Develop Bugs

[Q] S4 mini LTE flashed with KK then reverted to JB, internet connectivity limited

So, I rooted my S4 Mini LTE. then I flashed it with KK version of Carbon Rom (not intended). I have then reflashed it to Carbon rom JB version. Everything seems to be working except the data connection. It works sometimes, but more often not. I have reflashed it to Pacman, available here, internet connectivity is still the same...
The fact that it sometimes works excludes a lot of things. APN is fine, I checked it and it wouldn't work at all otherwise. Could it be that I messed something up when I flashed it with KK rom?
What could I do to fix it?
I'll try unrooting it and returning to stock to see if it will fix it, but I have my doubts....
Do you have any suggestions? All I want is my data connections working reliably again, device rooted or not...
EDIT:
I have reverted my phone to stock. It's the same as it was when I got it, except for thw KNOX and warranty part. Since my warranty is void anyway, it's really a shame to use stock rom with all the crapware on it.
Do you have any ideas that would cause mobile data to work on stock, but not on any other rom?

Karlovsky120 said:
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Do you have any ideas that would cause mobile data to work on stock, but not on any other rom?
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Maybe your KK ROM was made from ROM with modem that was intended for other country. Often modems, intended for one country/region, work badly or don`t work in other countries due to differences in service providers' settings.

djtyta said:
Maybe your KK ROM was made from ROM with modem that was intended for other country. Often modems, intended for one country/region, work badly or don`t work in other countries due to differences in service providers' settings.
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How can I check that? Is there anything I can do to fix it?

NOT Registered to network after upgrade / cannot call and cannot send sms

good morning! can someone really help me? i have upgraded the firmware of my Gt-N7100 from 4.1 to 4.4 but after flasing, my mobile cannot register on the network anymore. Then i tried downgrading, from 4.4 to 4.3 but its still cannot I connect to the network. Just now i tried to upgrade it again to 4.4 but still doesnt work. it has signal on but everytime i call it says not registered on the network. It also has signal even i remove my battery. I am really bothered. does my phone broken already? i am from the Philippines and the firmware i have now is N7100XXUFNG4_N7100OLBFHG1_SMA, all the firmware i used came here from sammobile. can someone please help me...

flegisma08 said:
good morning! can someone really help me? i have upgraded the firmware of my Gt-N7100 from 4.1 to 4.4 but after flasing, my mobile cannot register on the network anymore. Then i tried downgrading, from 4.4 to 4.3 but its still cannot I connect to the network. Just now i tried to upgrade it again to 4.4 but still doesnt work. it has signal on but everytime i call it says not registered on the network. It also has signal even i remove my battery. I am really bothered. does my phone broken already? i am from the Philippines and the firmware i have now is N7100XXUFNG4_N7100OLBFHG1_SMA, all the firmware i used came here from sammobile. can someone please help me...
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How did you flash the firmware? Using ODIN or recovery?
Do you have a nandroid backup? If yes, restore that backup & see where you go.
Ravi.

[Q] Help Needed

I have a N7100 I bought it outside if US, now I am in US and using T-mobile. I tried flashing the T889 Jedi Master 18 rom to my phone in order to get the wifi calling feature. However, now my Wifi is not working and my phone does not have service.
Please help

The problem with the phone is that you have flashed a rom that was not meant for your device and so therefore, due to problems with the modem being different, you are having all these connectivity issues. The way to fix this would be to go back to stock rom/roms specific to the N7100!

[Q] Flash modem on non-rooted ROM via Odin. Possible?

Hi fellow xdaers,
have been a while since i last flash / rooted an android device.
i have a T805Y running KitKat when I bought it from Telstra (Australia). i have then flash the generic Lollipop ROM (T805YDOU1BOG1_T805YXSA1BOG1_T805YDOU1BOG1_HOME) using Odin.
since then, i am having random lose of 4G connection and no way of getting back my mobile connection until a reboot.
does anyone knows if I can load a Telstra modem (perhaps a modem from KitKat using Odin (not rooted). my suspicion is that the gneric Lollipop ROM is not liking Telstra 4G sim card. i have to restart my T805Y every 2 days. disabling mobile network/enable flight mode still does not work for me.
my access point is telstra.wap.
when the 4G connection goes offline, i am not able to make any changes to APN/network mode. when i select network operators, it says 'can't connect'
restart is the only choice for me.
Thank you.

If you find out let me know please. I have the same model and would like to install custom roms but I think our model has the extra 700mhz LTE band needed for Telstra 4GX.

Can't connect to network after restoring LG G2 LS980 to stock

Hello,
I followed this guide to restore my sprint LG G2 to stock Kitkat 4.4.2. Everything went fine, the phone is working, the only problem I have is that I can't connect to any network. The phone is not recognizing any of the local network providers. I bought this phone on ebay and it came with a custom rooted rom installed on it, so I decided to "clean up the mess" and restored stock kitkat. As I mentioned before everything went fine, but the network is not working (it was working with the android version before i restored stock 4.4.2). Maybe its because I'm not living in the USA (I'm from Bosnia/Europe). Should I flash a different radio on it? The phone is updating atm with OTA and I'm pretty sure that the updates wont help. Did anyone else had these issues? Any help would be highly appreciated.
Update: My phone just got upgraded to Lollipop, but the network issue is still present
Update 2: I just reinstalled "cm-12.1-20151031-NIGHTLY-ls980" Lollipop 5.1.1. and it had no problems to find all the networks in my area, so this clearly has to do with stock LG android 4.4.2.

When you say you can't connect to network, are you referring to your mobile carrier network, or like WiFi?
If it's your mobile carrier that you can't connect to, you might need to switch your radio. Take a look at this guide and the section about using radio switcher: http://forum.xda-developers.com/sprint-g2/help/how-sprint-lg-g2-ls980-to-t-mobile-t3230685

Fuzz1303 said:
When you say you can't connect to network, are you referring to your mobile carrier network, or like WiFi?
If it's your mobile carrier that you can't connect to, you might need to switch your radio. Take a look at this guide and the section about using radio switcher: http://forum.xda-developers.com/sprint-g2/help/how-sprint-lg-g2-ls980-to-t-mobile-t3230685
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Hey there. Sorry for the late response. I kinda gave up on making the stock LG ROM work, which is why I kept on using CM12.1 . What I was referring to was my mobile carrier. The phone has no problems connecting to any WiFi signal.
I didn't try to flash any radios at all after restoring the LG G2 stock ROM. Maybe I should have tried one of the radios from this CM12.1 for LG G2 tutorial. Here is a direct LINK to the full list of LG G2 radios, where I downloaded the radio for my phone. I'm not sure if the other LS980 Radios would work on my device. There are 4 different radios available for the LG G2 LS980.
Do you think flashing one of these radios would help solving this problem after restoring the LG stock ROM?