Database Develop

[Q] Network + imei problem after Darky 9.5 ! HEEEEELP

Hello
For a week I have no resale (my card works on another phone)
I look long on the side of APN and did a factory reset and flash JM5 JS5
Nothing worked
So I decide to check my IMEI
When I type * # 06 #
There EMEI writing and my number is not displayed (just ok)
When I type * # 1234 # phone and I like the basic version: unknow
I have therefore concluded that the problem comes from the EFS folder
So I tried to restore my file with efs previous backups: this not work (I used root and explore the toolbox and the Galaxy App Unlock)
I have, there are three months, unlocked for SGS
I looked in / efs / .imei> I have the correct imei
In / efs / imei / mps_code.dat> SER
My sim card is not recognized
Someone you it would be a solution or idea?
In advance thank you
Help me!
Cordially
Julien

up please !

In English fail to understand actual problem .
jje

I also have some difficulties to understand the problem. Presumably 3G data connection isn't working? Double check your APN settings (remove old and make new) and try enabling "Data roaming"..
Was it working previously? And you have correct modem for your region etc etc..give little more information so it's easier to help.

My english is very bad. sorry
I will try to translate without google ^^"
My problem is :
-my simcard is not detected > no network (phone sms EDGE 3g 3g+ ...)
-I have no IMEI when I type *#06# in phone > My IMEI number is not display (just ok display)
-in settings > Information > version bande de base > unknow
-when I type *#1234* > phone display unknow
-my apn are correct (verified with samfirmware and official site of telephone operator)
Before I didn't have this problem : the problem appear during a night (i just charge the phone) > in darky 9.5, dark voodoo, lagfix ON
I try to do a hard reset and jm5 flash (with repartition) and restore my efs folder for try to resolve the problem but didn't work
Please help me
If you want more details > just ask
I advance I thank you
Cordially
Julien

i'm having the same issue, I have tried reinstalling the software as other posts suggested but I could not resolve the issue, The airplane mode won't go away.

I am not alone. What rom you try before have this bug?
Sent from my GT-I9000 using Tapatalk

Looks like you install a Darky rom then got problems so you should ask darky .
Undo Lagfix .
Flash to a stock rom via Odin with pit 512 and repartition checked .
jje

I send a message to darky in xda dev
I will post his reponse when I receive it
Be patient

We will speak with Gtalk

Any word from Darky cause I got the same problem would like to know if there is a solution for this.

In about phone whats your baseband version? If it says unknown you hard a radio issue, can flash one in heimdall or just reflash a stock ROM and see if that fixes it
Sent from my GT-I9000 using XDA App

I try a lot of ROM samsung
I speak with Darky> no ideas
I post on Darkyrom.com

Do you have an efs backup with the good imei ? If you have , flash another odin rom like EZROM with repartition , than install root explorer or other stuff and replace the efs with the correct one .

Had a similar problem installed Darky 9.5 from 2.1 and everything was fine but as soon as i activate voodoo lagfix my imei changes to unknown turn it off and everything is fine again

No network avaiable after factory reset

my phone is international version (Euro verion), after I unlock, i factory reset and then my phone can't text sms, call. Plz help me! thanks a lots

tuteary Vtd said:
my phone is international version (Euro verion), after I unlock, i factory reset and then my phone can't text sms, call. Plz help me! thanks a lots
Click to expand...
Click to collapse
Have you checked your APN settings?

MrIwik said:
Have you checked your APN settings?
Click to expand...
Click to collapse
Have u mean Access Point Names?
My phone has no service

tuteary Vtd said:
my phone is international version (Euro verion), after I unlock, i factory reset and then my phone can't text sms, call. Plz help me! thanks a lots
Click to expand...
Click to collapse
u seem to have corrupted ur modem file.. flash te below link via cwm or use odin..
http://db.tt/sMvERqL
Dont forget to hit thanks!

doomsdaycs said:
u seem to have corrupted ur modem file.. flash te below link via cwm or use odin..
Dont forget to hit thanks!
Click to expand...
Click to collapse
i can't download your link, can u give me another link?

thanks all, i have sloved my problem. I also want to share my solution . I took uproom and hard reset hope if someone face to the same my problem, they can read my post hii

