Help - Galaxy S 4 Q&A, Help & Troubleshooting

I have a samsung galaxy s4 i9500.
It is the 16gb version.
For some reason, whenever i install a custom rom, my mobile network and data doesnt work. It simply cant detect my sim. All works fine in the stock rom. I tried modems but none of them work. I heard xda has good helpers so please guys help me out ! ???
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[Q] 3g not working

Running omega rom v5 on i9505 and i cant connect to 3g, only edge, tried different modem but that didn't work. Don't know what to do.
midevilguy said:
Running omega rom v5 on i9505 and i cant connect to 3g, only edge, tried different modem but that didn't work. Don't know what to do.
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There has to be something with APN setting call ur operator they ll help u
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Galaxy S4 confused about roms

Hi all,
I have a galaxy S4 which is rooted problem is I do not understand what roms I can use as I am in Australia and I see alot of European roms etc...
Is there a sticky or a page that I can refer to about this and possibly other questions I may have?
Thanks in advance
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Check every Rom thread there yu can see commts about the Rom . Aftr tat select 1 of it . All the roms are gud try 1 by 1 .if installed rom has prob den try othr . try these http://forum.xda-developers.com/showthread.php?t=2253528
http://forum.xda-developers.com/showthread.php?t=2372286
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What about base bands etc? If I use one from the wrong zone can't I Brock my phone?
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Nope. You have an i9505, as long as what ever your flashing is for the i9505 you're fine.
Country doesn't mean anything.
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Okay cool thanks obagleyfreer one more thing does it matter about the at&t roms?
I am looking at installing this but it says only for certain countries
http://forum.xda-developers.com/showthread.php?t=2537495
Just want to make sure I can still use LTE hehe
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aza2001 said:
does it matter about the at&t roms?
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It's not advisable to flash branded ROM's on unbranded device but you may.
If you do, please report the results.

Unlocked AT&T Galaxy S4 not working properly

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..
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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
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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
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..
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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..
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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
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??
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[Q] Issues with flashing official firmware XXUBNG4

I have flash my galaxy grand 2 with GenNxt custom rom, in that rom wifi is not working.
So I have tried to get back to official firmware 4.4.2 which I have updated before using custom rom.
But now after going to download mode it shows UDC START and it fails to flash, guys plz help me out....
In advance thanks.....
I am also having same issue. Someone suggested me to downlosd INS version of rom. But i have not tried it as this rom is great.
Please let me know whether it works or not
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What did use ?
This is why u shudnt root or use Custom Roms !
U can Get the firmware from here http://www.sammobile.com/firmwares/ flash it using odin ...
or reinstall the firmware using kies
amboodx said:
I have flash my galaxy grand 2 with GenNxt custom rom, in that rom wifi is not working.
So I have tried to get back to official firmware 4.4.2 which I have updated before using custom rom.
But now after going to download mode it shows UDC START and it fails to flash, guys plz help me out....
In advance thanks.....
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?p=54668451
help cant flash stock rom 4.4.2 in galaxy garnd dous 2 via odin 3.9 [Solved]
You can check this thread the guy had his phone in sub brick form and he unbricked it...
plz do press the thanks button
I got G7 stock recovery from forum and I have recovered it using cwm, and get wifi back thanks to him for providing us the file and I want to get rid of that by getting stock rom G7 firmware, I have searched everywhere but :thumbdown: plz anybody can suggest me that if I flash with g8 to my g7 of another country it will be stock or stuck ......
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amboodx said:
I got G7 stock recovery from forum and I have recovered it using cwm, and get wifi back thanks to him for providing us the file and I want to get rid of that by getting stock rom G7 firmware, I have searched everywhere but [emoji107] plz anybody can suggest me that if I flash with g8 to my g7 of another country it will be stock or stuck ......
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Click to expand...
Click to collapse
If you really want to have stock rom instead of gennxt rom, you can initialize your firmware using kies. I did it. Previous it was not possible but now yiu can do so as G7 is available through kies. This lrocess will also unroot your device.
ok thanks Bro… I am trying… .
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[Q] Urgent Help

I have an s4 -GT i9500
i rooted my device via cf-autoroot
i have philz-touch recovery
i have installed many roms : Resurrection-Remix {5.1.1}
Bliss-Pop
Cm12
all have been flashed well but i can't connect to my cellular data.
it cant connect to my sim network. So simply, I can't call, sms, or use mobile data.
I dont have the 4gLte version of S4.
Please help me out.
I'm Desperate.
Thanks
Flash the stock modem again. Since you have an I9500 you should be able to flash the modem through your recovery.
What do you mean by modem ?
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Well, if you search the forums you'll find a thread with nothing but firmware packages for the cell radio and WiFi. That's the modem.
Thanks for the quick reply but please can you give me a link to a proper thread cause I could be mistaken. Thanks.
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No, because I'm not directory assistance. Use the search engine. That's what it's there for.
I found a thread but i cant find out whats my firmware number
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*#1234# in the dialer.
Does the firmware number change if you apply a custom rom ?
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amanraza704 said:
Does the firmware number change if you apply a custom rom ?
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Dial *#06# n see whether you still have your imei number and tell the result.

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