Develop Bugs

How to manually update I747 to 4.4.2

Hey guys,
I got a I747 I want to give to my mother as a gift.
I downgraded 4.1.2 to 4.1.1 and ran the secret menu unlock to unlock the sim card, that worked perfectly.
Now I want to update this out of 4.1.1 to 4.4.2 but I cannot find a stock firmware to run on odin anywhere.
Do I need to go to 4.3 first? Is there a stock firmware for that?
SamMobile stops at 4.1.2... OTA obviously doesn't work.
How Can I get this done..

Iz3man said:
Hey guys,
I got a I747 I want to give to my mother as a gift.
I downgraded 4.1.2 to 4.1.1 and ran the secret menu unlock to unlock the sim card, that worked perfectly.
Now I want to update this out of 4.1.1 to 4.4.2 but I cannot find a stock firmware to run on odin anywhere.
SamMobile stops at 4.1.2... OTA obviously doesn't work.
How Can I get this done..
Click to expand...
Click to collapse
You can just flash stock 4.1.2 firmware from sammobile and then run OTA updates.
I also found this on sammobile: Canada (Bell Mobile) (Black Edition), Version: Android 4.4.2, PDA: I747MVLUFNE6
CSC: I747MOYCFNE6, MODEM: I747MVLUFNE6

audit13 said:
You can just flash stock 4.1.2 firmware from sammobile and then run OTA updates.
I also found this on sammobile: Canada (Bell Mobile) (Black Edition), Version: Android 4.4.2, PDA: I747MVLUFNE6
CSC: I747MOYCFNE6, MODEM: I747MVLUFNE6
Click to expand...
Click to collapse
Will it work though.
I have it already on my pc, I updated my wife's with it.
If I update to 4.1.2 will OTA come? Even with the I747(not the I747m) on the Bell network?

Iz3man said:
Will it work though.
I have it already on my pc, I updated my wife's with it.
If I update to 4.1.2 will OTA come? Even with the I747(not the I747m) on the Bell network?
Click to expand...
Click to collapse
I have a Motorola Atrix from Bell. I flashed it with stock ATT firmware and received OTA updates from ATT over wi-fi.
Since you have the i747, start with stock pre-rooted ATT 4.1.1. This will flash the stock recovery, radio, and bootloader. Run triangle away, flash a stock unrooted ATT stock 4.1.1 ROM, and take the OTA updates.
http://forum.xda-developers.com/sho...mctr=(not provided)&__utmv=-&__utmk=135374642

audit13 said:
I have a Motorola Atrix from Bell. I flashed it with stock ATT firmware and received OTA updates from ATT over wi-fi.
Since you have the i747, start with stock pre-rooted ATT 4.1.1. This will flash the stock recovery, radio, and bootloader. Run triangle away, flash a stock unrooted ATT stock 4.1.1 ROM, and take the OTA updates.
http://forum.xda-developers.com/sho...mctr=(not provided)&__utmv=-&__utmk=135374642
Click to expand...
Click to collapse
Ok, so I guess it wasn't clear, my bad.
I have 4.1.1 stock firmware on my att 1747. It has never been rooted.
I run the Ota and I got an error, now it tells me "Your software is up to date".
Can I flash a bell i747m 4.4.2 image onto this i747 or will it brick?

Iz3man said:
Ok, so I guess it wasn't clear, my bad.
I have 4.1.1 stock firmware on my att 1747. It has never been rooted.
I run the Ota and I got an error, now it tells me "Your software is up to date".
Can I flash a bell i747m 4.4.2 image onto this i747 or will it brick?
Click to expand...
Click to collapse
You can flash i747m firmware on your phone but DO NOT flash the radios or bootloader from an i747m to an i747 and vice versa. Bricking is a really possibility if you do that.
Do you have a custom recovery? If you do, you will need to install a stock recovery.
Try resetting the phone (wiping cache, data) in recovery or through the ROM itself.

audit13 said:
You can flash i747m firmware on your phone but DO NOT flash the radios or bootloader from an i747m to an i747 and vice versa. Bricking is a really possibility if you do that.
Do you have a custom recovery? If you do, you will need to install a stock recovery.
Try resetting the phone (wiping cache, data) in recovery or through the ROM itself.
Click to expand...
Click to collapse
Alright, I have the stock recovery. How do I not flash the radio and boatloads when using the firmware from sammobile?

