yashsingh1/xdaforums huggingface dataset:
[Sprint Samsung Galaxy S 4 Android Development] desiwizard:
Yes it can lock the phone. But people have managed to unlock with same procedure as for mk2.
[Sprint Samsung Galaxy S 4 Android Development] TheGoodFellas:
Ok thanks, can someone confirm this and their experiences after updating to 4.4
[Sprint Samsung Galaxy S 4 Android Development] keyro:
no you wont, im on official 4.4.2 and im still unlock

---------- Post added at 06:28 PM ---------- Previous post was at 06:26 PM ----------

mine remained unlock when i updated and i took the ota so i can only comment on my experience
[Sprint Samsung Galaxy S 4 Android Development] TheGoodFellas:
Did you have to redo the unlock after upgrading to 4.4.2? Desiwizard said upgrading to 4.4 /NAE will relock device
[Sprint Samsung Galaxy S 4 Android Development] keyro:
no, i didnt have to unlock it, it remained unlocked but as i said that was my experience on my end
[Sprint Samsung Galaxy S 4 Android Development] dabar7:
AIO (AT&T)

Hey, I have AIO and only get E (edge) after unlocking, which is terrible (flashed MDC modem, #'d out my two entries in build prop, set both network settings to "gsm only"). I'm on NAE still with MDC modem. What can I do because there is plenty 3g/4g in my area, even 2g. Also I have used AIO and AT&T's common APNs that I see via Google.

I think I switched to AT&T's APN earlier today using APN settings short cut from the play store, while having HiAPN installed and lost signal for quite a while. I deleted HiAPN because a lot if it was in Chinese and it crashes, sometimes right after I reboot. Any ideas to get more than edge?
[Sprint Samsung Galaxy S 4 Android Development] thaifani:
until 4.4.2 it,s work

yes it's work until 4.4.2

I have sprint SPH-L720 4.4.2

and i downgrade the modem by this MDC modem

http://www.rwilco12.com/Files/Devices/Samsung%20Galaxy%20S4%20%28SPH-L720%29/Modems/SPH-L720_MDC_Modem.exe

and run the s4 flasher and will reboot with completed message

and update the modem to NFA
[Sprint Samsung Galaxy S 4 Android Development] dabar7:
how and why did you upgrade the modem to NFA ?
[Sprint Samsung Galaxy S 4 Android Development] MX51:
Need for root?

Well I've been looking everywhere on this thread to see if I need to be rooted to try this method of unlocking but have not been able to find it. Can anyone confirm if there is a need to root before reverting back to MDC? I am on MK2 now, I would like to go back to MDC, unlock then update back to MK2 and OTA to 4.4.2 (hopefully it will not remove unlock after OTA like someone mentioned in a previous post). I have had the screen saying the update is ready to install but I have not wanted to update until I unlock the phone. Thanks for the help!
[Sprint Samsung Galaxy S 4 Android Development] dino_mk:
No need to be rooted.

Sent from my SPH-L720
[Sprint Samsung Galaxy S 4 Android Development] elmy2424:
will this work on sph-l720t modelr???
[Sprint Samsung Galaxy S 4 Android Development] shokuhawan:
WORKED ON NAE 4.4.2. Confirmed
[Sprint Samsung Galaxy S 4 Android Development] rodmc123:
hey i have the same issue in Chile.. the LTE esm 29 mmx error.. but i dont know if there problem is related to the username and password.. because ive used apn that works with username and password.. in fact i get that error on LTE areas only.. is like the phone tries to go on LTE instead of switching to 3g, even if you have selected gsm or WCDMA only...

it would be nice if someone can look into this issue!
[Sprint Samsung Galaxy S 4 Android Development] dino_mk:
I was getting that "LTE esm 29 mmx error" first time when I was unlocking my phone. Downgraded the modem, unlocked the phone, upgraded the modem and then I was getting that error. Fixed the problem with just reflashing the modem again (at that moment was on MF9 modem and just reflashed same MF9 modem).

