yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy Nexus] thiagodark:
hi guys, i have a gsm gnex and everything was just fine until last week when i reboot my phone and it came back with no signal i tried several reboots with no luck, so i made a factory reset and still no fix at all... and then i saw that IMEI and Baseband was shown as "unknown" in status. Like image below.

So i was reading a thread in HTC Sensation forum and someone said that removing the battery and waiting like 20 minutes solve the problem for him... i tried and yes, everything was back, my imei, baseband, etc... BUT, the problem was not fixed.

- i can't reboot or shutdown the phone, if so, it uses to turn on with unknown imei, unknown baseband, etc (sometimes it turns on okay, with everything there, i don't know why, it's just random), but if i wait, it magically appears and i get my signal back or i could do what use to be faster: let the phone off for five minutes and turn it on, and then it comes with my imei, my baseband... all okay!

- i also need to disable 3G network because it drops my signal, what makes me need to turn off the phone, or just wait the signal magically come back again......

i tried to change radio, rom, back to stock, restore nandroid backup that i made in the day one after root the phone, etc...

anyone ever seen anything like this? in any devide?

i would appreciate any help...
[Samsung Galaxy Nexus] JUSMEJOSE:
I can help you restore your original imei but I have to have your phone with me
[Samsung Galaxy Nexus] thiagodark:
i don't believe i need to restore the imei, because after some reboots and sometime with my battery pulled off, the imei just come back like magic. Like the screenshot i took right now:
[Samsung Galaxy Nexus] bloodydamnhell:
Oh lord, you'd better hope I don't get the bright idea to drunk dial tonight. My Portuguese is even worse than my Spanish.
[Samsung Galaxy Nexus] CMNein:
I'd probably go ahead and b/u your IMEI just in case.

http://xdaforums.com/showthread.php?t=1352371&highlight=restore+efs
[Samsung Galaxy Nexus] thiagodark:
just forgot... hope you have not saved the original image! =o)
[Samsung Galaxy Nexus] thiagodark:
i did.... following this thread and using this app: http://xdaforums.com/showthread.php?t=1510906

just in case!
[Samsung Galaxy Nexus] theSpam:
Which ROM did you flash? ...generally your issue occurs when a CDMA ROM is flashed onto a GSM Nexus.
[Samsung Galaxy Nexus] thiagodark:
No, never flashed a cdma rom, in fact i was "stock" when problem began... =o/ i had manually updated to 4.0.4 by downloading stock rom on google source...

I flashed several roms after problem begins and now i'm on aokp, Build 34...
[Samsung Galaxy Nexus] thiagodark:
well, after several research i figured out the problem is well known by galaxy sII users, like described in this thread: http://xdaforums.com/showthread.php?t=1261948

my problem is exact the same, i can even do the temporary fix proposed there

but solution there doesnt seems to work on gnex... does anyone know a way to 'adjust' it? since gnex doesn't have efs folder...

thanks!

actually, the question is, can i use these codes replacing "/efs" with "/factory" and "/dev/block" with "/dev/block/platform/omap/omap_hsmmc.0"
[Samsung Galaxy Nexus] jup007:
Yes, /efs is /factory and it's mounted on different device but I don't see while they suggest to recreate whole partition from scratch. You can just do renaming in place. Have you checked that your /factory directory is really corrupted (ie. files there have wierd sizes, dates, or it doesn't even mount)?

Another interesting thing to do is look at messages in /data/radio/log/nv.log (# cat /data/radio/log/nv.log as root). It may contain some clue as to what's happening...
[Samsung Galaxy Nexus] Naezor:
I'm having the same issue with a customer's phone.

http://xdaforums.com/showthread.php?t=1643015

From what I can see, /factory is intact. Same as with OP, the phone was completely stock and the customer denies rooting it or even unlocking the bootloader. He said it occurred when swapping SIM cards internationally, then returning to the states. Unlike OP, I haven't been able to get the IMEI to come back at all.

At this point, I'm not even sure if JTAG will be able to save it.

