yashsingh1/xdaforums huggingface dataset:
[AT&T Samsung Galaxy S 4 General] creepyncrawly:
First of all, baseband is the modem, not the system. Usually, if you still have the MDL baseband, you will have the MDL system and bootloader. You need to double check that. If you still have MDL system and bootloader, your phone is still customizable with Loki, custom kernels and custom firmware, so if this is important to you, you may want to avoid upgrading. All more recent versions of the firmware are fully locked and you will be restricted to the stock kernel and only touchwiz based custom firmware.

That being said, you can install the current firmware without issues. You will need to flash the full version of the firmware, which is I337UCUFNB1 4.4.2 KitKat. From there, you can upgrade to 4.4.4 or 5.0.1 versions of the OS if you want.

See [INDEX] All things AT&T [MK2 NB1 NC1 NI1 NJ4 NJ5 OC3 OC4] and ROM List for additional information.
[AT&T Samsung Galaxy S 4 General] TravisMaddox:
Thanks for your reply and help :)

So,if I flash this on my phone,I won't have any issues like bootloop,or brick or baseband issues?

Just confirming..
[AT&T Samsung Galaxy S 4 General] creepyncrawly:
Please read the first few posts in this thread thoroughly until you understand them. Always best to know exactly what you are doing before you act.

Quoting from post #1:

and from post #2:

So, as I said, if Loki is important to you, don't flash this or you'll "be locked down for good." And yet you can flash NB1 from ANY BASE.

Now, that being said, I do not own this phone, and I have not tried flashing to NB1 from MDL. I have only ever flashed one S4 and it was from a custom rom to NB1, and that went smoothly.
[AT&T Samsung Galaxy S 4 General] Mikeandrd2292:
I have no phone service so whenever I get the NJ4 update and Odin the NC1 kernel, there's no WiFi connection or data so towelroot won't connect to the internet. What to do?
[AT&T Samsung Galaxy S 4 General] TravisMaddox:
Ok..I don't mean to annoy you but I don't know what Loki is. And what happens if I get stuck on stock kernel? And what harm will locking my bootloader do?
[AT&T Samsung Galaxy S 4 General] creepyncrawly:
There was an exploit for the original phone bootloader that allowed people to bypass the bootloader. It is called LOKI. It allowed people to install a custom kernel and thus they could load AOSP based roms. This was only on the original MDB and MDL bootloaders.

Since the MK3 update, the exploit was fixed and there has been no way to bypass it. Thus, the only kernel that can be installed on the phone is the stock kernel. There are ways to install custom Touchwiz based roms that will run with the stock kernel, but no AOSP based roms can be installed.

It sounds like this would be of no consequence to you. If you wish to update the phone to the latest stock firmware, or even install a custom touchwiz firmware, as far as I know, you should be able to do so with no issues as long as you follow the guides.
[AT&T Samsung Galaxy S 4 General] Marco Paulo:
From OC3 to NJ4/NJ5

Hi,

First, congratulations on the excellent work.

As a newbie, I wonder if it is as simple as it seems the "downgrade" from OC3 to NJ4 / NJ5.

After the Lollipop update, I lost the permissions to include locales, which was possible with the More Locale 2 in previous releases.

I have tried different app's with no success.

I'm not in stock OC3. I successfully rooted my phone with "Kingroot" desktop version.

Thanks for any help.
[AT&T Samsung Galaxy S 4 General] guut13:
It is because for wifi to work, the kernel needs to match the modules. Normally cellular data is enough to connect to towelroot for this step, but if you have no reception, you can try flashing the NC1 modules. Make sure to flash the NJ4 module after re-applying the NJ4 kernel.

Thank you.

The only 'downgrade' method I am aware of is Odin back to NB1 stock and then taking the updates to get to NJ5. You WILL loose all your data. Doesn't matter if you are rooted, either. Your current image will get blown away when stock nb1 is loaded.
[AT&T Samsung Galaxy S 4 General] TravisMaddox:
I don't want to do anything related to AOSP roms. So, I guess,even if my bootloader gets locked,I will be able to flash this Lollipop ROM on my S4 AT&T I337UCUAMDL with 0 problems. Right? This was my last question.

