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[Q] [HELP] AT&T Galaxy S4 I337 Network Unlock

Can someone give clear instructions on how to Network unlock my completely stock Galaxy S4 I337? I've read all sorts of different methods and none of them have worked. So far, I have tried (unsuccessfully) the following:
- Using the *#27663368378# method, does not do anything
- Using the *#0011# method, does not take me to the UMTS menu
- Using the *#9090# method, does not take me to the UMTS menu
- Using the *#*#197328640#*#* method, takes me to the DEBUG SCREEN in the UMTS menu but Option 6 (PHONE CONTROL) is not there
- Using 'Samsung Service Mode' app method (google search for "samservicemode" it's the first XDA link), takes me to the DEBUG SCREEN in the UMTS menu but Option 6 (PHONE CONTROL) is not there
One thread I saw mentioned that the modem / modem drivers have something to do with the menu options not being there but didn't offer much else.
Is there a tried and true proven method to Network unlock an AT&T 32GB Galaxy S4 I337? My phone's basic info is attached.

Call AT$T and have them give you the unlock code. I did this and was the easiest way.

malikhassaan said:
Can someone give clear instructions on how to Network unlock my completely stock Galaxy S4 I337? I've read all sorts of different methods and none of them have worked. So far, I have tried (unsuccessfully) the following:
- Using the *#27663368378# method, does not do anything
- Using the *#0011# method, does not take me to the UMTS menu
- Using the *#9090# method, does not take me to the UMTS menu
- Using the *#*#197328640#*#* method, takes me to the DEBUG SCREEN in the UMTS menu but Option 6 (PHONE CONTROL) is not there
- Using 'Samsung Service Mode' app method (google search for "samservicemode" it's the first XDA link), takes me to the DEBUG SCREEN in the UMTS menu but Option 6 (PHONE CONTROL) is not there
One thread I saw mentioned that the modem / modem drivers have something to do with the menu options not being there but didn't offer much else.
Is there a tried and true proven method to Network unlock an AT&T 32GB Galaxy S4 I337? My phone's basic info is attached.
Click to expand...
Click to collapse
Check this thread out.....http://forum.xda-developers.com/showpost.php?p=48961319&postcount=3 work for me right away..........as long as u have Root access ( Jortex or Kingo ) both seem worked and install Regionlockaway app from OP.....then reboot.....I tested by switched to T-Mobile SIM CARD .....in and out going call worked.....mms also work.....:good:

ted77usa said:
Check this thread out.....http://forum.xda-developers.com/showpost.php?p=48961319&postcount=3 work for me right away..........as long as u have Root access ( Jortex or Kingo ) both seem worked and install Regionlockaway app from OP.....then reboot.....I tested by switched to T-Mobile SIM CARD .....in and out going call worked.....mms also work.....:good:
Click to expand...
Click to collapse
Is there any sure-fire way without root?

I have had the same problem.
I have not found a way to sim unlock my phone.

The easiest way is to call AT&T and tell them that you will be traveling in Europe and need your phone unlocked. AT&T is generally willing to provide an unlock code in this situation.
If you wish to unlock it yourself, have a look at my post that gives you options when the necessary Samsung menu item appears to be missing. It's not usually missing.. just moved to a different sub menu: How to unlock..
.

