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[Q] n7100 basband unknown IMEI null i don't have efs

I bought device with these specifications so the sim is not working unknown baseband null IMEI tried to flash a custom rom didn't solve anything I don't have efs backed up
any 1 knows how to fix it please tell me step by step
thanks

I have the same problem.....sorry to say your device may have a coruppted board esp since you did not backup your efs....I'm looking for a fix also but all says that a new board may be needed......wish someone has a fix tho!

[Q] GT-I9505 Imei no: Null Problem

Hi all,
Yesterday my phone was working perfectly but this morning there wasnt any service signal.
I cant call,send messages,,,,it cant read sim-card.
I tried flash stock rom with odin v3.9 , wiping data/caches files. This solved my problem only for 2 hours. After 2-3 hours Imei lost again.
When i dial *#0011*# there is only blank screen.
Is there any solution for Null Imei No ? (I have original Imei no btw)
Should i Root my phone?(No experience with rooting).
What sould i do .
4.4.2
ap: I9505XXUGNK4
csc: I95050XAGNK4
Thank you.

Hi there,
You have some nice tool for restore your device here:
[TOOL][I9505-I9505G/I9515] AntaresOne's IMEI backup/restore tool
And some discussions about that here: [Q] I9505 Imei null/null - Baseband version Unknow
Good luck

Help!!!ATT LG G3 have IMEI number, but unknown Baseband Version

My phone is unlocked. Currently I use Tmobile. After I restore my phone from backup from crash, my phone get signal from Tmobile like on and off. When I check about phone, I see I have IMEI number, but on Baseband Version, it shows unknown. Can you please help me to fix this issue? Thanks you!!!

Urgent - Firmware & modem from other countries?

I've soft bricked my g930f but managed to get it going again and it's rooted. However, along the way I have managed to lose my IMEI and some other info. I am currently downloading what I believe to be the original country firmware (trinidad / tobago) and will try flashing that when I have it. I don't know if this will restore the following information that is missing, as well as (I hope) enable me to once more connect with my GSM provider. If anyone knows whether this will work I would value the advice.
Using PhoneInfo, here is a list of the missing information on my g930f:
Country of Origin (this used to be Vietnam but is now blank)
Manufacturing Date
Product Code
Available CSC codes
Mobile Operator (there is actually a single comma in this line)
Baseband version
Modem Board
Hardware Revision
IMEI
Samsung serial number (a bunch of zeroes here)
Does it seem likely that the lack of a correct modem file is the culprit for these missing items? I do have the original IMEI number written down (it's also on the back of the phone.)

UPDATE: I tried this: http://forum.xda-developers.com/galaxy-s2/general/guide-recover-imei-9-steps-t1264021 but it did not fix my problem with the IMEI. I did have a backup of the EFS folder but it may have been taken after the damage had been done.
I am currently still downloading the Trinidad/Tobago firmware from Sammobile and will post what happens when I attempt to flash that.

How did you soft brick your phone? You flashed a firmware for other countries? I'm planning of flashing the unknown firmware from Sammobile too, please keep up updated. Thank you.

I once had a problem with the IMEI, but it was because the phone was blocked by the Mobile Company.

No network SM-G920F 350000000000006

I have a SM-G920F and one day the imei went 3500000000006. This made the phone go "No Network" and no sim would work in it. I then proceeded to repair (not change) the imei to its original imei as stamped on the back with numerous files and fixes to the point I am now abit lost.
The phone is now on Factory Binary bband vers G920FXXU6ERC1 BUILD NUMBER LRX22.FA50_G920FXXU6ARC1 and after reseting the EFS the imei is back to 350000000000006 / 02.
I have tried to "repair" the imei to back to its original imei but which I could do before but now I just get:-
Waiting ADB device... OK
Reading phone info...
Model: SM-G920F
Android version: 5.0.2
Product code:
Phone version: G920FXXU6ERC1
PDA version: FA50_G920FXXU6ARC1
CSC version:
CSC country code:
CSC sales code:
HW version:
Phone SN: 00000000000
Chip name: EXYNOS7420
Modem board: SHANNON333
RF cal date:
IMEI: 2515925302514f0
Checking Super user right... true
Reading NV data... OK
Checking NV data... error
Security damaged (1)
The imei above is not mine that just appears when I try to repair the phone but *#06# says 350000000000005 / 02 and no S/N. The only FW the phone will flash with is
G920FXXU6ERF5_G920FDBT6ERF1_G920FXXU6ERF6_HOME.tar (BTU) using samfirm and the factory binary thats on it at the mo , all the rest fail in Odin.
Is the phone bricked or is it sw repairable ?. If it is repairable could someone please point me to the correct files that I would need and which program/s do I use and the order I flash the phone with the files ?. Any help or guidance would be greatly appreciated. I have spent the best part of a week reading up and flashing the phone but I'm now at the point were I honestly don't know which files , programs to use and in which order. Any help files or links, guides would be greatly appreciated.
P.S. just to make it clear the phone is not blocked it seems it just got corrupted somewere along the line and I am trying to restore the imei back to it's original imei not change it in any way shape or form and hopefully fix the "No Network" which is stopping any sim from been used.

https://forum.xda-developers.com/galaxy-s6/help/flash-rom-wiped-data-twrp-help-asap-t3747981
This is what helped me. I couldnt even turn my phone on and computer didnt recognize it.

Thanks for that , I did try it but still the same. I think mines a deeper problem , something to do with a corrupt EFS or NV_DATA.bin. which files and how you repair it I think is my problem