Does anyone think it could be hardware related?
[Samsung Galaxy Nexus] thiagodark:
yes, i also think that is too much work to just rename two files, but since i have tried many things and nothing seems to work and this fix looks to solve the problem to many people in gsII, i decided give it a try...

and to be honest, files look just fine, same date and size as its relative .bak!

have you tried to remove the battery for like 5 minutes? the problem looks exactly the same as your customer... it's really weird. I was all stock (only unlocked bootloader).

in my case, i can't believe it's a hardware fault, since i can make "imei, phone number, baseband, etc." come back...

the strangest thing is when imei, baseband, etc... are okay i have to set "2g only", because if i try to use 3g, network signal drops and only come back after i remove the battery for the usual 5 minutes!!

if a let 3g on and don't try to actually use the internet it stays okay, but if i open the browser and star loading a page, i.e, that's it, no signal at all...
[Samsung Galaxy Nexus] jup007:
Well, what does

# cat /data/radio/log/nv.log

say? This is log file where normally radio daemong logs unusual things...

EDIT: Btw, I've seen unknown IMEI when nv_data.bin has broken access rights (it's not accessible by radio).
[Samsung Galaxy Nexus] thiagodark:
"no such file or directory"...

how could i know if my nv_data.bin has broken access rights?
[Samsung Galaxy Nexus] jup007:
Try following 2 commands:

shell@android:/ # ls -la /data/radio
drwxrwxr-x radio radio 2012-04-20 16:02 log
-rwx------ radio radio 2097152 2012-05-07 14:49 nv_data.bin
-rwx------ radio radio 32 2012-05-07 14:49 nv_data.bin.md5

shell@android:/ # ls -la /factory/
-rwx------ radio radio 1048576 2012-04-20 03:13 .nv_core.bak
-rwx------ radio radio 32 2012-04-20 03:13 .nv_core.bak.md5
-rwx------ radio radio 2097152 2012-04-20 03:13 .nv_data.bak
-rwx------ radio radio 32 2012-04-20 03:13 .nv_data.bak.md5
-rwx------ radio radio 1 2012-04-20 03:13 .nv_state
drwxr-xr-x radio radio 2011-01-03 15:26 bluetooth
-rw------- radio radio 640 2011-01-03 15:26 hdcp.keys
drwxrwxr-x radio radio 1999-12-31 16:02 imei
drwx------ root root 1969-12-31 16:00 lost+found
-rw------- radio radio 4674 2012-04-20 03:13 nv.log
-rwx------ radio radio 2097152 2012-04-20 03:13 nv_data.bin
-rwx------ radio radio 32 2012-04-20 03:13 nv_data.bin.md5
drwxrwx--- system radio 1999-12-31 16:00 wifi
-rw-r--r-- radio radio 144 2011-01-03 15:26 wv.keys

And see how much results differ. Times will be different, sizes and owners should probably be same. Although in your case, you may not have /data/radio at all, since you don't have log file.
[Samsung Galaxy Nexus] thiagodark:
well, i noticed that /factory was totally messed up due my attempt to fix it. I retore and fix permssions to looks just like yours but for a strange reason i can't restore .nv_data.bak and .nv_data.bak.md5 through root explorer...

in any case, even with /factory without almost all files inside the issue was exactly the same and i was able to make radio works with the "battery remove" workaround...

edit: exactly same problem, but now with a generic imei! =o)

i'm gonna restore my backup when get in home...
[Samsung Galaxy Nexus] jup007:
Your /factory still as wierd permissions. Most of the files are owned by root and are not readable by radio, which will cause problem. This is probably result of restore. You made nv_data.bin owned by radio, but without accompanying nv_data.bin.md5 system will just ignore it and probably give you generic IMEI, which is what we were seeing here when md5 files didn't match bin files.

Anyway, generic IMEI looks promising. We know how to fix generic IMEI if you have backup of /factory - so please don't loose it.