I've got the similar problem. My phone says "please put the sim card into the phone". This happened after I flashed Juwes 5.1 custom rom. My IMEI was corrupted after flashing, then I managed to restore it after I edited the nv_data.bin. Now I have an IMEI number, but the phone cannot recognize any simcard.
Reflashing to the stock rom with Odin doesn't help. I've already tried XXJVQ, now I've got XWJVI. Neither hard reset nor flight mode helps. I've already tried to delete nv_data.bin and nv_data.bin.md5 and reboot, but result is still the same. I cannot find any tipps for solution. Have you got an idea what could I try?
Here some information on my phone:
german version, not branded
*#06# shows the right IMEI
*2767*4387264636#:
Sellout SMS Off
Pcode: GT-I9000HKYDBT
Mode: Prod
*#1234#:
PDA I9000XWJVI
Phone I9000XXJVO
CSC I9000DBTJV2
everything seems to bi OK but it doesn't work. I have already found a topic in your forum about SIM initilializing bug, and somebody suggested to flash the following ROM:
(Rom) I9000 Hybrid / No TouchWiz *9/7/2010* for I9000
but its no longer available. EFS backup doesn't exist, as I deleted it some days before That was a big mistake.
Now I have to stay without my phone over the weekend

robis77 said:
I've got the similar problem. My phone says "please put the sim card into the phone". This happened after I flashed Juwes 5.1 custom rom. My IMEI was corrupted after flashing, then I managed to restore it after I edited the nv_data.bin. Now I have an IMEI number, but the phone cannot recognize any simcard.
Reflashing to the stock rom with Odin doesn't help. I've already tried XXJVQ, now I've got XWJVI. Neither hard reset nor flight mode helps. I've already tried to delete nv_data.bin and nv_data.bin.md5 and reboot, but result is still the same. I cannot find any tipps for solution. Have you got an idea what could I try?
Here some information on my phone:
german version, not branded
*#06# shows the right IMEI
*2767*4387264636#:
Sellout SMS Off
Pcode: GT-I9000HKYDBT
Mode: Prod
*#1234#:
PDA I9000XWJVI
Phone I9000XXJVO
CSC I9000DBTJV2
everything seems to bi OK but it doesn't work. I have already found a topic in your forum about SIM initilializing bug, and somebody suggested to flash the following ROM:
(Rom) I9000 Hybrid / No TouchWiz *9/7/2010* for I9000
but its no longer available. EFS backup doesn't exist, as I deleted it some days before That was a big mistake.
Now I have to stay without my phone over the weekend
Click to expand...
Click to collapse
Hi,
There was no need for you to flash to stock ROM after installing Juwe's ROM 5.1. I am currently on the same ROM and faced the same problem. All i did was flash the JVQ modem via odin and my device recognized the SIM card. Hope this helps.

Thanks for your reply. as I'm now on stock rom, I've already flashed the stock JVI with phone and csc over ODIN. But this didn't solve the problem.

The problem is solved, After restoring my IMEI I was stupid enough, to put the sim the wrong way into the phone Now its working. Thank you guys.

hi tuteary Vtd, what do you mean by "uproom"?? i have the same problem, could you please give some more information about your solution?
thanks,
sami

[Q] GT-I9305 IMEI Null / Null

Hello,
A friend bring me his S3 LTE, which doesn´t show IMEI.
*#06# shows - IMEI Null / Null
No EFS backup, no IMEI no sticker, but further I found the IMEI.
Already flashed latest version I9305XXBME3, still the same.
Already tried the param_bin file, flashed ok, but still no IMEI
[WARNING! + GUIDE] Backup and Restore IMEI / NV Data Procedure for GT-I9305 - xda-developers
Still no luck...
I can see the IMEI with "EFS professional" and i´m able to read IMEI and write IMEI. Says ok, but it´s not.
I need some help...
Thank you

Drug_Store said:
Hello,
A friend bring me his S3 LTE, which doesn´t show IMEI.
*#06# shows - IMEI Null / Null
No EFS backup, no IMEI no sticker, but further I found the IMEI.
Already flashed latest version I9305XXBME3, still the same.
Already tried the param_bin file, flashed ok, but still no IMEI
[WARNING! + GUIDE] Backup and Restore IMEI / NV Data Procedure for GT-I9305 - xda-developers
Still no luck...
I can see the IMEI with "EFS professional" and i´m able to read IMEI and write IMEI. Says ok, but it´s not.
I need some help...
Thank you
Click to expand...
Click to collapse
i have the same problem mate, and nothing help
on phone was custom firm and iam just go to official and now is not working (null null and unknow baseband)
did you resolve your problem ?
cheers

Just go snack to stock Rom and use persus kernel. It's a workaround for now
Sent from my GT-I9305 using xda app-developers app

winxuser said:
Just go snack to stock Rom and use persus kernel. It's a workaround for now
Sent from my GT-I9305 using xda app-developers app
Click to expand...
Click to collapse
Tried this few weeks ago, but no success.
I don´t have the unit in my possession anymore.
But tried all tips and tricks posted around the net. Maybe only with Z3X box, or at Samsung.

