it so more features can be used on other devices.
Sent from my LG-D802 using Tapatalk
Click to expand...
Click to collapse
got it. Thank you.

Ey guys , im new in this foro. Sorry but my english.....i have a LG D802 , the imei said unkown ....I tried the method in this post but always obtain error when i use RF_NV_Manager , when i trie to read files from phone give me an error...the phone bricked when install a new custom rom.
Help please.....

the driver is correctly and the program detect the phone in port 26...

the error is this....

kamaleonico said:
the error is this....
Click to expand...
Click to collapse
did you try restoring the the phone with flash tool first?..

thank you so much, just did it and it worked perfectly fine !

kingroach said:
Long story short, I bricked my lg g2 d801 after flashing twrp recovery and trying to flash custom rom. The phone would restart randomly. I had no connection and the signal bars crosses out in red. In settings most of my info like baseband, imei etc were missing. I was looking up and many people bricked their phones with no EFS backup to restore the IMEI. This is how I fixed my phone. This should also help people who have zeroed out IMEI after bad flash or whatever reason. But you should at least have IMEI number ready (from your box/ receipt or call t-mobile)
1. Flashed the phone to factory firmware using LG support tool. I used the following guide:
http://androidcure.com/unbrick-lg-g2-stock-firmware/
used the firmware: T-Mobile KitKat D80120A_00.kdz
there's also similar guides in xda, follow whichever you prefer. Goal is to revert the phone back to stock.
After flashing the phone, the phone was woking; however imei was null. In phone settings my IMEI was 0. To fix the null/bad imei follow this guide (Not all the steps are my work; this guide helped me http://forum.xda-developers.com/showthread.php?t=1942417 , also watched some you tube videos):
2. You need the following drivers and software:
LGUnitedMobileDriver_S50MAN310AP22_ML_WHQL_Ver_3.10.1
QPST_2.7_378
imei converter: http://www.sendspace.com/file/a3spfh
3. After installing the driver; turn on USB debugging and connect the phone to computer
4. Install QPST, run QPST configuration from from start menu
5. Click on Ports tab. Click Add new port. Your phone should be COM4/5. It will say USB after the port. Select the port and click OK.
6. The port should come up on active phones. Select the phone and and click on "Software Download" from start clients menu
7. Click on Backup tab. Your port should appear. Backup by clicking on start
8. Now go to Program Files/qualcomm/qpst/bin folder
9. Run RF_NV_Manager program
10. Click File read from phone. Your IMEI should appear on number 550; NV_UE_IMEI_I
11. In my case; there was no item 550 as my IMEI was missing. Don't worry.
12. Click on file> Read supported RF NV items
13. Now click on item 550. It should show 9 blank fields.
14. Start IMEI converter. Type in your IMEI in enter IMEI click on convert IMEI
15. There will be 18 digits in groups of 9
18. In RF_NV_Manager program; click on Hex by Write NV button
19. IN the 9 boxes; type in the numbers from IMEI converter starting from left. Type in first group of two numbers in the first field, then go to the next field and type in second 2 digits
20. After you fill in; click on write NV
21. Now click on File> Read from phone. NV item number 550 should appear now.
22. Unplug, Restart your phone and your IMEI number should be there and phone should connect to network.
Above process fixed my phone with full 4G LTE data. Now depending on the how bad your EFS was damaged; you might not get 4G lte data. But at least now; you will be able to send the phone back to LG for repair or return to t-mobile as IMEI number will be in your phone.
Click to expand...
Click to collapse
Hey kingroach, amazing guide, wonderful!
I followed everything step by step. Right now I have some generic IMEI which does not work, I'm trying to write my original one back, but at step 20, when I click "Write NV", the numbers change, the Hex unchecks and the popup comes out. When I close it, Hex goes back to being checked and numbers return to what I made them. and I get this popup:
Here's a video.
lyriquidperfection said:
You can do this with EFS Professional. It does all the conversion for you and you dont need QPST. Just simply type in IMEI and write to device.
Sent from my LG-D802 using Tapatalk
Click to expand...
Click to collapse
Hi, thank you for your help too in these threads. I tried EFS Pro, everything checks out, it says IMEI written, but when phone is restarted, nothing has changed. Do you know if EFS Pro need some other setting enabled to actually change the IMEI?