So yes, restore /factory, fix the permissions

# cd /factory
# chown radio.radio .*

and try checking the log file in /data/radio/log again. Since you have the directory, I still think there must be something in there.
[Samsung Galaxy Nexus] thiagodark:
done, restored factory from backup, what was strange is that even after all files restored. with right permisions and with right owner, the generic imei remained and i had to install f*ckdocomo.apk to get it back...

now i just have the original problem =o)

i really didn't have any file inside /data/radio path before, but now it has a log and i believe is due the /factory problem and not related with the original problem

anyway, that's log in /data/radio/log

9 09:44:21 2012: MD5 is turned on.

Wed May 9 09:44:21 2012: truncate 10276 -> 5156 bytes

Wed May 9 09:44:33 2012: __refresh_md5_file: Can't open /factory/nv_data.bin.md5. Permission denied.

Wed May 9 09:44:33 2012: MD5 is turned on.

Wed May 9 09:44:44 2012: __refresh_md5_file: Can't open /factory/nv_data.bin.md5. Permission denied.

Wed May 9 09:44:44 2012: MD5 is turned on.

REPEAT FOR A LONG LONG TIME AND THEN I RESTORE FILES IN /RECOVERY copying files from sdcard

Wed May 9 09:53:20 2012: __refresh_md5_file: Can't open /factory/nv_data.bin.md5. Read-only file system.

Wed May 9 09:53:20 2012: MD5 is turned on.

Wed May 9 09:53:31 2012: __refresh_md5_file: Can't open /factory/nv_data.bin.md5. Read-only file system.

Wed May 9 09:53:31 2012: MD5 is turned on.

Wed May 9 09:53:43 2012: __refresh_md5_file: Can't open /factory/nv_data.bin.md5. Read-only file system.

REPEAT FOR LOOOONG TIME AND THEN I RESTORE MY .IMG BACKUP AND USE F*UCKDOCOMO.APK

Wed May 9 14:24:50 2012: /data/radio/nv_data.bin does not exist.

Wed May 9 14:24:50 2012: MD5 fail. orignal md5 'f6afbceb74ee4290c4563e046f24' computed md5 '6ec535b7b029665813c18d6283c7' (rild)

Wed May 9 14:24:50 2012: MD5 fail. orignal md5 '861f9436276afbcbdc44f58d473a' computed md5 'de37d01ec798841e4944ee69cf5f' (rild)

Wed May 9 14:24:51 2012: default NV restored.

Wed May 9 14:26:07 2012: /data/radio/nv_data.bin does not exist.

Wed May 9 14:26:07 2012: /data/radio/nv_data.bin does not exist.

oh, and i think all files is just fine in /factory path, but no fix at all.

i start to think it should be a hardware fault...
[Samsung Galaxy Nexus] Chaosin1983:
Thank you both for trying to fix this, this just went beyond my knowledge now, I will be watching this thread and waiting if you guys can come up with something...i am SO dissapointed that this is happening to my Galaxy Nexus...

Once again I have NO signal, NO IMEI, NO baseband...I tried reflashing a couple of radios and no luck... :(

HUGE thanks to both...
[Samsung Galaxy Nexus] jamiescott23:
I just bought a new Galaxy Nexus. And I don't wanna experience the same problem. What should i do? Is there a way to backup files containing IMEI and if any problem occurs i can restore them?

Thanks in advance.
[Samsung Galaxy Nexus] thiagodark:
at the moment nobody knows what is this problem and why it happens... so just be lucky! =o)

oh, and meanwhile, make a efs backup, the easiest way is this: http://xdaforums.com/showthread.php?t=1510906

=o)
[Samsung Galaxy Nexus] thiagodark:
i tried what you said and i had no luck...

i don't think efs files are broken because i can make my imei, baseband, imei sv, etc appears by removing battery for 5 minutes, what i can't do is reboot or try to use 3g network, because it makes signal and i need to pull the battery again...

when i deleted /factory the problem was exactly the same: unknown imei, baseband... and when a pulled my battery for 5 minutes everything came back, but with a "0049" imei...

i'm thinking: what could cause unknown imei, baseband... that 5 minutes without battery can fix? i believe the problem is not on efs files, as a matter of fact, it is the akward problem i have seen...

i still gonna searching for an answer...

thanks for your help
[Samsung Galaxy Nexus] jamiescott23:
Mate, they have saved another phone's IMEI to mine, it's complicated in turkey. Otherwise you can't use phone in Turkey. You need to buy it in Turkey. If otherwise, you should register it with your passport that proves you have gone abroad in the last 30 days.