---------- Post added at 08:39 AM ---------- Previous post was at 08:34 AM ----------

And the guide said users with MDL bootloaders should NOT use this guide. Can I still use it if locking my bootloader does not affect me?
[AT&T Samsung Galaxy S 4 General] Marco Paulo:
Thank you for your quick response.

I will try this method and wait for someone who gets the instalation of new locale in the Lollipop.

:fingers-crossed:

:good::good:
[AT&T Samsung Galaxy S 4 General] guut13:
Yes. Go for it.
[AT&T Samsung Galaxy S 4 General] TravisMaddox:
Okay,thanks. What's towelroot and safestrap? Do I need them or can I just download the NB1 Kitkat ROM file and Odin and flash it on my S4?
[AT&T Samsung Galaxy S 4 General] creepyncrawly:
If you want straight stock without root or any customization, then you do not need those tools. Towelroot is the tool used to add root access to the NB1 base, and safestrap is the tool that is used to load custom firmware, and do other tasks.
[AT&T Samsung Galaxy S 4 General] stabber5000@gmail.com:
Can system rom be done without computer?
[AT&T Samsung Galaxy S 4 General] guut13:
Can a system rom be flashed without a computer? Sure.

Can you make your own system rom without a computer? You can backup your system in recovery, but if you want to start making custom roms, you'll probably need a computer.
[AT&T Samsung Galaxy S 4 General] atenspro:
Downgrade from Lollipop to Jellybean

I can see that you can go straight to BN1 from OC4, but can I go straight to Jellybean from Lollipop?

Thanks in advance - atenspro
[AT&T Samsung Galaxy S 4 General] guut13:
No...

HOW TO GET TO JELLY BEAN 4.3 (MK2) BASE

NOTES

You can go to MK2 from MLD, MK2, and earlier. Once you flash NB1, you CANNOT go back to MK2.
​
[AT&T Samsung Galaxy S 4 General] atenspro:
I haven't flashed to NB1

I saw that in the original posting.

But since I haven't flashed to NB1 I was just wondering if there was any direct path to downgrade to Jellybean.

The statement you quoted is what made me think to ask the question.

Thanks -atenspro
[AT&T Samsung Galaxy S 4 General] guut13:
That means you are either...

1. Still on Jelly Bean. If so, then once you take the Kitkat update you will not be able to go back to JB.

2. Got your phone with Kitkat or Lollipop already installed. If so, then you are past the NB1 base and cannot go back to Jellybean. KitKat is the earliest you can go back to if you do not like Lollipop.
[AT&T Samsung Galaxy S 4 General] atenspro:
Thanks for the clarification!

:good:
[AT&T Samsung Galaxy S 4 General] TheJuli:
Im on Stock NB1 and rooted. If i flash the 4.4.4 update will i lose root, or **** my device up?
[AT&T Samsung Galaxy S 4 General] guut13:
Depends how you rooted. Most likely the update will fail. Small chance that the update will success, but you will loose root.
[AT&T Samsung Galaxy S 4 General] mcpgio94:
It´s a root option for 5.0.2?

Hey, I have a question... I dont know if stay on 4.4.4 for root or update to 5.0.1, I´m no sure if update its root available...

---------- Post added at 05:21 PM ---------- Previous post was at 05:09 PM ----------

Hey, I have a question... I dont know if stay on 4.4.4 for root or update to 5.0.1, I´m no sure if update its root available...
[AT&T Samsung Galaxy S 4 General] creepyncrawly:
If you update over-the-air you will lose root. If you want Lolipop and keep root see [How-To] Update to I337_OC4 - 5.0.1 and KeepRoot.
[AT&T Samsung Galaxy S 4 General] N54:
Is there a way I can get a custom recover on my phone and get cm11?

If not can I at least downgrade to stock 4.2.2?
[AT&T Samsung Galaxy S 4 General] guut13:
You can root lollipop.