Try deleting 550 nv item which contains the imei and save. Restart the phone and add it.

kingroach said:
Try deleting 550 nv item which contains the imei and save. Restart the phone and add it.
Click to expand...
Click to collapse
nope, it dont work
im genuinly surprised the procedure works for lg g2 and not for nexus 5

how did you delete item 550?

asterix005 said:
how did you delete item 550?
Click to expand...
Click to collapse
I couldn't - you try with the custom list, under tools I think. You move item 550 from the right column, and it dissappears, but when I read NV phone items, its there. It's untouchable I tell you!:silly:

kingroach said:
Long story short, I bricked my lg g2 d801 after flashing twrp recovery and trying to flash custom rom. The phone would restart randomly. I had no connection and the signal bars crosses out in red. In settings most of my info like baseband, imei etc were missing. I was looking up and many people bricked their phones with no EFS backup to restore the IMEI. This is how I fixed my phone. This should also help people who have zeroed out IMEI after bad flash or whatever reason. But you should at least have IMEI number ready (from your box/ receipt or call t-mobile)
1. Flashed the phone to factory firmware using LG support tool. I used the following guide:
http://androidcure.com/unbrick-lg-g2-stock-firmware/
used the firmware: T-Mobile KitKat D80120A_00.kdz
there's also similar guides in xda, follow whichever you prefer. Goal is to revert the phone back to stock.
After flashing the phone, the phone was woking; however imei was null. In phone settings my IMEI was 0. To fix the null/bad imei follow this guide (Not all the steps are my work; this guide helped me http://forum.xda-developers.com/showthread.php?t=1942417 , also watched some you tube videos):
2. You need the following drivers and software:
LGUnitedMobileDriver_S50MAN310AP22_ML_WHQL_Ver_3.10.1
QPST_2.7_378
imei converter: http://www.sendspace.com/file/a3spfh
3. After installing the driver; turn on USB debugging and connect the phone to computer
4. Install QPST, run QPST configuration from from start menu
5. Click on Ports tab. Click Add new port. Your phone should be COM4/5. It will say USB after the port. Select the port and click OK.
6. The port should come up on active phones. Select the phone and and click on "Software Download" from start clients menu
7. Click on Backup tab. Your port should appear. Backup by clicking on start
8. Now go to Program Files/qualcomm/qpst/bin folder
9. Run RF_NV_Manager program
10. Click File read from phone. Your IMEI should appear on number 550; NV_UE_IMEI_I
11. In my case; there was no item 550 as my IMEI was missing. Don't worry.
12. Click on file> Read supported RF NV items
13. Now click on item 550. It should show 9 blank fields.
14. Start IMEI converter. Type in your IMEI in enter IMEI click on convert IMEI
15. There will be 18 digits in groups of 9
18. In RF_NV_Manager program; click on Hex by Write NV button
19. IN the 9 boxes; type in the numbers from IMEI converter starting from left. Type in first group of two numbers in the first field, then go to the next field and type in second 2 digits
20. After you fill in; click on write NV
21. Now click on File> Read from phone. NV item number 550 should appear now.
22. Unplug, Restart your phone and your IMEI number should be there and phone should connect to network.
Above process fixed my phone with full 4G LTE data. Now depending on the how bad your EFS was damaged; you might not get 4G lte data. But at least now; you will be able to send the phone back to LG for repair or return to t-mobile as IMEI number will be in your phone.
Click to expand...
Click to collapse
i tried. but at step 5, my my PC said "No Phone". can you help me ????

I keep getting
Exception Thrown!!
NvManager::getNvItemsFromPhone( const string comport )-
QpstServer::sendSyncImpl - Bad response from phone (DM packet
commands 19-24)
Any ideas? Please tag me in this.

Did you first reflash the stock rom? Someone was getting similar error and flashing stock rom fixed it.

Use EFS Professional to write your Original IMEI ....