Drug_Store said:
Tried this few weeks ago, but no success.
I don´t have the unit in my possession anymore.
But tried all tips and tricks posted around the net. Maybe only with Z3X box, or at Samsung.
Click to expand...
Click to collapse
try this file is work for me
just flash the file via odin

Saw program for /EFS regeneration somewhere, will try to find it again

galaxy GT 9305
My imei says null. Have Tried restoring to factory settings and also using odin and the param file and flashed it using the odin methid but still nothing. Please tell me another way I can get back my imei step by step. Am desperate here

Schmirts said:
My imei says null. Have Tried restoring to factory settings and also using odin and the param file and flashed it using the odin methid but still nothing. Please tell me another way I can get back my imei step by step. Am desperate here
Click to expand...
Click to collapse
Your question has been posted multiple times . Forum rules require you to search before posting .
Google <<< I9300 your search terms > xda
Please ask in the existing threads .
Network IMEI EFS
http://forum.xda-developers.com/showthread.php?t=2393289

I have a problem???
Boot recovery
mouts and storange
format/system
format/data
format/preload
format/sdcard
format/extrermal sd
format/data and / data/media
Wipe cache, dalvic cache, wipe data/factory reset (not a must, but recommended)
Install zip from SD Card > choose zip
select rXTREME ROM version choice
Boot and have
Imei: null/ null
Base band Uknown
Boot recovery
I did restor
Imei: null/ null
Base band Uknown
Didin't hept
Install Param_Bin_I9305
Imei ok, baseband ok(XXBMD5), network ok I can call, but no DATA internet.
Connect KIES Update, after update baseband was changed (XXUEMK1)
Network ok I can call, but no DATA internet.
Wich baseband need use?
How it know?
Problem not basband?

Hey guys,
I've got a real noob issue with mine.
It came to me with null imei, and using the tools i have i was fairly sure i knew how to fix it and what was required, except the phone wouldnt take any of the box flashes i was trying to flash to it. It wouldnt take the imei_baseband fix at all. It just kept failing.
So, instead of trying 1 file md5 flash i thought i would try a FULL flash. However, apart from the CSC file i didnt know what order the files went in, so, instead of waiting and researching it, i just guessed. As you guessed it, the phone crapped out, and now i get the recovery error and it will only go to download mode.
These are the names of the files i got:
AP_I9305XXUEMKC_2051278_REV00_user_low_ship_tar.md5
BL_I9305XXUEMKC_2051278_REV00_user_low_ship_tar.md5 ( <--- i assumed this was boot file and left it alone)
CP_I9305XXUEMK1_REV06_CL1247969.tar.md5
THe other files were a CSC named file which i knew where it want and a pit file, which again i know where that goes, its just them 3 above....where do tehy need to go in Odin??
I'd really apprecaite your guys time on this.
Best Regards

STICKYS
http://forum.xda-developers.com/showthread.php?t=2344125
UNDERSTAND FIRST
http://forum.xda-developers.com/showthread.php?t=2362743
Network IMEI EFS
http://forum.xda-developers.com/showthread.php?t=2393289
Downgrade and network problems .
http://forum.xda-developers.com/showthread.php?t=2531221

Thankyou for them links - i do know that information already.
My question was, of the file names i have listed on the previous page what file goes where on Odin??
Ie, which one is 'phone' modem etc etc!!

mr_blonde said:
Thankyou for them links - i do know that information already.
My question was, of the file names i have listed on the previous page what file goes where on Odin??
Ie, which one is 'phone' modem etc etc!!
Click to expand...
Click to collapse
I9305XXUEMKC_I9305TENEMK1_I9305XXUEMK1_HOME.tar.md5
or
I9305XXUEMKC_I9305VD2EMK2_I9305XXUEMK1_HOME.tar.md5

mr_blonde said:
Thankyou for them links - i do know that information already.
My question was, of the file names i have listed on the previous page what file goes where on Odin??
Ie, which one is 'phone' modem etc etc!!
Click to expand...
Click to collapse
Its in the fff faqs and guides thats why i posted them .

