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[Completed] [Q] Unable to read NV data on Galaxy S2 after rooting

Hello All,
I am new to rooting phones and recently tried something on a galaxy S2. I had a korean version of S2 model SHW-250s which was locked. I lost my new phone so tried unlocking this myself...looked at some youtube videos some blogs and finally decided to use this method posted by someone:
1)Flash these two files using ODIN to convert the korean model into international version :
GTI9100_ext4.pit
9100XWLPW_I9100ODDLPC_I9100DDLPB_HOME.tar.md5 (stock ICS firmware for my country).
This successfully converted my phone to S2i9100.
2)Then to unlock I used a siyah kernel as posted by a developer :: Siyah-v3.2b8
This successfully installed SU and i checked using RootChecker apps that there is root access.
3)Then to unlock my phone i used GalaxSimUnlock app (did rooting as this app required root access)
This successfully unlocked my phone. I was able to call receive messages with new carrier.
I installed some more general apps used it for 5 days.
Sudddenly i started facing network issues. I was not able to make or receive calls. Strangely, I was getting data connection from network but not able to make or receive calls. I could not register on any network.
I tried running GalxSimUnlock app again and it said Unable to read NV data.Since I was naive i tried reinstalling the stock ROM and SIYAH kernel to see if it helps. It didnt.
When i researched further i came to know there's probably something wrong in the NV_data.bin file in EFS . But i hadnt taken backup of EFS previously. Now can anythng be done to restore the EFS and make the phone work? Please help me....
When i run GalaxSimUnlock app it shows everything in green except IMEI number which it blinks in red. But I am able to see a IMEI number and it doesnt look like something default. I am getting everything else MAC id, baseband version etc.
Thanks everybody...please forgive my language if not upto the mark as i am pretty naive about this stuff.

Please Review this thread [GUIDE] Recover your IMEI in 9 steps.
If you have specific question on the process, you can post this thread as well.
If that does not work and you need further help, please post in Galaxy S II Q&A, Help & Troubleshooting

Hey Buddy....Thanks for replying....i just saw you have written you flashed the original ROM on your device again...but as I wrote I have flashed another ROM and didnt take back up of original one and cannot find the SKT korea S2 ROm for this one...Is it ok if i employ the procedure told by you without flashing original ROM...what is CSC? Is there anything else you wanna tell me before i start the process? please forgive for my ignorance Im quite new to all this...

You will have to ask on the thread I linked regarding the Rom. You will have the right experts for your device there.
CSC is sales code., you can check your ROM CSC by dialling *#1234# . First two digits represents country and last three represents release time.

ok thanks...i will post the question there

Per Suggestion from my Collegue @It_ler,
The kernel you have is older. Latest SiyahKernel for the stock JB ROM he has on his device is SiyahKernel S2-v5.0.1.
If you have questions about the kernel, then use the [KERNEL][REF][Q&A] Siyah 5.0+[ICS/CM10] 6.0b5+[JB/CM10.1] +DISCUSSION+. NON-DEV!!! (SiyahKernel discussion) thread.

[Completed] how do i reclaim network coverage to my phone after rom modification?

hi guys. please help! i downloaded the lolipop 5.0.2 version and had an incompatible Google apps zip file. after i tried a couple times to reflash the phone i discovered that i had lost all network coverage! eventually i found google apps to work with the phone but still i have no network registered to my cell phone?
iv tried reupdating the software,tried reflashing many times, removed the sim card and still nothing.. please guys does anyone have the answer to this problem?
Thanks in advance

I would need to know which device you're talking about in order to direct you where to look

phone device
markbencze said:
I would need to know which device you're talking about in order to direct you where to look
Click to expand...
Click to collapse
Sorry. It is a Samsung s4mini type i9190

You can ask your question here. You will need to register in order to do so. Good luck

PLEASE HELP !! emegency calls only

hi there ive had my s6 for a little while now ,, running on giffgaff
all of a sudden its gone to emergency calls only wont register on any network ,,,
except voda and ee which dosnt help lol as I'm on giffgaff and more recently id network which runs on 3 ,,,

Factory reset!

further help
Indranuj Kar said:
Factory reset!
Click to expand...
Click to collapse
I have tried that already but in the mean time ive found out that o2 have blacklisted and the person I got it off as blocked me <<<<<typical <<<<< can I change the imei number at all

Well.. it seems like it's been stolen. Maybe not by You, but by the previous "owner". Try reflashing stock rom from sammobile using odin and if that doesn't work, contact o2 and maybe they will figure something out. If You got the box and papers they will most likely help You. And no, You can't change imei (even if it was, it would be illegal). So try odin and contact o2.
Also wrong place for that thread. There's helping section and this is general section.

