Develop Bugs

[SOLVED][Q] IMEI and Baseband unknown. I don't have a backup.

[SOLVED] I put my phone in airplane mode and my IMEI/Baseband came back, cheking the service menu I went to *#2263# and saw that "LTE Preference" was enabled. I clicked on Automatic and problem fixed. Probably a ROM bug? Who knows.
Hello there. I've been a reader of the XDA forums for some time but I never had any reason to create an account to post on the forums.
A few weeks ago I got a SGH-M919 as a gift, the phone only had a few months of use and I took it with me, everything worked fine except for the fact that I couldn't get 3G/4G (Not even EDGE), I was only able to connect to the GPRS network and I couldn't change the carrier (It always gave errors like "Unable to connect. Try later" and such). Although the phone is (apparently) quadband (I don't live in the US), it just didn't work but I lived with it.
Yesterday my phone was low on battery and I turned it off, a few hours later I turned it back on and it couldn't connect to the network, I went to the network options and once I pressed the screen to enter the Mobile Network options, I got an alert saying that I must have a SIM to access those option. At first I thought that the SIM got damaged somehow (This isn't the case since it works perfectly fine in another phone) but after a few minutes looking around, I checked the IMEI and instead of the usual number, I got a null/null message. My first reaction was to google what exactly happened and the answer I received was that the Baseband (Which is also Unknown) and IMEI are stored in a folder called EFS and that it got corrupted. Sweet. I looked for solutions but the main two I got (EFS Pro and ADB nvrestore) require a backup of the EFS (Which I don't have).
The other solution I got was to restore to the stock ROM (M919UVUFNH7) which I'm currently downloading from SamMobile (Sorry if this is considered spam). The phone is not rooted and has the stock ROM, it came with a CWM folder inside the internal memory with an .img file but it doesn't have CWM intalled. I've never upgraded it (Not sure if it came with that firmware from the store if it matters).
I live pretty much in what can be considered a "3rd world country". So I cannot send it to Samsung nor I have access to dollars.
Another question is, the phone was gifted to me already unlocked, I don't know if it came unlocked from the original carrier or if it was unlocked via a code or whatever. If I restore to the stock will it lock my phone to T-Mobile again? Would I be able to use it without a SIM card if it gets locked? It's impossible for me to get a T-Mobile SIM on my hands should I ever need one. In the worst case scenario that my phone gets locked, can I get it unlocked by flashing a custom ROM?
I have so many newbie questions that are already answered in other threads, but since it's a lot of information I want to get it as specific as possible to avoid breaking my phone.
If someone can help me with this issue, I'd really appreciate it.

i having same issue in M919

Do you guys get a message in notification bar about sim car removed or something about a sim card? Also, it doesn't matter if the sim card works in another phone. This device has a little issue with being picky with sim cards. If it's a cut sim card, get an original micro sim card

serio22 said:
Do you guys get a message in notification bar about sim car removed or something about a sim card? Also, it doesn't matter if the sim card works in another phone. This device has a little issue with being picky with sim cards. If it's a cut sim card, get an original micro sim card
Click to expand...
Click to collapse
Hi, thanks for answering. I don't get a message about a removed SIM card. I'm also using an original micro SIM.
I already downloaded the Stock ROM but I haven't flashed it yet.

serio22 said:
Do you guys get a message in notification bar about sim car removed or something about a sim card? Also, it doesn't matter if the sim card works in another phone. This device has a little issue with being picky with sim cards. If it's a cut sim card, get an original micro sim card
Click to expand...
Click to collapse
This is a known bug of the s4. It is a hardware problem and I have yet to find a solution. If you google it you will find many threads on different forums addressing this issue. Again, no known solution

Any answer/idea about my issue? . Sometimes I can access Mobile Network Options, sometimes I can't. I can't configure the APNs (They delete themselves after I click on save). Phone Serial Number didn't get deleted (Which is stored inside the EFS folder as far as I know). I also can't select a Network Mode. I click on GSM/WCDMA/LTE but it changes automatically to nothing.

k8108 said:
This is a known bug of the s4. It is a hardware problem and I have yet to find a solution. If you google it you will find many threads on different forums addressing this issue. Again, no known solution
Click to expand...
Click to collapse
That's what I said? One solution is to change sim cards if using a cut sim card to use an original micro sim. It's worked for a friend if someone I know and also for others on XDA. It's not the solution, but works for some
exeichdi said:
Hi, thanks for answering. I don't get a message about a removed SIM card. I'm also using an original micro SIM.
I already downloaded the Stock ROM but I haven't flashed it yet.
Click to expand...
Click to collapse
I would get a new sim anyway if I could. Flashing stock firmware wouldn't hurt as well

serio22 said:
I would get a new sim anyway if I could. Flashing stock firmware wouldn't hurt as well
Click to expand...
Click to collapse
Before trying to flash it, is there any risk of getting simlocked again? I wouldn't want to get my IMEI fixed just to realize that my phone is locked to TMB again
UPDATE 1: My IMEI and Baseband randomly got back (My IMEISV was still missing) but after I restarted, they got deleted again.
UPDATE 2: Rooted, went to EFS, didn't find nv_data.

