Unlocked AT&T Galaxy S4 not working properly

Search This thread
By:
Advanced…
amith007

amith007

Senior Member
Nov 9, 2010
314
51
New York
My fried bought a Galaxy S4 from AT&T when he was in US. While leaving the country he bought an unlock code from AT&T and unlocked the phone using the same in India. His phone was working fine initially. Then sudden signal loss started to occur and need to restart the phone to get the signal back. Tried using different Indian carriers and the same issue continued. Will I be able to solve this issue by flashing a custom rom into his phone? Do I need to take care of anything else, like the modem firmware or something. Attaching a screen shot of his phone details. Please help guys..

Sent from my Nexus 4 using XDA Premium 4 mobile app
 

Attachments

  • 1399193104795.jpg
    1399193104795.jpg
    98.6 KB · Views: 96
DeadlySin9

DeadlySin9

Senior Member
Sep 2, 2012
1,475
703
Google Pixel 8 Pro
amith007 said:
My fried bought a Galaxy S4 from AT&T when he was in US. While leaving the country he bought an unlock code from AT&T and unlocked the phone using the same in India. His phone was working fine initially. Then sudden signal loss started to occur and need to restart the phone to get the signal back. Tried using different Indian carriers and the same issue continued. Will I be able to solve this issue by flashing a custom rom into his phone? Do I need to take care of anything else, like the modem firmware or something. Attaching a screen shot of his phone details. Please help guys..

Sent from my Nexus 4 using XDA Premium 4 mobile app
Click to expand...
Click to collapse

You could try reflashing the same MDL firmware first. If that doesn't work, then install TWRP and try the different flashable modems.

Sent from my SGH-I337 running BlackBox 3.0
 
  • Like
Reactions: amith007
amith007

amith007

Senior Member
Nov 9, 2010
314
51
New York
Thank you for the reply.. However we have already tried a factory reset.. Will it be a problem if I flash the modem firmware available in the Indian Galaxy S4?? The Indian version comes with an exynos octa processor instead of the Qualcomm one..

Sent from my Nexus 4 using XDA Premium 4 mobile app
 
DeadlySin9

DeadlySin9

Senior Member
Sep 2, 2012
1,475
703
Google Pixel 8 Pro
amith007 said:
Thank you for the reply.. However we have already tried a factory reset.. Will it be a problem if I flash the modem firmware available in the Indian Galaxy S4?? The Indian version comes with an exynos octa processor instead of the Qualcomm one..

Sent from my Nexus 4 using XDA Premium 4 mobile app
Click to expand...
Click to collapse

Doing a factory reset is different from reflashing the firmware. I don't think the other modems would work, but I'm not entirely sure. If they're recovery zips you could try, but if they're ODIN files it definitely won't work.

Sent from my SGH-I337 running BlackBox 3.0
 
amith007

amith007

Senior Member
Nov 9, 2010
314
51
New York
I have tried reflashing the phone with Odin. The device now has the latest Android 4.4.2 firmware from AT&T. It seemed to work fine after flashing. We got the network and were able to make calls as well. However after sometime the signal got cutoff itself. Tried flashing again, the same thing happens. Any other suggestions??

Sent from my Nexus 4 using XDA Premium 4 mobile app
 
You must log in or register to reply here.

Similar threads

graydiggy
Official AT&T S4 Safestrap Discussion Q/A
Replies
2K
Views
329K
F
fragmentalstew
N
galaxy s4 sgh I337 at&t unlock
Replies
47
Views
117K
audit13
audit13
Super Evan
Solution. ATT Galaxy S4 I-337 MF3 Recovery Solution.
Replies
259
Views
103K
E
easonyu
shivup
Fonts for AT&T Galaxy S4 ?
Replies
63
Views
60K
rachelm920
rachelm920
P
[Q] Bootloader unlock Galaxy s4 sgh-i337 4.4.2 kitkat
Replies
31
Views
83K
S
StoneyJSG

Top Liked Posts

24 Hours All time
  • There are no posts matching your filters.
  • 1
    DeadlySin9
    DeadlySin9
    amith007 said:
    My fried bought a Galaxy S4 from AT&T when he was in US. While leaving the country he bought an unlock code from AT&T and unlocked the phone using the same in India. His phone was working fine initially. Then sudden signal loss started to occur and need to restart the phone to get the signal back. Tried using different Indian carriers and the same issue continued. Will I be able to solve this issue by flashing a custom rom into his phone? Do I need to take care of anything else, like the modem firmware or something. Attaching a screen shot of his phone details. Please help guys..

    Sent from my Nexus 4 using XDA Premium 4 mobile app
    Click to expand...
    Click to collapse

    You could try reflashing the same MDL firmware first. If that doesn't work, then install TWRP and try the different flashable modems.

    Sent from my SGH-I337 running BlackBox 3.0
    View

New posts