I tried following steps and my at&t phone is unlocked. Tried with T-mobile sim as well as international sim.
Possible method to SIM unlock on MK2 *must be rooted*
1. Rooted my s4 on MF3 using following method.
New Root Method for AT&T Samsung Galaxy S 4 (OTA MF3 + Safe update to MK2)
HOWTO:
Use a card reader to format the micro SD card to exFAT (FAT32 or other formats does not work) in Windows. I haven't tried Linux or MacOS X, so they may not work.
Download the attached file (Root_for_ATTSG4_FM3.rar) and extract it into the root of your EXTERNAL microSD card using the card reader in Windows. (You can do the extraction using WinRAR or 7-zip).
Put the SD card back to the phone and download the Android Terminal Emulator app.
Open the Terminal Emulator app and run below 3 commands:
Code:
cd /mnt/extSdCard
./pwn
./script.sh
Then, open SuperSU and check everything looks good.
Then open a root app and it should be working properly.
Reboot your device once to confirm root is still working after reboot.
Come back to the post and press the THANKS button
Click to expand...
Click to collapse
2. Install Recovery using following method. Follow MF3 saferoot method
[RECOVERY LOCKED] Safestrap Recovery v3.71 [2013-12-27 EXFAT Fix]
FOR USERS OF MF3 (TW4.2):
LATEST FILE: Safestrap-JFLTEATT-3.65.apk (updated 2013-11-15)
Main XDA Downloads Page
Mirror 1 (Goo.im): http://goo.im/devs/Hashcode/jflteatt/safestrap
HOW DO I INSTALL SAFESTRAP?
Requirement: Root
Requirement: Allow APK install from Unknown Sources
Download the Safestrap APK
Find the APK using a Filemanager tool and open it on your device, then click "Install".
(If updating from an existing Safestrap you might be warned that this will over-write the existing installation. Click the "Yes" equivalent to this message.)
Once installed, open up the Safestrap application as you would any other app.
Agree to the disclaimer that you won't try to sue me and hunt me down with a rifle if you manage to break your phone..
Then use the "Install Recovery" button. You should see the current version down in the lower left corner of the window. And the "Status:" should say "Installed" when you're done.
From there you can reboot and you *should* see a new splash screen during the boot up. While this is showing you can enter Safestrap Recovery using the [ menu ] button.
That's it for the installation! Read below for a brief overview of Safestrap Recovery v3.x
Click to expand...
Click to collapse
3. Unlocked using following thread. I used method-2 (I flashed modems using safestrap recovery instead of odin)
Possible method to SIM unlock on MK2 *must be rooted*
Method 2 (posted by muniz_ri)
Alternatively, I337 owners can flash the MDL modem via Odin to re-gain access to the hidden menu(links to signed, odin flashable modems below) then follow the guide in the OP to unlock your phone. Once completed you can re-flash the MK2 modem. I tested this process on my own stock i337 running stock MK2 and it works but follow at your own risk. Also, my knox warranty flag has been tripped for a long time so I don't know if flashing the MDL modem will trip the flag or not. Someone else can chime in on that. Cheers:
MDL Modem: https://mega.co.nz/#!wpUUXQCS!Aws3S1...BTVaEvIzcd3t6M
MK2 Modem: https://mega.co.nz/#!pwESna5I!YK7EKG...9t2EdMK9ofgJKg
Click to expand...
Click to collapse
To finish this method go to this thread:
http://forum.xda-developers.com/show....php?t=2285431
*muniz_ri has stated he is not sure whether this will trip KNOX or not*
Thanks to RockRatt and deadlysin9 for letting me know it was safe to just flash modems while on MK2 rooted[/QUOTE]

xisruno said:
Call AT$T and have them give you the unlock code. I did this and was the easiest way.
Click to expand...
Click to collapse
AT&T has strict guidelines on unlocking their phones.
https://www.att.com/deviceunlock/client/en_US/?
I did not pass the requirements.

urtruelove78 said:
I tried following steps and my at&t phone is unlocked. Tried with T-mobile sim as well as international sim.
Possible method to SIM unlock on MK2 *must be rooted*
1. Rooted my s4 on MF3 using following method.
New Root Method for AT&T Samsung Galaxy S 4 (OTA MF3 + Safe update to MK2)
2. Install Recovery using following method. Follow MF3 saferoot method
[RECOVERY LOCKED] Safestrap Recovery v3.71 [2013-12-27 EXFAT Fix]
3. Unlocked using following thread. I used method-2 (I flashed modems using safestrap recovery instead of odin)
Possible method to SIM unlock on MK2 *must be rooted*
To finish this method go to this thread:
http://forum.xda-developers.com/show....php?t=2285431
*muniz_ri has stated he is not sure whether this will trip KNOX or not*
Thanks to RockRatt and deadlysin9 for letting me know it was safe to just flash modems while on MK2 rooted
Click to expand...
Click to collapse
[/QUOTE]
Confirmed working on MK2 i337