No and no. Sorry.
[AT&T Samsung Galaxy S 4 General] N54:
Going to double check one more time.

From googling it seems that people are able to downgrade ATT 5.0.1 to 4.4.2, why wouldn't I be able to downgrade ATT 4.4.4 NJ5 to ATT 4.2.2 ? The sim card issue is killing my phone and I also believe 4.2.2 was much faster than 4.4.4 on my SGH-I337
[AT&T Samsung Galaxy S 4 General] creepyncrawly:
4.4.2 is as far back you can go due to the nature of the locked bootloader, which will not allow you to regress the bootloader.
[AT&T Samsung Galaxy S 4 General] N54:
Screw it, nexus 6p ordered. Too many issues with this device. Going to miss the multi-window and swap-able battery. But not much else. So tired of ATT & Samsung's backroom schemes.

If I can get my simcard issue to go away... I might keep it. Have people already tired downgrading to 4.4.2 to solve the sim card removed error message?
[AT&T Samsung Galaxy S 4 General] N54:
Can I take ATT 4.4.4 NJ5 to non-ATT 5.0 ?
[AT&T Samsung Galaxy S 4 General] Vinao:
I tried to update my i337 MDL 4.4.2 to 5.0.1 and got a problem

then I tried to use odin to restore the original firmware

but I did not read this warning

"SGH-I337 users with a MDB or MDL bootloader. (Don’t use this guide or you’ll be locked down for good.)"

Can somebody help? I cant restore using TWRP, Kies, and I not really sure why Odin gives an error too.

Thanks
[AT&T Samsung Galaxy S 4 General] guut13:
Not sure what you mean by non-ATT. You can only odin ATT factory images listed in post 2.

If you want to run an non-ATT base, first, upgrade to an ATT Lollipop Factory Image, then flash an i9505 based ROM. List of compatible ROMs can be found in post 3 here...

http://xdaforums.com/showthread.php?t=2616221

Reason that warning is there...

You have an bootloader which can be loki'd to flash any kernel. If you follow any of the directions above, your bootloader will be permanently locked and you will be stuck with stock kernel.

Glad to help, but I'll need more info. What error did you get? In general...

If you have any issues or Odin does not see your device...

1. Try a different USB cable

2. Try a different USB port on your PC

3. Uninstall Kies. (Kies sometimes interferes with Odin)

4. Download the latest drivers from the Samsung website. (Uninstall the existing drivers from your PC, reboot, and then install the new drivers.)
[AT&T Samsung Galaxy S 4 General] Vinao:
Thanks for your help bro.

I did follow one of the instructions and flashed Odin to NB1 Stock.

When I try to install the original firmware Odin and Kies give an error and it fails

something like: SW REV CHECK FAIL : Fused 5 Binary 1

And when I try with TWRP (pwr+home+up) there is an error like E:failed to mount /system (invalid argument)

If i try to flash a custom rom it says e: footer is wrong

e: signature failed

I guess I really ****ed this up.
[AT&T Samsung Galaxy S 4 General] guut13:
Well, TWRP isn't going to do anything with these Odin files. and the fused error is seems like something you'd get when you try to downgrade and flash an earlier base.

At this point, I think you have lost your MDL base. This is what I recommend (and it WILL lock down your bootloader)...

1. Uninstall Kies

2. Uninstall Samsung Drivers

3. Reboot

4. Install latest driver from here... http://www.samsung.com/us/support/owners/product/SGH-I337ZWAATT

(DO NOT INSTALL KIES)

5. Follow direction in... "STEP 1 - Odin to NB1 Stock"

(make sure to re-download Odin and the NB1 base, just in case they got corrupt the first time around)
[AT&T Samsung Galaxy S 4 General] syco87:
Marshmallow?

Hi guut13,

I know this is a bit off-topic, but do you think us Galaxy S4 owners will see some unofficial Marshmallow love?

I say unofficial because according to my Google research on the topic, it looks like Samsung/AT&T is not going to be putting out an official Marshmallow update for the S4.