Anyway, there was no IMEI and baseband. I just went back to factory settings and it came back. REstarted it a few times to see if i'll see same problem as you did, NOT YET.

But i can return the phone. What should i do?
[Samsung Galaxy Nexus] Chaosin1983:
Any progress guys? I'm loosing my patience with this thing, I've been seconds from throwing it against the wall...:mad:

I've noticed that sometimes when my signal goes out after having signal (when I do have IMEI and Baseband), I can see that the Airplane Mode is ON on the Power Menu and greyed out, but unchecked in the settings menu,Could it be that it is rather an issue with the Airplane mode auto triggering itself? Any ideas?

Edit: it just happened again, I flashed radio XXLA2...it worked ok for a while, and out of the blue, i have no signal...if I check the power menu, it has airplane mode ON, but grayed out, in the settings the checkbox is unchecked.

Edit2: did a factory restore...and so far (last 30 mins) I've had solid signal.
[Samsung Galaxy Nexus] guard3:
Same issue here and I was alone http://xdaforums.com/showthread.php?t=1618163
[Samsung Galaxy Nexus] thiagodark:
well guys, i'm giving up, just can't figure out what the hell is wrong with this phone i really think is a soft issue and it's related with 3g modem but i don't have knowledge enought to make a proper solution...

it's "nice" to know that i'm not the only one with this issue, so maybe someone clever than me could figure out how to fix...

it's really disappointing...

oh, and if someone could post a good /efs backup would it would be really great, i don't believe the problem is there, but i could know for sure! =o)
[Samsung Galaxy Nexus] thiagodark:
try to disabke data over mobile network in "wireless and network options" and see if signal drops...
[Samsung Galaxy Nexus] Chaosin1983:
OK I got something new I think...

So i did a total factory restore right... back to 4.0.1 that came with the phone...I waited until Android asked me to update OTA, signal was stable with 4.0.1 so I waited a few hours to install 4.0.2...after installing it, I left it for a few hours, and signal was still stable...then I installed the OTA 4.0.4...and within half an hour I had the same problem...signal dropping, no baseband, no IMEI...so I'm pretty sure is 4.0.4 that is messing with my phone.

So I went back to 4.0.2 (radio XXKK6 which comes with the update)...and then installed AOKP M4...which is 4.0.3...so far (the weekend) signal has been OK, not totally stable, but say 95% stable, it will sometimes switch back to 2G, and within seconds go back to HSDPA. I do get the dropped signal once in a while (a few seconds, or needing a reboot once or twice), if I pull up the power menu while the signal is out, i can actually see the airplane mode switching between on and off, and after a few seconds it will stay off, and I will have signal again...

I am convinced that something is autotriggering the airplane mode...is there a way completely remove the airplane mode?

I know it is not a solution, but at least it will make the phone work as a phone again, I'll just wait for the next Android update and see if they worked this out.

Hope this helps.

Can you guys replicate what I did and see if yours works the same?

PS: pulling the battery for 5 minutes (or more) does not return my signal/iemi/baseband...
[Samsung Galaxy Nexus] thiagodark:
i already did this and for me, when it booted on 4.0.1 it came with no signal... and unknown baseband and imei... i don't think it is related to 4.0.4, i believe in your case it was just coincidence! i did exactly same thing, flash stock 4.0.1 and updated until 4.0.4... gonna try again, just in case!