You cant. You cannot flash another devices firmware. Odin wont let it happen and if it did youd end up hard bricked due to mixed firmware. For example your sbl1, modemst and param partitions (plus others) would be i747 and youd be flashing sbl2, sbl3, rpm, etc from an I747M.
The only thing you could use are the system partition and kernel, nothing else. There are two ways to accomplish this, one is to build a rom from the firmware and flash that. The other is to flash with mobile odin, but that requires root and youd still have to be very careful.
Another priblem I see you encountering is you cannot run 4.4.2 without 4.3 or newer firmware. It will not boot otherwise.
You need to go to the General section and follow one of enewman17's tutorials to get to either 4.3 or 4.4.2. Personally, I dont see any other way you will be able to accomplish it.

audit13 said:
You can flash i747m firmware on your phone but DO NOT flash the radios or bootloader from an i747m to an i747 and vice versa. Bricking is a really possibility if you do that.
Do you have a custom recovery? If you do, you will need to install a stock recovery.
Try resetting the phone (wiping cache, data) in recovery or through the ROM itself.
Click to expand...
Click to collapse
Alright, based on Doc holiday, and others they say It cannot be done and from my experience I beleive them.

Thank you,
It's very difficult to do this when others are giving bad advice.
So for the record, cannot flash i747m firmware to i747.
Thanks!
The annoying part here is I can do it with my m7, I just flashed the Dev edition onto my Bell m7 with no problems.

All devices are different in many ways. What is perfectly safe to do with one brand or model can brick another.
And I wouldnt call it "bad" advice... I've seen audit13 and others helping lots of folks with very good advice. We all make mistakes and we all have more we can learn about these devices. No one knows everything about this stuff and shouldnt let that prevent them from trying to help.
Those who are trying to help are doing so with the best of intentions and tell people what they think could be the best way to solve a given problem. In cases like this one, its easy to see how anyone would think its ok to flash different firmware between similar models based on being able to do so on other devices they are familiar with. (If I had gone into those forums I wouldve been telling people the opposite and ended up being wrong there.)
All I can say is chalk it up as a new lesson on a different device, and I hope you still appreciate that someone was trying to help.
@audit13 I hope none of this discourages you from helping. Ive seen plenty of threads where your advice was sound and appreciated, and I am glad you have been around to help so many people out!
Now, back on the problem at hand... if you want to be running the latest 4.4.2 kk, you will have the option to use the OS (/system and kernel) from either the I747 or I747M firmware. But first you must fully update to a minimum of the 4.3 MJB firmware for the I747. Once you have this running for your base firmware/bootloader, you can then run the Bell or AT&T (4.3 or 4.4.2) system. (I hope this is making sense!)
So first, update the full 4.3, MJB, firmware via Odin. (Theres a thread in General with the file, ill post the link in a min).
If you want to update to 4.4.2 firmware, you can then follow enewman17's tutorial to do so via OTA.
You can then either stay with that, or use Mobile Odin to flash ONLY the system and kernel from the Bell firmware.
Let me know if any of that needs better clarification! Also let us know what your ultimate goal is. From the options you have, where do you want to end up?
---------- Post added at 10:32 AM ---------- Previous post was at 10:26 AM ----------
Ok, here are some links.
Stock MJB firmware (flash in Odin)
http://forum.xda-developers.com/showthread.php?t=2722660
enewman17's thread for updating to 4.4.2 (high success rate)
http://forum.xda-developers.com/showthread.php?t=2789917
Official, unmodified 4.4.2 OTA
http://forum.xda-developers.com/showthread.php?t=2788012
After updating with the 4.3 firmware, you can first try using the official ota to update. Then, if that fails you can go to enewman17's thread and try his method.