So I guess it's down to magicians like you now :o

Possible?? :fingers-crossed:

Thanks!
[AT&T Samsung Galaxy S 4 General] Vinao:
It worked thanks a lot man, I lost root after the process.

Now its like this
[AT&T Samsung Galaxy S 4 General] guut13:
haha... Magician, huh? Don't know about that, but I appreciate the nod.

Only way Safestrapped users will get Marshmallow is if AT&T releases it. Why, because the locked bootloader means you will never be able to change your kernel. Same reason you can't run lollipop roms until you upgrade your base to ATT stock lollipop, first.

Sweet. Glad it worked. Now just follow the rest of the steps to get where you want to go.
[AT&T Samsung Galaxy S 4 General] uselesspablo:
Hi I have a question, I'm from argentina I have a sgh-i337 if I change the kernel to root the phone, could I lost 4g networks and wifi or dosn't affect ? Thanx for replys

Enviado desde mi SAMSUNG-SGH-I337 mediante Tapatalk

---------- Post added at 12:44 PM ---------- Previous post was at 12:02 PM ----------

I'm in stock kitkat 4.4.2

Enviado desde mi SAMSUNG-SGH-I337 mediante Tapatalk
[AT&T Samsung Galaxy S 4 General] guut13:
You shouldn't loose cellular network, but you will loose wifi. Then, once you are rooted, flash the base kernel back and you'll be back in business with wifi working.
[AT&T Samsung Galaxy S 4 General] uselesspablo:
Thanx, I'm root

Enviado desde mi SAMSUNG-SGH-I337 mediante Tapatalk
[AT&T Samsung Galaxy S 4 General] uselesspablo:
Hi, I have root and safestrap installed, I'm on stock kitkat ucufni1 can I install any rom without lost my wifi and net conection ? Thanx again

Enviado desde mi SAMSUNG-SGH-I337 mediante Tapatalk
[AT&T Samsung Galaxy S 4 General] guut13:
Yes, as long as you follow the ROM install directions and make sure to flash the modules that match your base after flashing ROM.
[AT&T Samsung Galaxy S 4 General] uselesspablo:
Thank you very much. Lollipop too ?

Enviado desde mi SAMSUNG-SGH-I337 mediante Tapatalk
[AT&T Samsung Galaxy S 4 General] kenshin27:
Help needed

Ok so I've been trying these instructions out and have managed to get my S4 back to KitKat 4.4.2 NB1. But I can't seem to install any base after that. Every time I copy the base update zip file to my SD card and then reboot, the file disappears so I can't find it when I boot in recovery mode. Something is deleting it either upon shutdown or start up. If I go into My Files after I boot up again, the zip file is gone. Anyone have any idea what's going on here? Thanks in advance!
[AT&T Samsung Galaxy S 4 General] guut13:
Yes.

Just to confirm, you are copying to External SD, not Internal, right?

Try making a folder called updates and put it there. It doesn't have to be at root level because you can browse to it.
[AT&T Samsung Galaxy S 4 General] kenshin27:
Yes I'm copying to external SD. I tried copying to internal just to test and the file doesn't disappear there but you also can't run recovery from internal.

And unfortunately I've already tried copying to existing folders in my SD and that didn't work either (even two levels down). I don't know how/what it is that's removing it and it's driving me nuts.
[AT&T Samsung Galaxy S 4 General] bwischmeier:
Troubles/concerns

Would this method work with MDF v1.0 Release 2? I rooted my at&t galaxy s4 a while back with towelroot then uninstalled root in the hopes of receiving ota's. No such luck. Phone always prompts me there is a software update but it always fails at 25% in the installation process.
[AT&T Samsung Galaxy S 4 General] guut13:
Sorry. Not sure why it's happening. I thought someone else had a similar issue and posted it in the thread, but I can't find it. Do you have another SD card you can try? If so, format it first with the phone and then upload and test the file.

Not familiar with MDF v1.0. I'm assuming that is a version you are seeing in the settings? It shouldn't make a difference as I'm guessing all other i337 phones share it.