My imei is 00000000!! Sm-G355H

sir after flashing some roms i lost my imei and i have only efs folder with no files inside pls help me. Pls!!!!
Can somebody give me the backup efs for sm-g355h dual sim

jobert.core2 said:
sir after flashing some roms i lost my imei and i have only efs folder with no files inside pls help me. Pls!!!!
Click to expand...
Click to collapse
Read the PM and will help U and guide you.
Regards
After that you can decide if U want to post this guide, I can change the IMEI and other stuff.
The certificate thing will be more hard to acchieve - Will have to use the Z3S toolbox.
If any 1 can help you and give you the mmcblk0p14 ( EFS ) recovery backup of G355H that will be a starter.
No infos will be used or shared.
Yust need a working backup of EFS ( In recovery or just plain copy/cat of /dev/block/mmcblk0p14 If any1 can help you
-->You will have to give me your IMEI and S/N. They are located at the back of the battery inside phone ( please use PM ! )
-->Then I need your CSC code ( contents of 3 leters in /system/csc/sales_code.dat ).
--> MSL will have to be bypassed
I will make a init changes and create a starting working EFS backup, then it's up to you if U want to fix EFS it with Z3S toolbox, as told GC2 phones are supported.
I will make all the necessary needed changes.
Something to read : http://forum.gsmhosting.com/vbb/f453/samsung-core2-g355h-imei-repair-done-1865101/
Regards

@StratOS_HTC
If u were referring to imei sertification signature I just compare it with 2 gc2 phones. Its same. WiFi Mac address could be found at box that came with phone and Bluetooth Mac address is last digit or character - 1 (eg. Wifi 4 or C - Bluetooth 3 or B)
msl code could be calculated but when I open file msl_code as text I don't know in what format is it or how to decode it. Also when I compared msl_addr with other gc2 it was different and in strange format.

EFS
Y300-0100 said:
@StratOS_HTC
If u were referring to imei sertification signature I just compare it with 2 gc2 phones. Its same. WiFi Mac address could be found at box that came with phone and Bluetooth Mac address is last digit or character - 1 (eg. Wifi 4 or C - Bluetooth 3 or B)
msl code could be calculated but when I open file msl_code as text I don't know in what format is it or how to decode it. Also when I compared msl_addr with other gc2 it was different and in strange format.
Click to expand...
Click to collapse
@Y300-0100
What U said it's all true.
Did research with our Phones, have sucessfully fixed 2 phones G355HN ( without any software or box ! ) for EFS removal
Mine EFS backup/restore via ADB
Source : http://forum.xda-developers.com/showpost.php?p=59986186&postcount=129
MSL is the key, have a way of bypassing MSL Check. msl_addr and msl_code is indeed in strange encoded format, but if u bypass it there is a way it can load radio without check and use the network.
Not so sure about certs imei_certification1,imei_certificationsignature1,imei_signature1,imeino1 have a check I guess, so does the z3x devs say. For now on G355HN I havent have any probs, have made working radio with same IMEI/SN, luck ? Donnno , have to test it further.
It's mine error, I don't have those 2 Gc2's I repeared it. Deleted the EFS backups after successfull repair Were too happy about it ...
Have u compared 2 different models of GC2 ? G355xy ?

@StratOS_HTC
U were right I check first 2 imei files but imei_signature1
Is different. I got 2 g355hn phones.
This is why I added efs backup in recovery as important
Edit..
About msl code. I Google it and its mentioned only for CDMA phones not for wcdma so it could be some strange leftover as we encounter before with our phone.
Edit.
I was right. I just deleted msl code and address and reboot phone and 2/3g, call works.

Y300-0100 said:
@StratOS_HTC
U were right I check first 2 imei files but imei_signature1
Is different. I got 2 g355hn phones.
This is why I added efs backup in recovery as important
Edit..
About msl code. I Google it and its mentioned only for CDMA phones not for wcdma so it could be some strange leftover as we encounter before with our phone.
Edit.
I was right. I just deleted msl code and address and reboot phone and 2/3g, call works.
Click to expand...
Click to collapse
Nice to hear some feedback ... Good one specially. MSL/SPC is a leftower for android CDMA ...
I found out that the factorymode is also one good starting point to get ppl pissed off ...
There is also a good number of other checks here in EFS ... don't want to talk about it.. it's obvious ( /FactoryApp/)
Have U found any diffs regarding hist_nv,test_nv,prodcode in same subdir ?
Regards