JJEgan said:
Its in the fff faqs and guides thats why i posted them .
Click to expand...
Click to collapse
Hmm, well i have looked through all the faqs, and ive not come across anywhere where it says like AP file = PDA and CP file = Phone etc etc
Any chance please you can post the direct link here for me please?

JJEgan said:
Its in the fff faqs and guides thats why i posted them .
Click to expand...
Click to collapse
IMEI: ok.
I can do call, sms.
WiFi ok
BUT not working Mobile data.
GT-I9305
Baseband version
I9305XXUEMK1
Buil Munber
JSS15J.I9305XXUEMKC
How fix it?

thk
Hendra_sutanto said:
try this file is work for me
just flash the file via odin
Click to expand...
Click to collapse
thx a lot i am using this and it worked:good:

Insert sim card error - resolved
Hendra_sutanto said:
try this file is work for me
just flash the file via odin
Click to expand...
Click to collapse
Thanks a lot bro.. This worked for me... was in panic after I boot my S3 LTE. Since then it was not detecting the sim. But, flashing this file resolved it. Thanks again... :good:

Ok
help me

Drug_Store said:
Hello,
A friend bring me his S3 LTE, which doesn´t show IMEI.
*#06# shows - IMEI Null / Null
No EFS backup, no IMEI no sticker, but further I found the IMEI.
Already flashed latest version I9305XXBME3, still the same.
Already tried the param_bin file, flashed ok, but still no IMEI
[WARNING! + GUIDE] Backup and Restore IMEI / NV Data Procedure for GT-I9305 - xda-developers
Still no luck...
I can see the IMEI with "EFS professional" and i´m able to read IMEI and write IMEI. Says ok, but it´s not.
I need some help...
Thank you
Click to expand...
Click to collapse
The problem was not with the efs and you messed up ur phone more further by doing something else with efs

[Q] NO REGISTERING ON THE NETWORK NO SERVICE Galaxy s3 mini I8190n

Hello everyone. I bought a samsung galaxy s3 mini version nfc i8190n when lam bought the phone had a problem with GSM and HSDPA network. Do not want to register with any sim card network in any network. The phone has IMEI and modem good. When searching network manually, your phone finds them when I select a network does not register on the network. The phone came with android 4.1.2 baseband version i8190NXXALL6 Number
i8190NXXALL6 CSC: KOR. Before I get to work I saved the foders "efs" and "modemfs". For five days I struggle with it and we did and at the moment I'm stuck and ask for help.
Here are the steps that I did:
1. I changed csc from "kor" in "btu"
2. I rewrote the software with odin. Same i8190NXXALL6 Stock firmware samsung.
3. I installed CWM Recovery and I Flash all versions of this model,modem.
4. I installed custom ROMs, I returned to stock ROMs
5. I installed the stock recovery with odin and he appeared in DOWNLOAD MODE "custom binary download"=yes 2 times;"System Status"=custom;"current binary"=custom. I used the TriangleAWay and I brought "custom binary download=No. I8190NXXALL6 I reinstalled the stock rom via odin with repartition then full erease on the phone Cahe,Data,etc.and returned to" Custom Binay "= No Current Binay = Official Samsung, System status = Officia.Updates software and firmware from samsung works after many writings kind CWM unofficial ROMs, etc.
6. After each writing ROMs I rooted the phone and replaced the file "modemfs" nv.dat file. I downloaded from the XDA forum several files of other users Nv.dat i8190N this model, we have replaced each other and nothing.
7. I deleted all files in EFS folder and modemfs after deletion had baseband XXXXX. IMEI number has remained untouched.
8. I wrote modem manually via CWM recovery and nothing same problem.
I did have searched all the forum and other forums, I searched on google and do not know what to do. My phone is now rooted in the stock rom, stock kernel, stock recovery. These are details which are:
DEVICE INFORMATION FOR Samsung Galaxy S3 Mini
----------------------------------------------
Device Product Model: GT-I8190N
Firmware Build : 4.1.2
Firmware Build ID : JZO54K
Firmware Build PDA : I8190NXXAMJ2
Firmware Region Code: BTU
---------------------------------------------------
Waiting any kind of suggestion and let's solve this problem there are many people who have the same problem ......