DocHoliday77 said:
All devices are different in many ways. What is perfectly safe to do with one brand or model can brick another.
And I wouldnt call it "bad" advice... I've seen audit13 and others helping lots of folks with very good advice. We all make mistakes and we all have more we can learn about these devices. No one knows everything about this stuff and shouldnt let that prevent them from trying to help.
Those who are trying to help are doing so with the best of intentions and tell people what they think could be the best way to solve a given problem. In cases like this one, its easy to see how anyone would think its ok to flash different firmware between similar models based on being able to do so on other devices they are familiar with. (If I had gone into those forums I wouldve been telling people the opposite and ended up being wrong there.)
All I can say is chalk it up as a new lesson on a different device, and I hope you still appreciate that someone was trying to help.
@audit13 I hope none of this discourages you from helping. Ive seen plenty of threads where your advice was sound and appreciated, and I am glad you have been around to help so many people out! ]
:thumbup::beer::sly:
err on the side of kindness
Click to expand...
Click to collapse

[Q] APN not listed and cannot add

I was on CM 10.2.1
I upgraded to CM11 - I get no wireless data. My phone works but I have no APNs and I could not add them.
I tried SlimKat 9.0 same issue with the APN
I upgraded my CWM to 6.4.0.7 as I heard that caused issues when upgrading to CM11.
I bought Mobile Odin and flashed that way as I thought it might help.
Ive done the following to fix my APN
1) Loaded an old one from working CM 10.2.1
2) Run Root Tweak with the fix APN for CM11 checked
3) Done the airplane mode trick
4) Attempt to add one manually
Does anyone know why this is happening and more importantly how to correct this issue?
Yes I did pore through other threads on how to fix this but no avail.
Thank you

What is your bootloader and modem? Do you get data if you re-install your previous ROM?

audit13 said:
What is your bootloader and modem? Do you get data if you re-install your previous ROM?
Click to expand...
Click to collapse
Bootloader = I747UCDLK3
Modem = I747UCDLK3
Yes I get data when I load a backup of CM 10.2.1
Thanks

Data does not work on ROMs beyond cm10.2 because your bootloader and modem to too old.
I recommend flashing back to stock 4.1.1, sim unlock your phone if it is not already sim unlocked, and run OTA updates to at least 4.3, then install recovery and CM11.

audit13 said:
Data does not work on ROMs beyond cm10.2 because your bootloader and modem to too old.
I recommend flashing back to stock 4.1.1, sim unlock your phone if it is not already sim unlocked, and run OTA updates to at least 4.3, then install recovery and CM11.
Click to expand...
Click to collapse
Thanks for the quick reply. That sounds hard. From what I'm reading going back is treacherous.
So these are the steps.
1. Load this firmware via ODIN -> I747UCDLK3_I747ATTDLK3_I747UCDLK3_HOME.zip -- What about gapps? Is that in this zip?
2. Run triangle away. (Do I need to do this?)
3. Contact my carrier to unlock my sim. (If this is carrier unlocking ie taking my att phone to Sprint etc, why is this needed?)
4. Get OTA updates. Will this come automagically because I'm on 4.1.1 and does it matter if my flash counter is gt 1?
5. Root phone via Odin with this file CF-Auto-Root-d2att-d2uc-samsungsghi747.tar.md5.
6. Install CWM if it went away when I went back to firmware - Of course it would because I'll factory reset my phone in step 1.
7. Flash away to a 4.4.4 Rom
Did I miss anything?
Step 4 is the one that scares me -- That one is out of my control. Either I get the OTA or I dont. Anyway I can "request" the OTA?
Thanks again
Be Well

From your custom ROM, run triangle away to reset counter and change things back to official.
Now flash back to stock 4.1.1 using Odin. If your phone does not boot, you need to get into recovery, do a factory reset, and reboot the phone and go through the set up routine.
After loading stock 4.1.1, do this to sim unlock your phone for free: http://forum.xda-developers.com/showthread.php?t=2529200. If you have a code from ATT, you must be running a stock ROM or a custom ROM that is based on a stock Samsung ROM in order to enter the unlock code.
You must be on a stock ROM in order to take OTA updates. OTA updates are the safest way to obtain an updated bootloader and modem.
After updating to 4.3, you cannot downgrade the bootloader as doing so may brick the phone.
The choice is yours in terms of what you want to do. As you found out, some ROMs will not function properly without an updated bootloader and modem. Mixing modem and bootloader versions may also result in a bricked phone.