fffft said:
The easiest way is to call AT&T and tell them that you will be traveling in Europe and need your phone unlocked. AT&T is generally willing to provide an unlock code in this situation.
If you wish to unlock it yourself, have a look at my post that gives you options when the necessary Samsung menu item appears to be missing. It's not usually missing.. just moved to a different sub menu: How to unlock..
.
Click to expand...
Click to collapse
Called at&t today and they are asking for account number which I do not have. What now?

mbison83 said:
Called at&t today and they are asking for account number which I do not have. What now?
Click to expand...
Click to collapse
If you don't have an account with at&t they are not going to give you a code. Either try the free unlock or buy a code.
Just a heads up on the free unlock, generally if you try it too many times you will be permanently unable to unlock. So if it doesn't work the first couple of times give up
Sent from my Nexus 5

jd1639 said:
If you don't have an account with at&t they are not going to give you a code. Either try the free unlock or buy a code.
Just a heads up on the free unlock, generally if you try it too many times you will be permanently unable to unlock. So if it doesn't work the first couple of times give up
Sent from my Nexus 5
Click to expand...
Click to collapse
The free way does not work for me as I am not able to access the Phone Control feature (possibly because of the 4.4.2 OS which I have heard has some features to prevent users from unlocking a device).
I am having the previous owner and at&t customer to call and request the code. Will know whether they will release the code in 48 hours.
If that doesn't work I will have to buy a code. Any recommendations?

I have used cellunlocker.net many times and couldn't be happier (except for the price lol)
Sent from my SAMSUNG-SGH-I337 using XDA Premium 4 mobile app

Help
I have a smiler problem but not the same I accidentally hit the option 1 debug screen in the service mode on the the same device (s4)active and it cleared the entire menu and now it won't read any sim and there is no mobile network to be found and all I get is a circle with a line in it . Any help would be greatly appreciated

Rooted(Kingo root). Unlocked using Regional lock away. Popped in a Verizon sim that is currently active. But no signal. I am only getting signal strength. But the good part is that i am not getting the sim unlock anymore. Basically telling me its unlocked.
Now i am trying to get service. I can't even connect to 611. Not sure if i have to flash the radio. Or add to my Verizon acct via imei #
Please help!
Sent from my Portable

helijersey said:
Rooted(Kingo root). Unlocked using Regional lock away. Popped in a Verizon sim that is currently active. But no signal. I am only getting signal strength. But the good part is that i am not getting the sim unlock anymore. Basically telling me its unlocked.
Now i am trying to get service. I can't even connect to 611. Not sure if i have to flash the radio. Or add to my Verizon acct via imei #
Please help!
Sent from my Portable
Click to expand...
Click to collapse
Most likely you have an apn issue. Check your apn and make sure it's correct for Verizon
Sent from my Nexus 5 using XDA Free mobile app

jd1639 said:
Most likely you have an apn issue. Check your apn and make sure it's correct for Verizon
Sent from my Nexus 5 using XDA Free mobile app
Click to expand...
Click to collapse
Where do i start? Apn?
Sent from my Portable

helijersey said:
Where do i start? Apn?
Sent from my Portable
Click to expand...
Click to collapse
Go to settings, wireless &.networks, more, cellular networks, access point names. Google Verizon apn settings for the correct settings.
Sent from my Nexus 5 using XDA Free mobile app