StratOS_HTC said:
Nice to hear some feedback ... Good one specially. MSL/SPC is a leftower for android CDMA ...
I found out that the factorymode is also one good starting point to get ppl pissed off ...
There is also a good number of other checks here in EFS ... don't want to talk about it.. it's obvious ( /FactoryApp/)
Have U found any diffs regarding hist_nv,test_nv,prodcode in same subdir ?
Regards
Click to expand...
Click to collapse
Only difference is product code. White model G355HZWNSEE . Black G355HZKNSEE

Y300-0100 said:
Only difference is product code. White model G355HZWNSEE . Black G355HZKNSEE
Click to expand...
Click to collapse
SEE version
@jobert.core2
Edit #1 post, u have Dual Sim GC2 SM-G355H
Sincu U have dual I'll be needing backup of mmcblk0p14 / EFS backup to continue work on restore your EFS.
Edit 1st post and ask if any1 can give you backup of EFS for SM-G355H dual sim.
Regards, only then I could help, to do something on my own, specialy for dual sim is waist of time.
Will check if I could find any on internet.
Regards.

I have same problem with my Samsung galaxy core 2 g355h
I need help for fix this problem please help guys
Sent from my SM-G355H using XDA Free mobile app

EFS
yhadi123 said:
I have same problem with my Samsung galaxy core 2 g355h
I need help for fix this problem please help guys
Sent from my SM-G355H using XDA Free mobile app
Click to expand...
Click to collapse
Please do not spam in between threads with different goal.
Use this thread instead.
First of all EFS is strictly personal informations and it's kinda binded with operator and OEM info ( like IMEI number/s, Serial no ...
There are a lot of interesting post here in xda and google.
http://www.gsmtwo.com/samsung-core2-g355h-imei-repair-done-box-z3x-to-do-this-hardware-problem/
If U want to use your current network preferencess,cell number and current network data access and your phone you will have to fix your current EFS.
First you may politely ask some user if they can provide/help you with EFS backup of your exact model of phone.
Second you'll need IMEI1/IMEI2 number and serial no to restore your EFS config. Those infos are on the back of the battery on the phone.
Second if U have luck with it you will be rewarded, but for now your current phone is out of order with any sim card !
And third try to explain what have you done with your phone to change/erase EFS in detail.
The rest is up to U ...
First of all try backup and provide me with your current EFS backup. Hope your phone is rooted.
Check http://forum.xda-developers.com/galaxy-core/help/efs-backup-g355hn-t3113918
Regards

Flash the efs backup any sensible person makes
SENT BY ENTANGLEMENT

StratOS_HTC said:
@Y300-0100
What U said it's all true.
Did research with our Phones, have sucessfully fixed 2 phones G355HN ( without any software or box ! ) for EFS removal
Mine EFS backup/restore via ADB
Source : http://forum.xda-developers.com/showpost.php?p=59986186&postcount=129
MSL is the key, have a way of bypassing MSL Check. msl_addr and msl_code is indeed in strange encoded format, but if u bypass it there is a way it can load radio without check and use the network.
Not so sure about certs imei_certification1,imei_certificationsignature1,imei_signature1,imeino1 have a check I guess, so does the z3x devs say. For now on G355HN I havent have any probs, have made working radio with same IMEI/SN, luck ? Donnno , have to test it further.
It's mine error, I don't have those 2 Gc2's I repeared it. Deleted the EFS backups after successfull repair Were too happy about it ...
Have u compared 2 different models of GC2 ? G355xy ?
Click to expand...
Click to collapse
Hello Bro same here with me it's 8 month ago flash a custom rom after I'm searching about solution but still nothing if you have any idea how to repair core 2 G355H imei than for god sake please help me .... my imei 00000000000/01 no call no sms emergency call only ?
---------- Post added at 07:50 PM ---------- Previous post was at 07:46 PM ----------
Y300-0100 said:
@StratOS_HTC
U were right I check first 2 imei files but imei_signature1
Is different. I got 2 g355hn phones.
This is why I added efs backup in recovery as important
Edit..
About msl code. I Google it and its mentioned only for CDMA phones not for wcdma so it could be some strange leftover as we encounter befyore with our phone.
Edit.
I was right. I just deleted msl code and address and reboot phone and 2/3g, call works.
Click to expand...
Click to collapse
I did flash a custom rom on G355H core 2 after that my imei is 000000000/01 of both sims can't make call or sms only emergency call ??? Please help me

S6 SM-G920F Is It Possible To Change Imei Without Box?