audit13 said:
From your custom ROM, run triangle away to reset counter and change things back to official.
Now flash back to stock 4.1.1 using Odin. If your phone does not boot, you need to get into recovery, do a factory reset, and reboot the phone and go through the set up routine.
After loading stock 4.1.1, do this to sim unlock your phone for free: http://forum.xda-developers.com/showthread.php?t=2529200. If you have a code from ATT, you must be running a stock ROM or a custom ROM that is based on a stock Samsung ROM in order to enter the unlock code.
You must be on a stock ROM in order to take OTA updates. OTA updates are the safest way to obtain an updated bootloader and modem.
After updating to 4.3, you cannot downgrade the bootloader as doing so may brick the phone.
The choice is yours in terms of what you want to do. As you found out, some ROMs will not function properly without an updated bootloader and modem. Mixing modem and bootloader versions may also result in a bricked phone.
Click to expand...
Click to collapse
To stick with 10.2 or not to that is the question. Everytime I flash or do anything like this on my phone - I get a small lump in my throat knowing I'm dancing in the razors edge of bricking it.

I know how you feel, but I've done it enough times and just accept the fact that I may brick the phone. Jtag service would cost me around $75 so I'm willing to take the chance. I'd be less willing if the phone still has warranty.
Flashing back to stock and running OTA updates is the safest route.
If you don't sim unlock while on stock 4.1.1 and you want to sim unlock your phone in the future, you will need to be on a stock or virtually stock ROM in order to enter the unlock code.

Used ODIN to go back to stock 4.1.1.
Got the OTA update to 4.3
I have my MMS and cellular data back
I'll stick on stock, unrooted 4.3 for a minute.
I should be available to root and update to CM11 or SlimKat or any 4.4 rom whenever I so desire and still keep cellular data.
My baseband is I747UCUEMJB. How can I find out my bootloader and modem versions on UNROOTED device?
Your help is much appreciated and your instructions were flawless.

ddunleavy2 said:
Used ODIN to go back to stock 4.1.1.
Got the OTA update to 4.3
I have my MMS and cellular data back
I'll stick on stock, unrooted 4.3 for a minute.
I should be available to root and update to CM11 or SlimKat or any 4.4 rom whenever I so desire and still keep cellular data.
My baseband is I747UCUEMJB. How can I find out my bootloader and modem versions on UNROOTED device?
Your help is much appreciated and your instructions were flawless.
Click to expand...
Click to collapse
In a terminal or adb shell you can enter this to check your bootloader:
Code:
getprop ro.bootloader
In a terminal or adb shell you can enter this to check your modem (should match the baseband your phone reports in About):
Code:
getprop gsm.version.baseband
I don't believe either of these commands require root unless stock has getprop locked down tighter that AOSP ROMs; I just entered them in a user shell.
There are a couple of firmware updates for your device beyond MJB, NE4 and NJ1. Some users, myself included, had GPS problems that were a bit of a pain to fix on newer 4.4 AOSP based ROMs with the MJB firmware, but data was ok with MJB. Also, you'll need newer firmware if you decide to test drive the lollipop alphas that are floating around. There are custom recovery flashable firmware updates on XDA from a trusted developer if you decide you need that, or you might want to take a couple more OTAs if you're more comfortable going that route. You're already on MJB so there's no going back

The terminal worked
Bootloader and baseband = I747UCUEMJB
What???? I might need more updates for all the roms out there.....ugggh.
"There are custom recovery flashable firmware updates on XDA from a trusted developer if you decide you need that, or you might want to take a couple more OTAs if you're more comfortable going that route."
If I decide to use these flashable firmware updates on XDA from a trusted developer or OTA its same as this: going forward and NEVER going backward when getting firmware updates?, yes?