Ty! JD1639 i got the apn setting and created a new apn saved. But never saved, tried twice. Is there something i am missing?
Sent from my Portable

helijersey said:
Ty! JD1639 i got the apn setting and created a new apn saved. But never saved, tried twice. Is there something i am missing?
Sent from my Portable
Click to expand...
Click to collapse
It's been awhile since I edited a vpn but I remember I had the same issue. After you edited a line did you save it? There are three dots in the upper right hand corner of the phone, press them. The save option is in there.
Sent from my Nexus 5 using XDA Free mobile app

help with bootloader needed

hi guys im new to this but am catching on some what quick but ive got a stumble on my hands. so i've rooted my phone through towelroot successfully. now im trying to load a custom rom but cant access my boot loader. when i try to access it with the button combo it gives me a kernel error and say something like system doesn't allow this process, something like that. so i was wondering if someone knows the right way to unlock my boot loader, or tell me how to figure out if mine is updated too far and they have patched it. thank you
my phone
model - samsung sgh-i337
version - 4.2.2
baseband - i337ucufnc1
kernel - 3.4.0-1125940
build - kot49h.i337ucufnc1

tshaulis said:
hi guys im new to this but am catching on some what quick but ive got a stumble on my hands. so i've rooted my phone through towelroot successfully. now im trying to load a custom rom but cant access my boot loader. when i try to access it with the button combo it gives me a kernel error and say something like system doesn't allow this process, something like that. so i was wondering if someone knows the right way to unlock my boot loader, or tell me how to figure out if mine is updated too far and they have patched it. thank you
my phone
model - samsung sgh-i337
version - 4.2.2
baseband - i337ucufnc1
kernel - 3.4.0-1125940
build - kot49h.i337ucufnc1
Click to expand...
Click to collapse
your bootloader can not be unlocked. You can not use a custom recovery. The only thing you can do is to use safestrap and ROMs compatible with safestrap.
Search this forum for Hashcode's safestrap thread and read the whole thing and then decide if you want to do it.

RK said:
your bootloader can not be unlocked. You can not use a custom recovery. The only thing you can do is to use safestrap and ROMs compatible with safestrap.
Search this forum for Hashcode's safestrap thread and read the whole thing and then decide if you want to do it.
Click to expand...
Click to collapse
actually im trying safestrap right now and i've installed it and it says successfully installed but my status is still inactive and when i tried rebooting to booloader it still says it wont allow it. its like the other one i installed is still on there and i cant write over it, do you know where i could find it and delete it? I'm pretty sure thats my problem is that i have the other one is whats stopping me from going any further.

Just trying to unlock phone, USB and Wifi are not working after rooting with Odin3

I tried follow 2 separate quick or auto-root guides for this phone, but after performing the room, I am no longer able to access the device via USB or use the WI-FI on the device. The Wi-Fi gives an invalid sim card as the excuse (I don't have an active one right now), and the USB isn't working even after installing drivers and software from Samsungs site, and messing with the usb menu numbers. USB works in order to root the device, and it worked prior to rooting. HELP?!

Or you flashed the wrong version of CF auto-root or you need to remove Knox.
http://forum.xda-developers.com/galaxy-s4/general/scriptknoxout-complete-brutal-knox-t2807172

Thanks, finally got the phone rooted, what is the easiest way to unlock the phone from this point? It's at 4.4.4 model M919. I can only find guides for 4.4.2, but those do not work. Is the best option to flash to an older version? How is that done?
I'm following this guide, http://forum.xda-developers.com/showthread.php?t=2283068

ZacD said:
Thanks, finally got the phone rooted, what is the easiest way to unlock the phone from this point? It's at 4.4.4 model M919. I can only find guides for 4.4.2, but those do not work. Is the best option to flash to an older version? How is that done?
I'm following this guide, http://forum.xda-developers.com/showthread.php?t=2283068
Click to expand...
Click to collapse
You probably need to temporarily flash an old modem. Then apply that procedure and then flash back a correct modem.