Depending on how you root your phone, system files get added and changed. Unrooting alone, doesn't always undo that. You'll need to odin back to stock and then upgrade.
[AT&T Samsung Galaxy S 4 General] guut13:
Not sure you are still having an issue, but I tested and confirmed a work around... sideload using ADB

In order for this to work, you'll need adb installed and the OTA update zip file on your PC. (If you are familiar with adb... great. If not, there are plenty of great threads on XDA that can help you get it installed.)

1. Boot into stock recovery on your phone

2. Select... apply update from ADB

3. Connect phone to pc

4. On pc, test to make sure phone is being seen... adb devices

5. If seen... adb sideload {OTA zip}
[AT&T Samsung Galaxy S 4 General] MA52:
Hello everyone

I have unlocked s4 i337 with stock NC1 not rooted, can i proceed with the nj4 update in recovery and then to OC3 lollipop? or should i first odin back to NB1 first and then Nj4 -> OC3?

thanks
[AT&T Samsung Galaxy S 4 General] Organized_Chaos:
My friend has an i337 that has been updated to OC4 (5.0.1) and does not have root access. Can we go back to NB1 from that as well? I know this says you can go back from ANY base but the examples just say OC3 and earlier.
[AT&T Samsung Galaxy S 4 General] guut13:
As long as you haven't rooted in the past and then unrooted... you should be fine.

Probably not a bad idea to copy off anything important, just in case.

Yep. No problem double checking... Any base. I have it listed as a note in the Kitkat instructions, but I'll I'll update that example to avoid further confusion.
[AT&T Samsung Galaxy S 4 General] Maury000:
I have managed to borrow a PC so I could download Odin3 v.3.09 and the TWRootable, etc. for my I337 5.01, but the drivers failed to install. I read somewhere what to do in that case, but can't find it again. Can anyone help? ~Thanks
[AT&T Samsung Galaxy S 4 General] guut13:
Can you provide more detail on the "failed to install"?

General troubleshooting...

1. Open control panel > add/remove programs. If there, uninstall kies and samsung drivers.

2. Reboot.

3. re-download latest driver from samsung... http://www.samsung.com/us/support/owners/product/SGH-I337ZWAATT

4. try install again
[AT&T Samsung Galaxy S 4 General] Maury000:
Success!!!

Thank you, thank you, thank you!!! I managed to get the drivers downloaded, and sure enough, now Odin recognizes my phone. So I have successfully downgraded to 4.4.2 using your impeccable guide! :good::good:

Now I'm going to try to root it, then upgrade back to lollipop, while maintaining root. Here goes. . . !

---------- Post added at 07:25 PM ---------- Previous post was at 07:07 PM ----------

Wait! I was about to skip step 2 (Flash Updates) before rooting. Can someone help me to understand what these updates are, and how i can make the right choice? ~Thanks
[AT&T Samsung Galaxy S 4 General] guut13:
Glad you are back on track. If your goal is to get to Lollipop, then it doesn't matter what Kitkat base you get to, as long as you can root it. Might as well go to NC1, since it's the easiest to root of all the updates. Once you have rooted NC1, follow this guide to get you to a Rooted Lollipop Base...

http://xdaforums.com/galaxy-s4-att/general/how-to-update-to-i337oc3-5-0-1-keeproot-t3075814

If you want to flash Lollipop ROMs, this thread is also helpul...

http://xdaforums.com/galaxy-s4-att/...led-custom-lollipop-rom-t3135396/post61352064
[AT&T Samsung Galaxy S 4 General] Maury000:
What an amazing ride I've been on, and it's mostly thanks to you, guut13!! I managed to obtain root yesterday, and it took a while to get clear on how to do the next few steps, what with downloading FlashFire, and whether to flash the deodexed or the odexed. I finally settled on the odexed and went for it. Lo and behold, IT WORKED!! I now have root on my Galaxy S4 i337 v5.0.1!!! Thank you again and again!!
[AT&T Samsung Galaxy S 4 General] Maury000:
OK, I decided to go ahead and install Safestrap v3.72, and I got a window with options to "install recovery" or "uninstall recovery". Now is the time for me to learn what recovery is, so I have no false assumptions and mess up. What happens when I click "install recovery"? --Recovery of what, exactly?
[AT&T Samsung Galaxy S 4 General] guut13:
Installing the safestrap apk only installs the APP. Clicking "install recovery", installs the actual recovery.