yes. downgrading bootloader will almost certainly cause a brick.
"all i can really do , is stay out of my own way and let the will of heaven be done"
---------- Post added at 10:09 PM ---------- Previous post was at 10:07 PM ----------
audit13 said:
Data does not work on ROMs beyond cm10.2 because your bootloader and modem to too old.
I recommend flashing back to stock 4.1.1, sim unlock your phone if it is not already sim unlocked, and run OTA updates to at least 4.3, then install recovery and CM11.
Click to expand...
Click to collapse
+1
"all i can really do , is stay out of my own way and let the will of heaven be done"

You guys are on point.
Last night I received another OTA to 4.4.2.
Baseband now at NE4.
Thanks again for taking the time to answer all this -- Really really appreciate it.
EDIT: Can I still use this to root my phone via ODIN or is there a different process for this baseband?
CF-Auto-Root-d2att-d2uc-samsungsghi747.tar.md5
I load this into ODIN, plug my phone in download mode and root away. Does either the file I use change or do I have to use something other than ODIN?
Thanks again

To get root, I would flash a custom recovery and flash supersu from recovery, then let supersu disable know.
The file you named looks to be outdated as it refers to the s3 as d2att. Since unified builds were released, the s3 is now referred to as the d2lte.

I have ROM Manager installed. It has an option to "Flash Clockworkmod Recovery". I just tried it and it failed and I think thats because I dont have root. In the past I've had to root my phone via ODIN, then flash custom recovery then MOD away.
In the past I rooted the S3 via ODIN. With this new 4.4.2 version do I still root via ODIN provide I find the correct file because -> CF-Auto-Root-d2att-d2uc-samsungsghi747.tar.md5 this one is probably for a 4.1.1 version phone?

I would not flash anything for the d2att at this point.
Try this:
Download the latest tar.md5 file from here: https://goo.im/devs/philz_touch/CWM_...Edition/d2lte/
Download supersu zip from here and place it onto an external SD card or copy it to the phone's internal storage: http://download.chainfire.eu/695/SuperSU/
In Odin, uncheck everything except f.reset time. Flash Philz. When you see reset in the status window, remove USB cable, pull battery, replace battery, boot into recovery, flash supersu, reboot.

I am fairly certain that AOSP, or at least CM, de-unified in the past few months. Not that it matters much, other than for the confusion it causes.

[Q] sgh-i747 original updates

Hi all, I have an SGH-i747 with ver 4.0.4 which has been rooted. I will like to update my version systematically with the original updates i believe there where from 4.0.4 to 4.1.1 then 4.1.2. then 4.3, 4.4.2 etcc.. its there a place where i can find the original ups, my phone will not take the original firmware updates on its own. Reason is once i try to flash any ROM pass 4.1.1 i loose the Mobile Data getting the no sim inserted msg and no signal, forcing me to go back the original state in order to work. seems there is a problem with the modem once i go pass 4.1.1. .. thank you.

What bootloader version is on the phone? Where did you get the firmware to flash? You're using desktop Odin to flash?

Are ota updates an option for you? If they are you can unroot and flash the stock recovery; it might be easiest just to Odin back to stock.
Otherwise enewman has posted firmware updates to xda. They are bootloader + modem zips you can flash in custom recovery. You have to flash them incrementally, mjb then ne4 then nj1. Search the forum here and you'll find them. Just be careful and read read read those threads. Messing with bootloaders is the best way to hard brick this phone.

I'm in a similar situation - I've been on a custom version of the Stock ROM for 4.1.2 - never bothered to update the bootloader because I had the soft unlock done, didn't want to lose it. Now I'm bored with it. I'd love to get up to 4.4, or even a 5.0 ROM... but not sure the steps needed to do so. I'm vaguely aware that I have to update the bootloader/kernel, etc... but it seems like I'm 4 years behind the curve with all the ROMs and threads about bootloaders, and I've lost my touch.
That thread with the list of bootloaders sounds good though, I'll go looking for it to start I guess.