Mine does the same thing with airplane mode "triggering on and off", but i dont think that something is triggering "airplane mode", i think it shows that way because phone is trying to turn on the radio (so it shows airplane off), and when cant do this, it shows "airplane mode on"...

pulling the battery does not have anything for me either, what happens is: if i turn on and imei/baseband is "unknown" there's nothing i can't do, i need to shut down and wait a little bit and turn it on again, and if imei are back, okay, i just need to let 3g disabled and can use it as phone... i don't actually need to remove the battery, i need just to wait when it is off...
[Samsung Galaxy Nexus] Chaosin1983:
Ahh damn don't tell me it's a coincidence :( ...will it is still working that way so far, I'll just cross my fingers and hope it doesn't lose signal permanently again. Give it a try again and let me know what happens...

At the end of the day I will post a picture of my signal status throughout the day...

I still can't believe nobody knows how to fix this... do you think a Samsung Service Center might help (of course turning the phone completely back to stock locking bootloader?
[Samsung Galaxy Nexus] Naezor:
*Raises hand* Samsung certified technician and I'm stumped.

---------- Post added at 11:42 AM ---------- Previous post was at 11:38 AM ----------

When I received this customer's phone, it was still stock on the 4.0.2 that we shipped it with. During my initial troubleshooting, I updated it to 4.0.4, still didn't resolve the issue. Downloading 4.0.1 to see if that helps any. I'll report my findings. Jeeze, I really don't want to JTAG this thing... UGH!
[Samsung Galaxy Nexus] Chaosin1983:
Oh man... please let us know what Samsung says about this??? do you think warranty would cover it? please report to back to us. BTW what is JTAG? would that fix this?

Here's the picture of my signal throughout the day...by far stable, and it'll jump betwen No Signal, GPRS, EDGE, 3G and HSDPA, and it is also taking a hit at my battery for sure....but at least I can make and receive calls so for now... I will stop touching it until we get something new.

[/URL]
[Samsung Galaxy Nexus] thiagodark:
Chaosin, i tried downgrade again and no, it doesnt seems to be related with OS or radio version...

screw this, i'm givening up... gonna buy an iphone this month!

i'm really tired and disappointed with this!
[Samsung Galaxy Nexus] Chaosin1983:
Damn! i just can't believe there is no way to fix this...

thiagodark please don't go to Apple! LOL... I've been eyeing the Galaxy Note lately as a replacement if I am unable to fix this god forsaken thing...but I would be really mad if I had to throw away the 600 bucks I payed for this thing...

A small update on my situation:

Just for kicks I flashed AOKP Build 36 4.0.4...and after 5 mins of running my signal went dead, never to return again...so I went back to AOKP M4 4.0.3...running XXKK6, and I have unstable signal, every once in a while dropping and requiring a reboot to get the signal back. :mad:

Naezor, any news on your situation?

EDIT: Update! I tried changing the Kernel to Fugumod, and my signal is fixed, running AOKP B36...solid H signal...!!!! (crossing fingers this will last, it's been working perfectly for the last 4 hours)
[Samsung Galaxy Nexus] thiagodark:
i called to samsung yesteday and they said they couldn't even touch the phone because it is imported and not like what is made here, so neither if i pay they could make it work...

i took it to the samsung authorized center anyway and, i swear, the guy there knows about phones less than ANYONE here on xda, when he starts to find the sdcard i said: "nevermind..."

anyway, no progress at all, trid to flash several roms, thru odin, cwm, fastboot... and nothing...

the thing is i don't have much time to 'play' with it... tonight i'm gonna try your combo and see what happens...

thanks

oh and now that i decided that i'm gonna buy a new phone, i probably gonna brick it!! ehehehe
[Samsung Galaxy Nexus] Chaosin1983:
Well I think I might have to start deciding on buying a new phone as well, because my new combo died just now...:mad:

:(

EDIT: bit the dust and got the Note, it should be here by Friday. I'll keep trying to fix it since I need to sell it for something.
[Samsung Galaxy Nexus] Chaosin1983:
Anything new guys?
[Samsung Galaxy Nexus] thiagodark:
not at all... tried a few other things but nothing seems to work!