You need this modem files
You need a file named NV.DAT, it's missing from your /modemfs/PERM/PROT
from: http://forum.xda-developers.com/showpost.php?p=42562414&postcount=19

pandu007 said:
You need a file named NV.DAT, it's missing from your /modemfs/PERM/PROT
from: http://forum.xda-developers.com/showpost.php?p=42562414&postcount=19
Click to expand...
Click to collapse
I replace before this file and nothing the same problem. Thanks for reply.

joker79 said:
Hello everyone. I bought a samsung galaxy s3 mini version nfc i8190n when lam bought the phone had a problem with GSM and HSDPA network. Do not want to register with any sim card network in any network. The phone has IMEI and modem good. When searching network manually, your phone finds them when I select a network does not register on the network. The phone came with android 4.1.2 baseband version i8190NXXALL6 Number
i8190NXXALL6 CSC: KOR. Before I get to work I saved the foders "efs" and "modemfs". For five days I struggle with it and we did and at the moment I'm stuck and ask for help.
Here are the steps that I did:
1. I changed csc from "kor" in "btu"
2. I rewrote the software with odin. Same i8190NXXALL6 Stock firmware samsung.
3. I installed CWM Recovery and I Fla**** all versions of this model modem.
4. I installed custom ROMs, I returned to stock ROMs
5. I installed the stock recovery with odin and he appeared in DOWNLOAD MODE "custom binary download"=yes 2 times;"System Status"=custom;"current binary"=custom. I used the TriangleAWay and I brought "custom binary download=No. I8190NXXALL6 I reinstalled the stock rom via odin with repartition then full erease on the phone Cahe,Data,etc.and returned to" Custom Binay "= No Current Binay = Official Samsung, System status = Officia.Updates software and firmware from samsung works after many writings kind CWM unofficial ROMs, etc.
6. After each writing ROMs I rooted the phone and replaced the file "modemfs" nv.dat file. I downloaded from the XDA forum several files of other users Nv.dat i8190N this model, we have replaced each other and nothing.
7. I deleted all files in EFS folder and modemfs after deletion had baseband XXXXX. IMEI number has remained untouched.
8. I wrote modem manually via CWM recovery and nothing same problem.
I did have searched all the forum and other forums, I searched on google and do not know what to do. My phone is now rooted in the stock rom, stock kernel, stock recovery. These are details which are:
DEVICE INFORMATION FOR Samsung Galaxy S3 Mini
----------------------------------------------
Device Product Model: GT-I8190N
Firmware Build : 4.1.2
Firmware Build ID : JZO54K
Firmware Build PDA : I8190NXXAMJ2
Firmware Region Code: BTU
---------------------------------------------------
Waiting any kind of suggestion and let's solve this problem there are many people who have the same problem ......
Click to expand...
Click to collapse
Er ask an samsung center bout it?

AssToast said:
Er ask an samsung center bout it?
Click to expand...
Click to collapse
No. The phone is fuul working, except no register in network, with out registering on the network i can`t do make calls receive calls sms e.t.c

joker79 said:
No. The phone is fuul working, except no register in network, with out registering on the network i can`t do make calls receive calls sms e.t.c
Click to expand...
Click to collapse
Yes i know but why would you purposely modify the modems and other stuffs, you should have brought it to your network provider service center or samsung and ask them about it, it could just be an SIM card problem

thanks for reply
AssToast said:
Yes i know but why would you purposely modify the modems and other stuffs, you should have brought it to your network provider service center or samsung and ask them about it, it could just be an SIM card problem
Click to expand...
Click to collapse
No. Is not sim problem issues becouse i test with a nother sim card`s of diferent carriers. Wen i put a nother sim card in apn setings are the setings for the carrier sim wat ai put,wen i cheange the sim with a nother carrier in the apn setings are the setings of the carrier sim card wat i m put. So for exemple i have 3 sim card`s of diferent carriers and all the sim`s card have pin security cod and the phone ask me for pin, after insert the pin code with all sim card`s don`t register on the netowork but the apn setings of the carrier automatic are there on the setings,so the phone see the sim card for all carriers, in setings wen a search manualy for the netorks the phone see the netowork wen i select the netowork manualy not register on the network,if i select automatic sey "registering on netowrk" but is not becouse if i want to call i can`t "not registering on network" sorry for my english ((