gfinockio said:
I'm in a similar situation - I've been on a custom version of the Stock ROM for 4.1.2 - never bothered to update the bootloader because I had the soft unlock done, didn't want to lose it. Now I'm bored with it. I'd love to get up to 4.4, or even a 5.0 ROM... but not sure the steps needed to do so. I'm vaguely aware that I have to update the bootloader/kernel, etc... but it seems like I'm 4 years behind the curve with all the ROMs and threads about bootloaders, and I've lost my touch.
That thread with the list of bootloaders sounds good though, I'll go looking for it to start I guess.
Click to expand...
Click to collapse
Here you go. This TLDR post has all enewman's firmware update threads linked to it.

jason2678 said:
Here you go. This TLDR post has all enewman's firmware update threads linked to it.
Click to expand...
Click to collapse
Thanks! I'll give it a look, down a couple of shots of liquid courage, and give it a go this weekend.
EDIT: Yikes, didn't take long for that to fizzle out. I'm using a i747M. Noticed that my current baseband version isn't listed anywhere on that thread. Hmmm. Oh well, guess I'll do some more digging later...

With an i747m, you can flash the latest 4.4.2 using firmware from sammobile.com and desktop Odin.

Do I need to do them in sequence, or can I jump to the latest? I'm assuming once I've flashed the stock firmware, I can load any current custom ROM?

@gfinockio, is your phone sim unlocked? If not and you don't see any mention of the warranty bit in download mode, you could flash back to stock 4.1.1, use the free method to sim unlock, and then run OTA updates until you are running the latest ROM. OTA updates are the safest route to upgrade the phone.
If you phone is sim unlocked already, you could flash directly to the latest ROM; however, you will not be able to downgrade the bootloader as any attempts to downgrade the bootloader could hard brick you phone.

audit13 said:
@gfinockio, is your phone sim unlocked? If not and you don't see any mention of the warranty bit in download mode, you could flash back to stock 4.1.1, use the free method to sim unlock, and then run OTA updates until you are running the latest ROM. OTA updates are the safest route to upgrade the phone.
If you phone is sim unlocked already, you could flash directly to the latest ROM; however, you will not be able to downgrade the bootloader as any attempts to downgrade the bootloader could hard brick you phone.
Click to expand...
Click to collapse
I used the "free unlock" in 4.1.2 (so it's unlocked) but I thought when you upgraded the bootloader you lost that lock. Now that I believe that isn't the case (and I've used a different tool to unlock as well), I may just try the OTA updates. I was with MTS (Manitoba), but now I'm with Rogers, so I guess I would just use the Rogers OTA images to upgrade from 4.1.2 to 4.4? Do I use Odin or whatever to do that? Once I upgrade to a "stock" image, won't the updater just prompt me to upgrade again and again until I'm "up to date"?

Unlocking the phone via code or the free method is permanent even after upgrading the ROM, bootloader, and modem.
The carrier ROMs for the i747m are pretty much identical but I always recommend sticking with the original carrier's ROM. If you download the stock image from sammobile.com, use Odin to flash the ROM.
OTA updates will not work with a rooted stock ROM too.

When i search for the stock firmware on sammobile for the i747m, it doesn't have any listings. Are you able to find it on there? I don't see it.

Search for the sgh-i747m.

komali2 said:
When i search for the stock firmware on sammobile for the i747m, it doesn't have any listings. Are you able to find it on there? I don't see it.
Click to expand...
Click to collapse
Check here: http://www.sammobile.com/firmwares/database/SGH-I747M/
you can sort by carrier or country.

delete

Rooted SGH-i747 AT&T - want to install stock T-Mobile ROM

I have a Samsung S3 AT&T version, SGH-i747. The phone is rooted and I have the ROM backed up using CWM.
Can I flash this phone with the stock T-Mobile ROM version without any issues (I believe it is T999?).
My goal is to get wifi calling which doesn't come with the ATT model and from what I've read, if I can install the T-Mobile stock ROM or a custom version of it, it will come the wifi calling capability.
Thanks

Hi,
According to my experience, I would say NO.
But you can try it. And if it doent work, revert back to your ROM
By the way I am using custom ROM too on ATT phone.