Hope this will help you.

Sent from my SPH-L720
[Sprint Samsung Galaxy S 4 Android Development] rodmc123:
i've reflashed the modem a lot of times and i get the same error..
[Sprint Samsung Galaxy S 4 Android Development] Kioba:
Losing Unlock

I have this L720, I've unlocked following the instructions, but after a couple days (a week or less) the phone says Invalid Sim Card and the unlock is gone. At first I though that it was because updates, but now I have updated to 4.4 and still keeps it keeps losing the update.

Anyone knows what may happen or how I can solve this? :confused:

Thanks,
[Sprint Samsung Galaxy S 4 Android Development] rodmc123:
is there any way to install a tmobile, at&t or verizon radio in this phone? i downloaded a tmobile modem but i couldnt flash it using odin.. i got an error, is there any way to do it??
[Sprint Samsung Galaxy S 4 Android Development] lordfariq:
some question

anyone know why i cant do system update after make unlock?

i want to update to kitkat 4.4.2 but its error when trying to update?

also i want to confirm with y'all if i update to 4.4 the unlock still can be use?

thanks.
[Sprint Samsung Galaxy S 4 Android Development] 2strokenut:
The MDC modem flash will not work on NAF, it will on NAE. It just fails. Looks like you can't go backwards with the modem anymore.

Edit: this one is a L720t
[Sprint Samsung Galaxy S 4 Android Development] Kioba:
Help!

Someone could help with this? I'll appreciate your comments.

Thanks,
[Sprint Samsung Galaxy S 4 Android Development] daniel4653:
From what I understand after you upgrade the software you have to unlock the phone again.
[Sprint Samsung Galaxy S 4 Android Development] jkjambo:
Works on 4.4.2 (NAE)

installed that mdc modem , but i got error in odin . anyway i rebooted phone and it was on mdc modem (hah :D)

then i unlocked it and installed NAE modem (really don't know why i need it , but anyway)

but now i want to know , after this i need something to get better signal? it's on 1-3 bars only (more times on 1)
[Sprint Samsung Galaxy S 4 Android Development] edj809:
Sure that works well on 4.4.2?, Want to buy one and have 4.4.2 but not sure if I can unlock it
[Sprint Samsung Galaxy S 4 Android Development] jkjambo:
Yes it works but you must try few times. I have 4.4.2 and it works on gsm. But you must know that odin always fails, always! You must keep trying
[Sprint Samsung Galaxy S 4 Android Development] CMeys:
Okay, I've skimmed this thread and am totally confused. I am a moderately knowledgable android user, but not a super knowledgable one. I have a Sprint Galaxy S4 that I want to use in Israel with a SIM card from Israel's Orange network.

I thought it is only necessary to have Sprint activate it to be used that way. Is it really always necessary to go through this whole complex (to me at least) routine? I don't know if I can handle this. If I have Sprint activate it for International use, and then put in the Orange network SIM card, it won't work? Are there no options other than what is in this thread?

If not, at least please help me get started. Where do I find what modem build I have?
[Sprint Samsung Galaxy S 4 Android Development] edj809:
to know the baseband go to settings, about the phone and there it shows the baseband version

---------- Post added at 03:32 PM ---------- Previous post was at 03:29 PM ----------

Has anyone tried to unlock it with bad esn?
[Sprint Samsung Galaxy S 4 Android Development] CMeys:
Okay, under baseband version it says:

L720VPUFNAE

That doesn't look any of the things mentioned in the beginning of this thread.
[Sprint Samsung Galaxy S 4 Android Development] edj809:
These in 4.4.2 can flash the modem. Just follow the steps.
[Sprint Samsung Galaxy S 4 Android Development] dino_mk:
That last 3 letters are your version NAE. In the beginning of the thread there were versions like MDA, MDC, MF9 etc.