[Q] Can't unlock rooted sgh-i337 on 4.4.4

I have a stock SGH-i337 running android 4.4.4 that is rooted.
I've rolled back to NC1 without success. I'm currently at NJ4.
I need to go from AT&T to T-Mobile.
I cannot access the hidden menus to remove the carrier lock.
None of the methods mentioned here seem to work - *#0011#, *#9090#, etc.
Any ideas?

Install safestrap, then flash the mf3 modem. Then try regionlockaway.
Sent from my Nexus 9 using XDA Free mobile app

Did that work? I'm going to be trying this for a phone my daughter bought a couple of days ago. It's an AT&T S4 that she wants to use on Tmobile.
The phone is on 4.4.4 and using I337ucuFNJ4. She used Ebay unlocking service and said they couldn't do it because of money owed on the previous owners account. She gave me the IMEI and it looks clean (as she did check this online and with AT&T before buying).
How can the phone essentially have a clean IMEI if money is still owed on the account? I'll get it from her on Friday and see what I can do.

Ok so I have the s4 rooted with towelroot and flashed the modem back to NJ4. Everything works fine.
Installed busybox then safestrap 3.72 and all of it installed fine. I have SuperSu and did a check root all is fine.
Now do I flash in safestrap the MF3 modem files and install regionlockaway then flash back to NJ4 with Odin? Man I have been searching around for hours to try and get this done. I hate asking for help, but if someone could give a little more detail it would be greatly appreciated. I don't want to brick this thing and was trying to get this down to give it to her in a couple of hours. Thanks guys.

I have a new paper weight.
I've fallen back to my original Galaxy S.
I hope the GS6 arrives soon.

Is unlocking this at&t phone even possible? And what did you do to brick your phone dude? I get the feeling I'm wasting my time with this, that it's not possible and people in the know are having a laugh. I hope that is not the case here.
There is just too much BS on the internet and feel like I'm searching for a needle in a haystack at this point.

Battery failure / short circuit / smoke / bad luck. I have to obtain a battery before I can tell if the damage is permanent.

Got it to work!
Ok I first off sorry for your trouble and hope the phone is not damaged buddy.
I used this technique here http://forum.xda-developers.com/gal...aranteed-free-sim-unlock-mk2-nb1-nc1-t2852979
Odin 3.10 was no longer working for me to flash baseband modem so did it all using safestrap. The files that safestrap uses are zip files and use them like they are (don't unzip them to use) and they are about 22 mb's in size.
The trick for me is it didn't work right away. I had to reflash with safestrap my NJ4 modem and reboot.... and put in the correct APN settings for T-Mobile.
So it does work and hope I can help others that fall into the same problem. If you need help just leave a message in this thread and I've subscribed to it so will get an email letting me know.
APN settings - https://support.t-mobile.com/docs/DOC-17581
This page came in helpful for grabbing need modem/baseband firmware - http://forum.xda-developers.com/showthread.php?t=2496517
Good luck! Do a backup in Safestrap if you're nervous. You can always start over.

The good news - only the battery was burnt.
What boot loader do I have? getprop ro.bootloader returns I337UCUFNJ4 and getprop ro.boot.baseband returns MDM. I presume that MDM is the bootloader version and I337UCUFNJ4 is the modem version.
I'm concerned that the guides and tips are for older versions of the GS4 that don't work on 4.4.4 and may actually do damage.