It may be a matter of semantics, but do not install the stock T-mobile rom. Stock implies you will also be flashing the bootloader and modem. Installing the T999 bootloader and modem on the i747 will brick it. Anything from Sammobile would flash bootloader and modem.
Now, I have seen a number of CM, AOSP, and custom TouchWiz (based on Stock Samsung) ROMs for the i747 that will run on the T999. I would think the reverse would hold true, the T999 ROMs running on the i747. AS LONG AS they do not flash bootloader and modem. BE ADVISED, I have not searched the T999 threads to verify this conjecture. Some doubt enters my mind as I recall that T999 ROMs support AWS while i747 ROMs do not, this may break running them on the i747.

The T999 roms should run fine for the most part. It's safe to flash one to try, just DO NOT flash the firmware as mentioned above.
As for WiFi calling, don't get your hopes up. If I'm not mistaken it's tied into the modem (part of the firmware you cannot flash). So unless you have a T999, WiFi calling won't work.
Sent from my SGH-T999 using Tapatalk

AT&T Galaxy s3 switched to T-mobile = hotspot not working (modem/baseband upgrade???)

AT&T Galaxy s3 switched to T-mobile = hotspot not working (modem/baseband upgrade???)
The phone in question is a 100% stock AT&T galaxy s3.
Android = 4.4.2 Baseband = 1747UCUFNJ2 ROM=Stock
The hotspot worked fine on AT&T's network, quit working once we switched to T-mobile. The phone connects to network just fine (internet works), but when I enable hotspot I get the error "mobile data is off or invalid sim", even tho the mobile data is on and connected. I believe it is due to the baseband/modem but I am not sure?
I would like to upgrade to 1747UCUEMJB or 1747UCUFNE4 but am not 100% of the process and fear bricking the phone (It is not mine).
I remember doing this on a dif s3 a very long time ago, and I had to upgrade to MJB then upgrade to NE4 in succession. Is this still the way to go?
Also, the phone is not rooted and has an older stock recovery. Can I just throw the baseband file on the sdcard, boot into stock recovery and flash? Or should I use Odin?
Also, is there a way to back up the entire phone without a custom recovery or root in case I screw something up? I tried using galaxy s3 toolkit, but when I try to "install an insecure boot image to enable adp" (have to do this to backup it says) it hangs on "waiting for USB debugging to be enabled" even tho it is on for sure.
Thanks in advance for any help guys!

The safest way to update to the latest stock ROM may be to flash a stock ROM from Sammobile.com and run ota updates until the phone is running the latest ROM.
You mention mjb and nj2. Which ROM is on the phone? Mjb is older than nj2.

audit13 said:
You mention mjb and nj2. Which ROM is on the phone? Mjb is older than nj2.
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Baseband = 1747UCUFNJ2
ROM = STOCK
I did not realize MJB is older than NJ2....I suppose I just need to flash NE4 then?
I cannot do OTA updates as it was an AT&T phone and now were on T-mobile and when I try an OTA update it errors out trying to connect to AT&T servers.
TY for your reply!

Is the phone rooted?
Nj2 is newer than ne2 as j comes after e.

audit13 said:
Is the phone rooted?
Nj2 is newer than ne2 as j comes after e.
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Oops I missed that lol, thank ya sir.
So I guess the baseband is not the problem? No it is not rooted.
T-mobile tech support said they couldn't make the tethering and hotspot turn on even though it is active on the account. I have a rooted s3 with cm13 and the tethering and hotspot works fine. But this is my fathers phone and its 100% stock non-rooted. Was just trying to figure how to make the hotspot work, but I have no idea what it could be now if its not the baseband....hmm, thoughts?

If the phone is 100% stock and the baseband is nj2, then the bootloader should also be nj2 as OTA updates and Samsung firmware update both at the same time.
As some s3 owners have discovered, flashing an incompatible baseband or bootloader can hard brick the phone.
You could flash a custom recovery to the phone and then flash a custom ROM to see if that helps. Before flashing a custom ROM, you should backup the existing ROM and all partitions using TWRP in case you want to restore.