Last couple of pages are about your version, so follow the tutorial from first page but read lsst pages for some tips if there is some problem.

p.s. If Sprint unlocks ur phone for use on GSM networks, then you don't have to do any of these.

Sent from my SPH-L720
[Sprint Samsung Galaxy S 4 Android Development] CMeys:
It seems much easier to have Sprint unlock it; why would I choose not to go that route? And once Sprint unlocks how can I be sure it worked while still in the US (I will have possession of the foreign SIM card). Thanks.
[Sprint Samsung Galaxy S 4 Android Development] daniel4653:
Not everyone with a SPH-L720 has sprint.
[Sprint Samsung Galaxy S 4 Android Development] dino_mk:
Everything is already answered from the beginning of this thread. Please read it!

Sent from my SPH-L720
[Sprint Samsung Galaxy S 4 Android Development] CMeys:
Isn't this a Sprint forum that I posted in -- it says "Spring Samsung Galaxy S4..."?

---------- Post added at 04:42 PM ---------- Previous post was at 04:40 PM ----------

I did read the 1st few & skimmed the last few pages and saw the review of the procedure but didn't (certainly could have missed it as there is so much info there) see the reason it was necessary over having it done by Sprint. Sorry if I missed it, but it can be difficult to find a specific thing in 18 pages of info, so it is some times necessary to ask for help. If you can't or don't want to help, that's fine, but even a pointer to the right message with the info is very helpful.
[Sprint Samsung Galaxy S 4 Android Development] daniel4653:
Yes. Look at what I am saying not everyone who buys a sprint GS4 will use it on Sprint service. Some people buy it to use overseas or domestically with ATT or Tmobile. So since they don't have sprint service but wish to unlock the phone they can do so using this thread.
[Sprint Samsung Galaxy S 4 Android Development] CMeys:
Okay, I understand now. This procedure then shouldn't be necessary for someone with the Sprint phone presently on Sprint services who just wants to use it temporarily overseas with a foreign Sim card, correct? I appreciate your help and clarification.
[Sprint Samsung Galaxy S 4 Android Development] redline57:
Got a chance to do it a while back now a chance to prove it work.

Sprint on Sacs 4.4.3

Set my Claro Apn for Nicaragua and is all done Data and phoneView attachment 2681128
[Sprint Samsung Galaxy S 4 Android Development] desiwizard:
Unlock Stuck while upgrading from MJA to NAE

Just want to share my experience that I managed to upgrade to NAE from MJA and my sim unlock remain intact.

Steps I followed:

Downloaded complete NAE firmware from samfirmware.com

Changed Phone Mode from GSM to LTE / CDMA

I had a sprint sim which I inserted (Optional)

Used ODIN 3.09 to flash NAE

Changed the mode back to GSM / UMTS

Rebooted Phone

Inserted GSM sim and Got the signals without the need for re-unlocking phone, voice / data both working APN adding option enabled

Finally Rooted

(I bought this phone on MK2 FW with GSM portion locked, I downgraded to MJA and unlocked with the procedure given in this forum)

I hope this may be helpful to some

Regards
[Sprint Samsung Galaxy S 4 Android Development] elmy2424:
will this work on sph-l720t?
[Sprint Samsung Galaxy S 4 Android Development] bond17_007:
wifi off

I was on NAE baseband.

I did the following:

1. I went and got MDC version from here:

http://xdaforums.com/showpost.php?p=42954149&postcount=2

2. I updated the baseband modem only using Odin3 v1.85

3. I noticed some weird behavior like power button etc not functioning properly.

4. I ran the Unlocker and verified that it accepted international sim.

5. I used odin3 to re-flash to NAE version. Which I also got from:

http://xdaforums.com/showpost.php?p=42954149&postcount=2

6. unlock remained.

7. My wifi is not working, I had pin unlock before which got changed to swipe and I am not able to set pin also, as it just ignores it.