Phone was previously locked by ee,so i did tons of things,i think i damaged efs/imei(i don't have any backup)
Flashed several stock/custom firmware/roms
Now Not registered On network is constant
Imei is 3500000000000000006 something like that
Is it possible to rewrite change or whatever is needeed to be able to register on network without box?
(I've played with pit files,certs but without any knowledge,everything is working fine except network)
Thanks

1 install root
2 install xposed installer
3 install busybox pro
4 install device id changer pro 1.5.1 app (activate it on xposed installer)
5 restart phone
6 change imei with device id changer 1.5.1 pro app
7 restart
8 check imei dial *#06#
9 if the app didnt work use ( imei changer pro 1.2 app ) but dont unistall device id changer..
10 chnahe imei with imei changer pro 1.2 app
11 restart

tazaga said:
1 install root
2 install xposed installer
3 install busybox pro
4 install device id changer pro 1.5.1 app (activate it on xposed installer)
5 restart phone
6 change imei with device id changer 1.5.1 pro app
7 restart
8 check imei dial *#06#
9 if the app didnt work use ( imei changer pro 1.2 app ) but dont unistall device id changer..
10 chnahe imei with imei changer pro 1.2 app
11 restart
Click to expand...
Click to collapse
thanks,i was able to change imei,but still can't register on network?any possible solutions?

Go to
Settings/Mobile networks/Network operators/Search networks
And choose your network
If didnt work try to flash your mobile with latest Rom using (smart switch) keep in mind you will lose all data on your phone if didnt work try Marshmalow beta....any way try roms and do same steps...

tazaga said:
Go to
Settings/Mobile networks/Network operators/Search networks
And choose your network
If didnt work try to flash your mobile with latest Rom using (smart switch) keep in mind you will lose all data on your phone if didnt work try Marshmalow beta....any way try roms and do same steps...
Click to expand...
Click to collapse
choosing network doesnot help,it's unable to register,im trying several different firmware roms

NKRGS said:
choosing network doesnot help,it's unable to register,im trying several different firmware roms
Click to expand...
Click to collapse
Last hope try to restore back efs folder with twrp recovery
Download it link below
Restore it with twrp recovery
Set imei back with apps inside folder
If didnt work take it to repaire to replace imei certificat with octoplus box or z3x pro box only 10 bucks or 20 you will not get original imei but you will be able to register then set back original imei with apps inside folder
Look you can find the download link
http://forum.xda-developers.com/galaxy-s6/help/g920f-network-issues-t3291903/page3

tazaga said:
Last hope try to restore back efs folder with twrp recovery
Download it link below
Restore it with twrp recovery
Set imei back with apps inside folder
If didnt work take it to repaire to replace imei certificat with octoplus box or z3x pro box only 10 bucks or 20 you will not get original imei but you will be able to register then set back original imei with apps inside folder
Look you can find the download link
http://forum.xda-developers.com/galaxy-s6/help/g920f-network-issues-t3291903/page3
Click to expand...
Click to collapse
i can change imei easily with your instructions provided,but serial number? ( it works for me i can change my imei to whatever i want to....S/N is easy only modify serial_no file inside \efs\FactoryApp ) <<<<could you explain this? my emei seems to be finally corrupted so only way to get it back is write in id changer manually,so do i need to backup and restore it anyway?

Dude just restore this efs backup with twrp recovery https://www.mediafire.com/?loh80547x1k5cg8
It will say null or something then try to fix imei with apps inside folder...if this didnt work visit repair place...

Sincerely hope you're not in the UK as it's very illegal here to change IMEI and advertising the fact isn't a smart move.

Greetings,
Changing IMEI is illegal in many countries and the discussion thereof is prohibited on XDA.
Thread closed.