Network not registered (samsung j7 sm-g610f)

Hello, i have been having a problem with my samsung mobile after i had flashed it with a new firmware. This was after it had stuck on samsung logo. When I flashed it it solved the problem but it brought about network not registered problem. Please could someone help me here, I will be greatful. I am running android 6.0.1 marshmallow
Thanks in advance.

Mrwaa said:
Hello, i have been having a problem with my samsung mobile after i had flashed it with a new firmware. This was after it had stuck on samsung logo. When I flashed it it solved the problem but it brought about network not registered problem. Please could someone help me here, I will be greatful. I am running android 6.0.1 marshmallow
Thanks in advance.
Click to expand...
Click to collapse
Verify whether your IMEI is still intact.
Go to:
system settings>about phone>status
or
system settings>about>status>information
or
system settings>about>information
Or whatever similar settings that you have, then check to see if your IMEI number is shown.
I DO NOT PROVIDE HELP IN PM, KEEP IT IN THE THREADS WHERE EVERYONE CAN SHARE

Thanks for your replies. Yes my IMEI is there but its not the same as it is on the back of the phone. However, the first time i flashed the stock ROM it was all the same but i still had this problem of Network not registered.

Mrwaa said:
Thanks for your replies. Yes my IMEI is there but its not the same as it is on the back of the phone. However, the first time i flashed the stock ROM it was all the same but i still had this problem of Network not registered.
Click to expand...
Click to collapse
Are you sure that you flashed the correct firmware for your specific model number?
Have you tried another SIM? If you had the SIM in when you flashed it, it might have damaged the SIM somehow. That might not be your issue but it's worth checking.
Maybe you have conflicting data from before you flashed it, in this case you can try bioting to recovery then factory reset and wipe cache then reboot.
I DO NOT PROVIDE HELP IN PM, KEEP IT IN THE THREADS WHERE EVERYONE CAN SHARE

Yes i used the exact firmware for my model as well for my country. I think i have done what you proposing already. And for trying a different SIM i did try it too. I am really helpless right now

Mrwaa said:
Yes i used the exact firmware for my model as well for my country. I think i have done what you proposing already. And for trying a different SIM i did try it too. I am really helpless right now
Click to expand...
Click to collapse
hi guys, did you find any solution? I have a sm-g610m, i boughted yesterday, flashed a stock rom, and now every time i need to make a call the message "Not registered to network" appears....

Hi guys I unrooted my sm-g610f then started getting not registered on network .I've tried many ways to deal with it even rooted it again the used z3x Samsung pro tool but it's still the same .I uprooted then updated the software to android 8.1.0 still the same issue..my security patch is 1 Feb 2019 ..IMEI is not the same as the one on the back please help

S7 Not registered on network issue

So I recently bought an S7 and was happy with it, until I got hit with an FRP lock that wouldn't let me boot. So I flashed the stock ROM from sammobile, this fixed the boot problem but now I can't use my phone to call or text, I can only use wi-fi, I have "emergency calls only" displayed where the network should be... I have tried reflashing the ROM several times, different modems and no luck, I also tried smartswitch which also didn't help. I have no clue what to do now. :crying: all similar threads about this are old. Someone pls help me.

You must flash the correct firmware for your device.

Andycapn said:
So I recently bought an S7 and was happy with it, until I got hit with an FRP lock that wouldn't let me boot. So I flashed the stock ROM from sammobile, this fixed the boot problem but now I can't use my phone to call or text, I can only use wi-fi, I have "emergency calls only" displayed where the network should be... I have tried reflashing the ROM several times, different modems and no luck, I also tried smartswitch which also didn't help. I have no clue what to do now. :crying: all similar threads about this are old. Someone pls help me.
Click to expand...
Click to collapse
Is your IMEI okay ??

Phone likely reported stolen and IMEI blocked

mrpascal said:
Is your IMEI okay ??
Click to expand...
Click to collapse
It displays the correct IMEI but status is NG

*Detection* said:
Phone likely reported stolen and IMEI blocked
Click to expand...
Click to collapse
I hope not... I think I got frp lock because I for whatever reason disabled OEM unlocking(i didn't know what it was) in developer options.