So in a nutshell I went from NAE > MDC > Wifi not working > Unlocked SIM > NAE (Still no wifi)

Note. I have the rooted Stock ROM

Can someone please help.
[Sprint Samsung Galaxy S 4 Android Development] inaudible101:
I'm having the same problem. Flashed five different radios and did several factory resets and no go. I think you if you do a complete odin flash you'll be ok but relocked. This kind of sucks.
[Sprint Samsung Galaxy S 4 Android Development] lord dredd:
See if you have different bootloader than the radio and rom then wifi will break.

If you are on pure NAE rom, radio and bootloader then I don't see any reason why wifi should break.

This has been a common issue since 4.3 what people have been doing is using custom kernel to fix wifi, at least that's what I did when my wifi broke with old bootloader but 4.3 rom. And radio.
[Sprint Samsung Galaxy S 4 Android Development] bond17_007:
Yeah that seems to make sense. I had flashed TWRP recovery to root my device. Now I see different bootloader.

It is hard to get to recovery mode. I have to try Vol up + power + home button multiple times before I can get into recovery or the custom flash mode.

Anyway, do you have any links to custom kernel to fix this? I am on 4.4.2 NAE latest from sprint? I used the above links to get the modem bin installed.
[Sprint Samsung Galaxy S 4 Android Development] inaudible101:
I have been on pure NAE. I've attempted it multiple times then figured screw it I'll just install a different ROM. Now I've found that it screwed my recovery. I can ODIN back to completely stock NAE and everything works, but I lose the unlock. I then installed a custom recovery and verified it works. I then install the old modem and run the unlock and it appears that it's the running of the unlock that fubars my recovery because now when I try to boot to recovery I get the "system software not authorized..." error. I can still boot into the OS and download mode and even flash back to the NAE modem and keep unlock, but my recovery and my wifi are now borked. The only option is to restore back to complete stock NAE in odin. I've done this few times now to make sure I didn't miss anything. I find comfort in knowing that I can still odin back atleast.

[EDIT]

I want to clarify that I tried with and without the custom recovery. I'm going to just install a custom rom and see if I can unlock it after doing that without loosing wifi.
[Sprint Samsung Galaxy S 4 Android Development] lord dredd:
See if you wish to use your phone on GSM or if at all you wish to root and all , then first up DEKNOX your phone

as soon as you have rooted your phone , the first thing before trying anything out would be to install ROOT EXPLORER and then search for KNOX in it .

it will take sometime but after a few minutes ROOT EXPLORER will show a number of files , you are supposed to indiscriminately delete them ( i can say its safe coz i have done that myself and havn't faced any issues whatsoever till date )

BUT REMEMBER : as soon as you are rooted , install custom recovery and make a nandroid or backup or whatever it is called , once you have a backup , then boot the phone and search for knox in root explorer or any other file explorer which hasd root access.

after that try things , everything will be great no hindrance

NOTE : Deknoxing voids the warranty , if you are a into warranty and stuff this aint for ya :)
[Sprint Samsung Galaxy S 4 Android Development] inaudible101:
Ok great. I saw a guide that listed the files to delete, but I was under the impression that they should mess with the recovery and since I was installing a custom rom after unlock I wasn't to worried about it anyways. After five hours I've sunk into this I'm pretty familiar with the whole process. So I'll Odin back to stock, install the custom recovery, get root, backup, and then try deleting knox before continueing with the modem stuff. Thanks for the heads up. I have a ATT s4 also and I haven't messed with knox at all since the bootloader is locked anyways and I haven't had any interference with safe strap. I may have to clear it off of that too if all goes well.
[Sprint Samsung Galaxy S 4 Android Development] bond17_007:
I am still under warranty and need to make a claim. So, I would rather not mess around much. Do you guys have a link to stock NAE that I can revert to? I have a slow data connection so if there is a way to fix by applying firmware only instead of full 1.5GB OS would be ideal.