=o\\
[Samsung Galaxy Nexus] moizsami:
Hey guys im worried now, iwas thinking to buy this phone, but im afraid of this problem, i was going to buy it from india and without warranty.

what should i do now?

Is there any solution out there yet..?
[Samsung Galaxy Nexus] thiagodark:
no, there is no solution out there yet

flashing .imgs (radios, roms, bootloaders) doesn't solve the problem... there is absolutely no radio or rom that makes it works right. I tried everyone.

and i'm pretty sure it is not related to efs/factory partition

to be honest with you, without warranty i wouldn't buy the, not at all... it's a pretty expensive device to take the risk to end with a VERY expensive mp3 player... even the chance is not that high!!

i'm seeing several threads about this and no fix til now:

http://xdaforums.com/showthread.php?t=1643015

http://xdaforums.com/showthread.php?t=1618163

http://xdaforums.com/showthread.php?p=26340507

http://xdaforums.com/showthread.php?p=26369207

but it's up to you! =o)
[Samsung Galaxy Nexus] Naezor:
JTAG didn't work.

-_-

Not. Happy. Camper. I'm rarely stumped.
[Samsung Galaxy Nexus] moizsami:
hey just got a question... so if i dont use my mobile network at all i.e keep 2g/3g off all the time. would i still face this problem...?

im very keen on buying this phone..

Please reply....Thanks
[Samsung Galaxy Nexus] thiagodark:
really? i guess nothing else can be done... wtf, weird problem

well, that's depends on... i'm able to use the phone as a dumb one, with no data active activeted (except wi-fi), but Naezor, on the other hand, has a device that can't be used in anyway, no data, no voice... only wifi, bt, etc...
[Samsung Galaxy Nexus] Chaosin1983:
I on the other hand have a phone that cannot be used as a phone, no GSM signal, only WiFi...but every now and then I will have GSM signal out of the blue!

But just because this happened to us doesn't mean it will happen to you, there are millions of people that never had this problem...for the price, this is a damn fine phone...

Hey guys, does any of you know how to claim warranty for this phone if it was bought online?
[Samsung Galaxy Nexus] thiagodark:
i think that depends... you should ask for warranty directly from where you bought from...
[Samsung Galaxy Nexus] ottoTheGreat:
I have the exactly the same problem -.-

Jeez. The signal just dropped one night. No baseband, No IMEI.

I tried every freaking thing with the risk of bricking my phone.

I agreed with thiagodark, it doesn't seem to be a EFS problem. I looked at them,

they seemed to be perfectly fine. The date of modification and etc went way back

before my problem appeared, when I did not even root my phone.

So disappointed.
[Samsung Galaxy Nexus] geoffcorey:
I got my phone back from repair, they had to do a pba replacement. There was a physical fault with the modem.
[Samsung Galaxy Nexus] thiagodark:
I ended buying a new device, but is nice to know what the fu. is that problem... Physical fault is a pretty reasonable possibility... Thanks
[Samsung Galaxy Nexus] haziqshaikh97:
hey did u try odin back to restore or u can also try sptbox toolkit it will repair the imei and then try flashing a suitable radio xxla2 if its the gsm version and hopefully it will work :)
[Samsung Galaxy Nexus] dhuberto:
I'm in the same boat .. and the repair cost!? my warranty is out: (
[Samsung Galaxy Nexus] thiagodark:
Sorry dude, you cant fix it here in brazil, i took it to a samsung service center and they said they couldnt do anything because the device was not made here...

As your warranty is "out", my guess is that your phone is imported too. Since gnex was released here in feb..
[Samsung Galaxy Nexus] dhuberto:
Thank you, and if a physical problem of the pba (modem) I will send him or seller! EUhueh :(
[Samsung Galaxy Nexus] alaap anklesaria:
i got the same from india and the device seems to have lost network out of the blue

the imei is also showing unknown

please help