Try NV rebuild
joker79 said:
I replace before this file and nothing the same problem. Thanks for reply.
Click to expand...
Click to collapse
ok.. sorry about that. Find 'NV Rebuild' option from *#197328640# Service Mode and try rebuild it..

pandu007 said:
ok.. sorry about that. Find 'NV Rebuild' option from *#197328640# Service Mode and try rebuild it..
Click to expand...
Click to collapse
I do and this thing and nothing in service mode i rebuild the "NV" on *#0011# service mode info i have: gsm idle,hsdpa idle, service: limited. Here is the problem way the service is not aviable?

reflash efs
joker79 said:
I do and this thing and nothing in service mode i rebuild the "NV" on *#0011# service mode info i have: gsm idle,hsdpa idle, service: limited. Here is the problem way the service is not aviable?
Click to expand...
Click to collapse
hmm.. as the last solution - search "gsmhosting efs backup request" on google ( ai not able to paste external links here). You will find the backup efs folder from a working sgs3 mini i8190 phone. Flash it to your phone (first keep a backup of yopur own efs before doing this ... just in case)
all the best !

pandu007 said:
hmm.. as the last solution - search "gsmhosting efs backup request" on google ( ai not able to paste external links here). You will find the backup efs folder from a working sgs3 mini i8190 phone. Flash it to your phone (first keep a backup of yopur own efs before doing this ... just in case)
all the best !
Click to expand...
Click to collapse
I find but i need z3x box and i dont have thanks for the sugestion. I thing must be and another way.

joker79 said:
I find but i need z3x box and i dont have thanks for the sugestion. I thing must be and another way.
Click to expand...
Click to collapse
Were you able to resolve the problem? Please post solution for benefit of others.
:good:

I don`t have one
pandu007 said:
Were you able to resolve the problem? Please post solution for benefit of others.
:good:
Click to expand...
Click to collapse
My phone is bricked at this moment. Partition on the phone are mess up. One guy from the Mobile Phones Center brick the phone and my phone is in this stage righ now :http://forum.xda-developers.com/showthread.php?t=2657862 . Wen i have news and solution i post heare. Good day All.

I got the same problem with my phone, it just stopped registering on networks, tried any sim that was available in my country and nothing worked! If you find any solution please update!

Any updates???
Searched and searched... Had a good rooted stock rom, then tried something new a few days ago. I seem to have messed up the modem/bandband. Some issues as the original post. Re-flashed different roms, stock, rooted, unrooted, custom. Tried various different baseband updates. Everything works except being unable to register to the network. IMEI has not changed or been overwritten.
Any help would be gladly accepted.
i8190n

I have the exact same problem. I'm on Orange (EE). Yesterday morning my phone was registered on the network fine, I was in a poor signal area but still on 3G. Then I roamed across the south west of Britain and noticed my phone has no signal. It just wont register on any network, even EE. If I select automatic, it says it registers but it gets no signal and when I try to make a call. It says not registered on network!
The phone is totally stock. My sim works in another phone. I've done a factory reset but the problem still exists.
Was thinking about flashing the ROM but if others have been there too with no fix then I won't waste my time. I keep thinking EE have pushed something to my phone to block access as I'm out of contract by three months and they want me to upgrade!!

GT-9305t NOT REGISTERED ON NETWORK/CORRECT IMEI

HELLO EVERYONE.
i have a samsung i9305T i flashed it wth L.P rom then suddenly
my imei went 0049. i tried anything bUt no luck. so i decided to flash a stock one
4.1.2 my imei was back. But when i try to insert my network sim it says.
NOT REGISTERED ON NETWORK . tho ived used this phone before here in the philippines
so im sure it is unlocked.
any help guys.? thank you in advance does my baseband caused the issue?
please help ...

Hi,
I'm not an expert at all but i have a theory :
I think you get a corrupted EFS. You flashed L.P rom so the format of your EFS changed to V2. So when you tried to return to 4.1.2, the phone can't read your efs anymore.
I think the solution is to flash a newer baseband, for example the L.P baseband or a KK baseband.
Read more about efs format => http://forum.xda-developers.com/galaxy-s3/general/ref-imei-efs-stuff-i9300-including-t2393289
Hope it helps.