At this point I just want to go back and undo all these steps so wifi works and works on Sprint. (I was just trying to use it while I am out of US now. I do not want to waste my time working on it anymore :( Giving up)

In a nutshell, giving up on Sprint just because of all these limitations.

Thanks guys

---------- Post added at 05:12 PM ---------- Previous post was at 04:35 PM ----------

I downgraded to MDC and went back to NAE but my wifi is not working. Looks like my baseband/firmware and bootloader is not matching. is there an update NAE file?

---------- Post added at 05:18 PM ---------- Previous post was at 05:12 PM ----------

Is your wifi still working? I am on 4.4.2 and after the unlock I lost wifi and device is acting up. How did you go back to NAE modem? thanks,
[Sprint Samsung Galaxy S 4 Android Development] inaudible101:
Even flashing back to just the NAE modem does not fix the wifi issue for me. The only thing that worked was flashing the whole thing. I had to download the 1.5GB TAR file and flash it.
[Sprint Samsung Galaxy S 4 Android Development] bond17_007:
Thank inaudiable101, can you please share a link to the tar file? I am not in the US, I am guessing doing that will mess up my activation and data settings.

Googling for it did not resolve to file.

With the slow data speed, I would rather not take a chance downloading it for a few days to find out it wasnt the right file :). I really appreciate your help.

Thanks,
[Sprint Samsung Galaxy S 4 Android Development] inaudible101:
It should be here http://www.sammobile.com/firmwares/3/?download=25944 once the site maintenance is done.

---------- Post added at 05:08 AM ---------- Previous post was at 04:54 AM ----------

So I deknoxed and after flashing the old modem I am unable to boot back into recovery. Starting to think there is no way for me to unlock this and keep my recovery functions at this point.
[Sprint Samsung Galaxy S 4 Android Development] inaudible101:
So after some more testing last night it appears it the unlock program or the reflashing of the NAE that trips the recovery lockout. I am going to be out of town for the weekend but I'm going to try and do some more testing in a few days to nail down exactly what is tripping it. I'll update you guys when I figure out the specifics.
[Sprint Samsung Galaxy S 4 Android Development] bond17_007:
Just out of curiosity I have attached info about my phone. Everything looks good to me. All version seems to match but my wifi still does not work.

Recovery screen reads:

Android system recovery <3e>

KOT49H.L720VPUFNAE

Thanks for the link I will download that firmware to update my phone.

Thanks,
[Sprint Samsung Galaxy S 4 Android Development] bond17_007:
Is anyone else having similar issue?
[Sprint Samsung Galaxy S 4 Android Development] bond17_007:
Finally I was able to enable wifi by flashing to MK9 modem then re-flashing to NAE. This worked but now the only thing that is stuck is the Lock screen..

All the lock screen options says "Turned off by administrator, encryption policy or credential storage". Only PIN and Password is on but even If I set it, it just goes back to default swipe. Any suggestions would be appreciated.

Thanks,
[Sprint Samsung Galaxy S 4 Android Development] piercednevins:
You might need to edit build.prop to comment out a line

Open it up in Root Explorer or ES File Explorer and change the following line from:

security.mdpp=none

to:

#security.mdpp=none

And then reboot.

I'm curious though, did you maintain your sim unlock?
[Sprint Samsung Galaxy S 4 Android Development] bond17_007:
Thanks [MENTION=665852]piercednevins[/MENTION],

Yes I did maintain my SIM unlock. I had flashed to MDC to unlock. I then applied MK9 and later NAE.

With build.prop "comment" fix, now security stuff is working :).

Just curious why would we need to comment that line, was it introduced as part of radio updates? or is it due to something else?