Requesting software upgrade assistance

Hello All,
I have a verizon LG G4 that was purchased in late 2015 and I am no longer a Verizon customer. Since I now use ATT, I decided to shred the old Verizon sim card and switched to unlocked s7.
Since the phone no longer contains a sim card, when I try to use the verizon software upgrade assistant on PC, while the utility shows that there is a software update for a moment, it immediately switches and says that phone is upto date. The phone number shows up as 000-000-0000 (most likely because there is no sim card in it)
Would you please let me know if there is a way around to get the software update? Perhaps, a way to download the update locally to my PC and then push it to the phone?
Thanks!

yubeie said:
Hello All,
I have a verizon LG G4 that was purchased in late 2015 and I am no longer a Verizon customer. Since I now use ATT, I decided to shred the old Verizon sim card and switched to unlocked s7.
Since the phone no longer contains a sim card, when I try to use the verizon software upgrade assistant on PC, while the utility shows that there is a software update for a moment, it immediately switches and says that phone is upto date. The phone number shows up as 000-000-0000 (most likely because there is no sim card in it)
Would you please let me know if there is a way around to get the software update? Perhaps, a way to download the update locally to my PC and then push it to the phone?
Thanks!
Click to expand...
Click to collapse
u can update your phone using LGUP

aashish_believe said:
u can update your phone using LGUP
Click to expand...
Click to collapse
Thanks Aashish! I figured that.. I found a thread containing this info.. I'm all set! thanks!

yubeie said:
Thanks Aashish! I figured that.. I found a thread containing this info.. I'm all set! thanks!
Click to expand...
Click to collapse
you're welcome bro!!!

Updated to MM6.0, now when i turn on the phone I see an image from a carrier

I should explain, my LG G4 is a H815P, before the update (when it had lollipop) it didn't have any image from ANY carrier, (I mean the image that is shown when you turn on the phone after the LG's logo), the change happened when I updated the phone from lollipop 5.0 to mm 6.0 and I don't know why!! Can you guys explain me please...
I did the update with my sim card inside the phone via LG BRIDGE...was it the cause of this?, btw, the image of the carrier that is shown right after I turn on the phone is the same of my phone line which is Claro, I find this extremely weird because I DIDN'T BOUGHT THE PHONE "FROM THEM" I bought it from another store that sold it as a free carrier phone...and as I said before, the couple of times I saw it turning on it didn't show the image of this carrier and I've always used the same sim card (before and after the update) I don't even know if this also means that from now on I can only use this phone with this particular carrier...what is going on?
I don't like the image from that carrier showing up, what can I do without voiding my warranty to keep my phone "clean" as before?

Can somebody tell me please why updating my unbranded phone branded it?

I should explain, my LG G4 is a H815P, before the update (when it had lollipop) it was brand free and it didn't showed me the image I'm seeing now (I mean the image that is shown when you turn on the phone after the LG's logo), the change happened when I updated the phone from lollipop 5.0 to mm 6.0. Can you guys explain me please...
I did the update with my sim card inside the phone via LG BRIDGE... btw, the image of the carrier that is shown right after I turn on the phone is the same of my phone line which is Claro, I find this extremely weird because I DIDN'T BOUGHT THE PHONE "FROM THEM" I bought it from another store that sold it as a free carrier (or unbranded) phone.
I don't like the image from that carrier showing up, what can I do without voiding my warranty to keep my phone "clean" as before, like re-installing MM unbranded? and how do I do that...pls help

It's probably just something LG put in there, not that your phone is locked. I used to be from a network called MEO (Portugal) and didn't have any branding, but recently I switched the card for a Vodafone and suddenly LG started suggesting me to install apps from Vodafone (didn't get the boot animation tho) because Vodafone is partner with LG. It's probably the exact same thing you are facing right now, just something LG put on there that is activated when using a card from that carrier

Loose signal N976N

Hello, Hope all are well.
My device Note 10+ 5g, Model N976N, (Carrier_ID: KOO)
I cant get Signal from SIM, The device did not recognize the SIM cards.
A technician make software for the device, and, in About phone, I can see the Model number(SM-N975F).. I've make some software chages/flashes and the device was corrupted.
A technician make software and, in About phone, I can see the Model number(SM-N976B/DS).. I got the signal for one time then loose it.
What is ur advice?
Can I flash N976Q with (KSA or XSG - Arabic country code) ? Still have Arabic Language and Signal in 2-SIMs ?
Thanks in advance.

Hello mohgaza,
To me it is a bit hard to understand your problem.
has your sim card ever worked
If so: what happened / what did you do that caused the problem
please try to improve your question.
You also state two different model numbers in your question. Why is that? What technician are you talking about?
mohgaza said:
I got the signal for one time then loose it.
Click to expand...
Click to collapse
This could be a loose contact or some working configuration between a lot of nonworking ones or something completely different. What country do you want to use your phone in? The choice of the modem file should usually depend on that.

Hello, I'll clarify:
SIM cards worked for less than an hour, JUST restarted and lost SIM signals.
Technician was trying to resolve the problem.
Worked well on n975f, BUT I flashed other firmware by mistake,
Then I went back to the technician and he tried n976b.
My carrier is Israel / Palestine, and I want to activate the 2-SIMs

So If the N975F Version works well, why don't you flash it?

PauSteu said:
So If the N975F Version works well, why don't you flash it?
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It seems because I've flashed the most latest, and cant DOWNGRADE ..

that is becuase the phone has a patched IMEI try searching auto patch roms and install it will help you. or take it a better phone technician who has proper flashing boxes like Chimera it will patch the imei.