Ok glad to hear the good news man. The I337UCUFNJ4 is your modem right now.
A nice little free google play store program to use to get info on your phone is called Phone INFO, download it now please.
This will show you all kinds of information on your phone and what you need is to know is Device Type to know which Safestrap to install. Mine or my daughters was klteatt.
Keep in mind I don't have the phone in hand anymore, gave it back to her last night.
What you'll need to download from the modem page link is the I337UCUFNJ4 and the MF3 modems and keep them in their zip format to use. Create a folder on your external sd card ( mine was EXT SD Downloads ) and put both modem zip files in there.
Another program that needs to be installed is called BusyBox and I just used the free version https://play.google.com/store/apps/details?id=stericson.busybox&hl=en
You will need this busybox installed for safestrap to work properly. And also have developer Options activated and check install from unknown sources etc etc (you can do a quick search on this one) it's key to have this done and very quick to do.
Now if you follow the instructions here http://forum.xda-developers.com/gal...aranteed-free-sim-unlock-mk2-nb1-nc1-t2852979
the only thing I did different was flash back the modem MF3 firmware back to the NJ4 that you currently have. APN T-Mobile settings might have auto populated once the card was recognized (I had manually put it in earlier when it didn't work before flashing to NJ4) so not sure.
When safestrap is installed properly it will say so at the top of screen and nothing is greyed out. Do a backup so you can start over if you screw it up. Take like ten minutes or so, no worries.
I've had very little coffee this morning and sorry for being a bit all over the place with this. Let me know how it goes and if you need more help. Good Luck! At least you know it will work, I didn't.
I used Safestrap-JFLTE-3.72-kk-B01 (sorry for confusion forget the klteatt, sorry)------- phone INFO - https://play.google.com/store/apps/details?id=org.vndnguyen.phoneinfo&hl=en

I followed the instructions very carefully. The problem is that I no longer have cellular service on any network.
I've rebooted, tried to reflash each of the modems. NJ4 flash fails while the MF3 flash seems to work, but I still have no cellular service.
Phone info shows bootloader NJ4 and baseband MF3

hmmm makes it a bit harder not having the phone with me anymore. You did the developers options correctly?
Perhaps use Play Store and download 'SELinux Mode Changer' to see if it will allow you to install through Safestrap the NJ4 modem firmware?

nicetucu said:
hmmm makes it a bit harder not having the phone with me anymore. You did the developers options correctly?
Perhaps use Play Store and download 'SELinux Mode Changer' to see if it will allow you to install through Safestrap the NJ4 modem firmware?
Click to expand...
Click to collapse
Been there. Did that. No joy.
There is an NJ4.tar.md5 file. How do I use it?

ua549 said:
Been there. Did that. No joy.
There is an NJ4.tar.md5 file. How do I use it?
Click to expand...
Click to collapse
Flash it in Odin
Sent from my Nexus 5 using XDA Free mobile app

I used ODIN to flash the file. Baseband is still MF3. Still no joy. I'll try going back to NC1.

ua549 said:
I used ODIN to flash the file. Baseband is still MF3. Still no joy. I'll try going back to NC1.
Click to expand...
Click to collapse
Try the nb1 tar file. http://forum.xda-developers.com/showthread.php?p=50912149
Sent from my Nexus 5 using XDA Free mobile app

jd1639 said:
Try the nb1 tar file. http://forum.xda-developers.com/showthread.php?p=50912149
Sent from my Nexus 5 using XDA Free mobile app
Click to expand...
Click to collapse
Thanks! The phone is now working but I have to download, install and configure all (~150) of my apps again.
It will take a couple of days to pair all the Bluetooth devices (plus travel). I wish I'd known that this was a complete reset. I could have captured many of the apps, network locations and configurations. That said, I don't have to buy a new phone.

ua549 said:
Thanks! The phone is now working but I have to download, install and configure all (~150) of my apps again.
It will take a couple of days to pair all the Bluetooth devices (plus travel). I wish I'd known that this was a complete reset. I could have captured many of the apps, network locations and configurations. That said, I don't have to buy a new phone.
Click to expand...
Click to collapse
Sorry man, I thought if you've used Odin before you knew it would wipe your phone.
Sent from my Nexus 9 using XDA Free mobile app

yikes..... well good thing is the phone works. Glad it worked out, well kinda lol.

I'm happy I don't have to buy a new phone before the GS6 arrives. I'll just stick with AT&T until then.
I appreciate everyone's help!