Wifi and Security unlock stuff were the only thing I was saw was off after downgrading the radio. I am little concerned if it there is lot more that got messed up.
[Sprint Samsung Galaxy S 4 Android Development] piercednevins:
[MENTION=2245708]bond17_007[/MENTION] Truthfully, I don't know...I just remembered having to do that when I first flashed Sac's ROM, so I actually knew the fix for once! :)
[Sprint Samsung Galaxy S 4 Android Development] rockytruelyrox:
A big thanks to Autoprime and all other awesome ladies and gentlemen here. I could unlock my GS4 to use it India in 10 minutes, I spent a few hours reading all posts in this thread though but that's the fun of it. I am pretty sure I did ample of research. My only problem is after giving the APN settings also I don't get 3G only Edge. What have I done wrong or any idea what can fix it?

1st off I don't care about Knox and sammy warranty so lets not even consider them in my case. Here is what I did:

1. flashed cf root (ty chainfire forever).

2. Installed goo.im and flashing TWRP (awesomeness again).

3. Flashed the MF9 modem through exe base odin flashable found here in forums.

4, Ran the gs4unlock file given by autoprime with phone in download mode.

5. Airtel India was detected. Flashed the NAE modem base found here in forum, it was 60 mb.

I have had no other issues in last 24 hrs with anything else. WiFi works like a charm for those who are bothered by it.

update: it started working by itself. Getting HSDPA+ now.
[Sprint Samsung Galaxy S 4 Android Development] darkskywalker:
So will it work to flash a sgh 919 modem to unlock phone
[Sprint Samsung Galaxy S 4 Android Development] VicttorMejia:
Will this work with Offical kitkat 4.4.2 Model SPH-720T?
[Sprint Samsung Galaxy S 4 Android Development] cristian.j:
please post the links of the MF9 .exe and the NAE of 60mb because i can't find it

,and i can't turn on my wifi after try to unlock with this method ,or any one that can help me to fix the wifi issue ,i did the NAE to MDC ,unlock and then back to NAE but still no wifi
[Sprint Samsung Galaxy S 4 Android Development] bond17_007:
See my posts in the last page. That may help you. You would want flash to version previous to NAE then to NAE. Note while on those Modem your phone will not work correctly even touch events and buttons may fail to work.
[Sprint Samsung Galaxy S 4 Android Development] cristian.j:
Thanks for the reply

ok but where i can find the mk9,i didn't know of that version ? , i tried with the mf9 and the same wifi issues .

I did the tests with the same rom that have the wifi issue, maybe i need to reinstall the stock NAE Firmware and do all again ?
[Sprint Samsung Galaxy S 4 Android Development] daniel4653:
There is no such thing as mk9 I think you are mixing up MF9 and MK2. Both are found in unknownforces thread in development section .
[Sprint Samsung Galaxy S 4 Android Development] vMAC:
Anyone else having issues doing MMI codes on the GSM once unlocked? I now can't do codes like *111 or *159 which my provider requires.
[Sprint Samsung Galaxy S 4 Android Development] bond17_007:
You can find the stock firmware here: http://www.sammobile.com/firmwares/3/?download=25944

Make sure your phone is with Sprint. Flashing with this should solve your problem but sim unlock will be lost. You can retry steps listed on this thread to unlock. Do post your success or failure so others will benefit.

About the other Firmware you can get them here: http://xdaforums.com/showpost.php?p=42954149&postcount=2

Try Modem only with No Bootloader. I had flashed mine with MK2 then with NAE to get wifi back.

Hope this helps.
[Sprint Samsung Galaxy S 4 Android Development] Brainfeederz:
nevermind got it to work :)
[Sprint Samsung Galaxy S 4 Android Development] TechShui:
So I flashed the MDC modem successfully on a L720 with NAE.

But I still get invalid SIM, can someone who has successfully done this on NAE help me out?

Does this require root, or what am I missing?
[Sprint Samsung Galaxy S 4 Android Development] TechShui:
No suggestions?

Do I need to downgrade the whole phone to MJA and then reflash MDC modem? What steps am I overlooking, or is just not working for some people?