If you click uninstall recovery, before installing recovery... nothing will happen.
[AT&T Samsung Galaxy S 4 General] Maury000:
Thanks for the info, and I'm so relieved you came back here. I went ahead and followed the instructions here: http://xdaforums.com/galaxy-s4-att/general/how-to-installed-custom-lollipop-rom-t3135396:

>I downloaded Goldeneye v53 in step 4.1.1

>I did steps 4.2.1, 4.2.2, 4.2.3, 4.2.4, and 4.2.5.

>Then I wiped and performed factory reset. (4.3.1)

THEN, when I went to flash The ROM, Goldeneye, I realized I had forgotten to place it onto the SD! After lots of consideration and checking out some of the possibilities on SS, I tried to install the stock rooted OC4 zip file I saw on the

SD card, but nothing happened. I didn't add any extra zips there, because I assumed they are for Goldeneye,

Anyway, now I'm stranded in SS and can't seem to get out. I managed to power it down, but now it buzzes every 4 seconds. If I power it on again, SS (disabled will come up again. I don't know what to do. The instructions there were not as thorough as yours, and a little dated. Right now, though, I really need to get my phone working again. Do you have any ideas? ~Thanks
[AT&T Samsung Galaxy S 4 General] Maury000:
I came up with one possible solution for my problem - if it can be done! I thought I could take the 64GB SD card out of the S4 (it has no OS now, so it may be OK), the insert it in my S2 (extra phone), THEN insert the GoldenEye ROM zip file, then re-insert it in the S4, THEN figure out how to flash it using Safestrap, and perhaps I'll have a functioning phone again!!

HOWEVER, my S2 is not geared for a 64GB SD card, so I need to know if there's a way I can have it accept it without having to format it. Does anyone have any suggestions?
[AT&T Samsung Galaxy S 4 General] jmjoyas:
You should simply be able to put the phone in download mode and flash the full NB1 using odin
[AT&T Samsung Galaxy S 4 General] Maury000:
Thank you so much!! You are a lifesaver! And I've learned so much here. So now I've done that, then rooted again with TR, then flashed OC4 stock rooted ROM. Now I'm going for the Gold again (GoldenEye)! This time I'm going to read and re-read, check and double check before I go into Safestrap again.
[AT&T Samsung Galaxy S 4 General] Osirus71:
Hello. Im helping out a friend of mine that owns the ATT S4....He want to get back to stock, so I was going to Odin the latest stock image from SamMobile...This is the one that I am downloading from there: I337UCUAMDL_I337ATTAMDL_ATT.zip

Can anyone verify this is the correct file to Odin with????? Thanks so much for any info....Also, if anyone has the image, could i please get a link??? The SamMobile site is soooo slowwwww.......
[AT&T Samsung Galaxy S 4 General] guut13:
That will only work if your friend bought their phone when it was first released and NEVER updated it. Once you update, you can't go back.

If you are not sure, then I recommend follow the steps in the OP, which also include links to the files you need.
[AT&T Samsung Galaxy S 4 General] Osirus71:
Thanks so much for your quick reply...So just to be on the safe side, I should do the following steps????

1. Odin I337UCUFNB1_4.4_Stock_Odin_tar

2. Copy the following files to Internal memory and flash through Factory Recovery in sequential order....

NJ4_update_from_NB1.zip

OC3_update_from_NJ4.zip

OC4_update_from_OC3.zip

I dont know what he is currently running because I cant get into the OS but I can get into recovery...Boot shows "Samsung custom" and an unlocked padlock. This happened after he chose to do a factory reset from Setting inside the OS....

Again, Thanks for the info.....:good:
[AT&T Samsung Galaxy S 4 General] guut13:
You got it. Steps look good.