[HELP] Straight Talk OF4 baseb, build root?

I was wondering if there was an accurate, safe root method for the OF4 baseband and build?
It's a Straight Talk Samsung Galaxy S4 SM-S975L straight from the local WalMart.
The strange thing is, the kernel version is dated Tuesday, June 16th.
It looks like this thing comes fresh without NB1 (which I'm not sure will work with this hardware configuration, so hesitant to Odin flash).
Bootloader says WRITE PROTECTION ON. It's obviously locked. But it's been made aware of a different firmware flash will trip knox. (Will Triangle Away fix?)
Towelroot v3 says "not supported" so: does not work with override code 1337 0 1 7380 4 0 (or something, I Googled it, eh...)
Towelroot v1 stops responding on "Make it ra1n" tap.
VRoot failure trick, then Towelroot at the bugged out rebooted OS with the error message makes Towelroot v1 reboot the phone, but alas, no root. This is one step further.
Kingroot does not work.
VRoot can get Towelroot to reboot the phone, but nothing happens.
Again, this seems to be a very recent baseband and build. Dated June 16th, 2015.
I can attempt an Odin flash if that is theoretically possible from Download mode but it will trip Knox and set the warranty bit.
Suggestions and safe STOCK ROM to flash?
If not an exploit, that's easier. Thanks. Looks like this new kernel's been patched.

LupineDream said:
I was wondering if there was an accurate, safe root method for the OF4 baseband and build?
It's a Straight Talk Samsung Galaxy S4 SM-S975L straight from the local WalMart.
The strange thing is, the kernel version is dated Tuesday, June 16th.
It looks like this thing comes fresh without NB1 (which I'm not sure will work with this hardware configuration, so hesitant to Odin flash).
Bootloader says WRITE PROTECTION ON. It's obviously locked. But it's been made aware of a different firmware flash will trip knox. (Will Triangle Away fix?)
Towelroot v3 says "not supported" so: does not work with override code 1337 0 1 7380 4 0 (or something, I Googled it, eh...)
Towelroot v1 stops responding on "Make it ra1n" tap.
VRoot failure trick, then Towelroot at the bugged out rebooted OS with the error message makes Towelroot v1 reboot the phone, but alas, no root. This is one step further.
Kingroot does not work.
VRoot can get Towelroot to reboot the phone, but nothing happens.
Again, this seems to be a very recent baseband and build. Dated June 16th, 2015.
I can attempt an Odin flash if that is theoretically possible from Download mode but it will trip Knox and set the warranty bit.
Suggestions and safe STOCK ROM to flash?
If not an exploit, that's easier. Thanks. Looks like this new kernel's been patched.
Click to expand...
Click to collapse
Maybe this thread can give you references.
http://forum.xda-developers.com/galaxy-s4/general/guide-sm-s975l-twrp-4-4-2-custom-roms-t3009757

Thank you! Looks like most of the T-Mobile ROMS work. But hesitant to install them. Good to know you can do this from the OF4 build! Flash to Odin Fenny ROM, flash Safestrap for T-Mobile variant, then flash any T-Mobile ROM that works. I need to make a backup of my modem, though after the Odin flash. Just in case.
I hope this helps others.
Too bad about the warranty bit, though.

Also would like to add you gotta flash the kernel over the ROMs. Koontsz kernel. Otherwise you get a brick

LupineDream said:
Thank you! Looks like most of the T-Mobile ROMS work. But hesitant to install them. Good to know you can do this from the OF4 build! Flash to Odin Fenny ROM, flash Safestrap for T-Mobile variant, then flash any T-Mobile ROM that works. I need to make a backup of my modem, though after the Odin flash. Just in case.
I hope this helps others.
Too bad about the warranty bit, though.
Click to expand...
Click to collapse
You don't need safestrap. That's not for your phone. It's only for the T-mobile phone. Also just flash the TWRP and then the rom you want. You don't need to first flash that Fenny rom.