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Can't Unlock my S4 MDL AT&T i337 in 4.4.2 please

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TheMechanics
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Default Can't Unlock my S4 MDL AT&T i337 in 4.4.2 please

Hi everybody here, well, i purchase my S4 AT&T model i337, "the baseband finish in MDL" from a seller in ebay, the phone is locked, and comes with cyanogenmod 4.4.2 kitkat, i cannot access at the SERVICE MODE,

I have tried this method

*#27663368378#
*#0011#
*#197328640#* but nothing happens,

And the RegionLockAway does not work, it says "could not locate CSC data"

I dont know what to do, my phone is rooted... i read a lot of threads of information but nothing works for me...

i'm from Argentina, thanks everybody...

Please if someone knows how to unlock please comment in this thread!
 
Oncet
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Quote:
Originally Posted by TheMechanics View Post
Hi everybody here, well, i purchase my S4 AT&T model i337, "the baseband finish in MDL" from a seller in ebay, the phone is locked, and comes with cyanogenmod 4.4.2 kitkat, i cannot access at the SERVICE MODE,

I have tried this method

*#27663368378#
*#0011#
*#197328640#* but nothing happens,

And the RegionLockAway does not work, it says "could not locate CSC data"

I dont know what to do, my phone is rooted... i read a lot of threads of information but nothing works for me...

i'm from Argentina, thanks everybody...

Please if someone knows how to unlock please comment in this thread!
I read in a forum here in XDA that you need to be on stock firmware in order to unlock your phone.
 
TheMechanics
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Originally Posted by Oncet View Post
I read in a forum here in XDA that you need to be on stock firmware in order to unlock your phone.
ok but how? because i read here that, i cannot downgrade from 4.4.2 to 4.2.2!!
 
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Keep your custom and buy an unlock code.

Sent from my SAMSUNG-SGH-I337 using xda app-developers app
 
DeadlySin9
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Quote:
Originally Posted by TheMechanics View Post
ok but how? because i read here that, i cannot downgrade from 4.4.2 to 4.2.2!!
That's if you're on the stock 4.4.2. You can Odin the MDL files and root and make sure to freeze the updater apps while you unlock, and then flash back to CM.

Sent from my SGH-I337 running Blackbox 3.0
Current Device: ATT Samsung Galaxy S4 (i337)

Past Devices:
Droid Bionic (GSM Hacked)
HTC Inspire 4G (Desire HD)
Nexus One
Motorola Backflip
HTC Dev Phone 1 (Dream/G1)
 
TheMechanics
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Originally Posted by DeadlySin9 View Post
That's if you're on the stock 4.4.2. You can Odin the MDL files and root and make sure to freeze the updater apps while you unlock, and then flash back to CM.

Sent from my SGH-I337 running Blackbox 3.0
thanks for answer, them i can flash the stock rom 4.2.2 from sammobile with odin? or i need to flash only the MDL files?
 
TheMechanics
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Quote:
Originally Posted by DeadlySin9 View Post
That's if you're on the stock 4.4.2. You can Odin the MDL files and root and make sure to freeze the updater apps while you unlock, and then flash back to CM.

Sent from my SGH-I337 running Blackbox 3.0
Thanks a lot, the phone has a BACKUP of the Stock FW 4.2.2, well, i restore that BACKUP and my phone comes to the factory version, so i tried this method to unlock:

Quote:
Originally Posted by Originally Posted by kaleido View Post
Hi Everyone,

I'm a long time lurker and benefited greatly from the postings here at xda.
So I'd like to contribute something back.

After trying many methods and reading all the posts in the various S4 forums, I finally found a way for SIM unlock that works for me.

I have tested it, and it works on my T-Mobile S4.

Credit to these posts:
KaneHusky's post for the dialer code
This thread on how to unlock
chavxxx's post pointing to the right final step

Here are the steps:
Goto phone dailer, and enter *#27663368378# for the debug service menu.
In "ServiceMode", select [1
UMTS
In "UMTS MAIN MENU", select [1] DEBUG SCREEN
In "DEBUG SCREEN", select [6] PHONE CONTROL
In "PHONE CONTROL", select [6] NETWORK LOCK
In "NETWORK LOCK", select [3] PERSO SHA256 OFF
It should show:
SHA256_ENABLED_FLAG[1]
SHA256_OFF => SHA256_ON
Now touch the first line SHA256_ENABLED_FLAG[1]
It should show:
MENU NOT EXIST
PRESS BACK KEY
Current Command is 116631
Now press the menu button and select "Back"
It should show:
SHA256_ENABLED_FLAG[0]
SHA256_OFF => Not Change
Again, press the menu button and select "Back", and you're back in the "NETWORK LOCK" screen
Press the menu button and select "Back", and you're in the "PHONE CONTROL" screen
Press the menu button and select "Back", and you're in the "DEBUG SCREEN" screen
Finally, press the menu button and select "Back", and you're back in the "UMTS MAIN MENU" screen
Select [6] COMMON
In "COMMON" screen, select [6] NV REBUILD
Now you are in the "NV REBUILD" screen, you should see the following text:
------------------------------
Golden-Backup exist
You can Restore Cal/NV
------------------------------
Now for the final step.
In "NV REBUILD" screen, select [4] Restore Back-up
The button lights for menu and back should come on, and the phone will auto reboot in a few seconds.
Note: chavxxx's post of selecting "[1] Load default NV" DID NOT work for me.

Congratulations, your phone is now unlocked.
Stick in a sim card from a different carrier and try it out.

Please post followups of your experience with this unlock method.

Thanks, and good luck!

AND MY PHONE IS UNLOCKED THANKS EVERYBODY!!!! I ONLY NEED TO RESTORE MY PHONE TO FACTORY FIRMWARE AND UNLOCK!!
 
toxicpaulution
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Jesus. you don't want to flash the 4.4.2 Odin package if you're on mdl. Then you can't custom rom your phone. stay on a touchwiz rom and use the region lockaway App and it will unlock your phone. Worked for my mdl phone.

Sent from my SAMSUNG-SGH-I337 using Tapatalk
 
nadirghazi
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Default hi

Quote:
Originally Posted by TheMechanics View Post
Thanks a lot, the phone has a BACKUP of the Stock FW 4.2.2, well, i restore that BACKUP and my phone comes to the factory version, so i tried this method to unlock:




AND MY PHONE IS UNLOCKED THANKS EVERYBODY!!!! I ONLY NEED TO RESTORE MY PHONE TO FACTORY FIRMWARE AND UNLOCK!!
hey my phone cant go to umts mode this code wont for to my i337 on 4.4.2 any solution?
 
TheMechanics
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Quote:
Originally Posted by nadirghazi View Post
hey my phone cant go to umts mode this code wont for to my i337 on 4.4.2 any solution?
You are in stock rom? i need more details of your phone!

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