Develop Bugs

[Q] Poor mobile data connection after loss and subsequent reinjection of IMEI

Hello everyone, please excuse my noobness. I have spent two days now searching and trying to solve my issue, but no luck. Here are the series of events:
1. rooted i747 and got cwm 5.5
2. flashed liquidsmooth with cwm 5.5 and gapps
3. everything was fine (i think)
4. i tried to flash cm 10.1 with cwm 5.5 not realizing i needed 6.x and the flash failed
5. restored to my liquidsmooth back up
6. realized my imei was 0 at this point and no cell signal
7. used odin 3.07 to flash back to stock 4.1.1 rom from samsung
8. injected my imei using NV items reader writer method
After this sequence of events, regardless of the rom (stock, cm, liquidsmooth), my modem connects to LTE and is fine while i'm using it, but then after idling for 20 mins or more is on GPRS. Sometimes it has no data connection whatsoever. If i go to airplane mode and then come back out of airplane mode it will find the LTE tower and be fine again until I leave it alone or use it for more than 20 minutes.
I am using the correct APN (phone or pta on ATT)
my IMEI is correct under status in the about section in settings.
I have also done this : http://forum.xda-developers.com/showthread.php?t=2036891
i have also flashed my modem with this rom : I747UCDLK3_I747ATTDLK3_ATT (My baseband version is UCDLK3) from this thread: http://forum.xda-developers.com/showthread.php?t=1831898
The issue isn't that I can not connect to HSPA+ or LTE ... the issue is I lose that connectivity after 20-30 minutes and can not gain it back unless I toggle airplane on and off.
Any help or suggestions would be greatly appreciated.

I wanted to update this thread, in case others had the issue.
There was no solution that could be found. I ended up taking the phone in to ATT after resetting to factory defaults and resetting the flash counter. They replaced it and now on CM10.1.2 with normal functioning radio.

Network Data Hosed

I've gotten my phone into a state where I see signal bars, I can make calls and send texts, but no LTE or H+ is displayed and if I try do anything involving the internet it says there's no network connection. Wifi works just fine.
Here's how I got into the predicament. I should have learned my lesson from last time I flashed a Verizon ROM, but I didn't, and I flashed SkyNote RC9Z-3.9.1. Data works just fine in THAT ROM, but any subsequent ROM flashed after that... the network data is completely HOSED. I've tried enabling and disabling network data in settings. I've tried flashing the Devil kernel. I've tried restoring several different ROMS from nandroid backups. All restore fine and all have completely non-working network data. Last time I ran into this I had to flash the stock image in Odin to fiz the issue. This time however, that didn't work. The images flashed successfully, but upon reboot all I got was a a welcome screen bootloop of the samsung swirly logo and the T-Mobile logo.
I'm guessing this has something to do with the 4.3 bootloader? I'm downloading T889UVUCMK7_T889TMBCMK7_TMB.zip from SamMobile site and boy is it taking FOREVER! 7 hours left on the download. My thinking thoug is that If I unzip this new 4.3 firmware and flash it with Odin (or Kies if I absolutle have to) my device will start behaving again, and Network data will work, and I can go about ROM flashing and hopping again (though I'm gonna stay away from those Verizon ROMs let met tell you!).
Does anyone else have any other suggestions on what I can do to get my data back or to patch my bootloader to the 4.3 version? I was looking at this thread and wondering if it's safe to follow this procedure for patching once I have installed the 4.3 stock image:
http://forum.xda-developers.com/showthread.php?t=2500823
Any help is appreciated.

ddi you check your APN settings?

Probably your apn like iamsixnine said
Sent from my GT-I9305 using Tapatalk

[Q] Problem with Signal/Service - weak Signal, breakdowns

my device now: i9195, I9195XXUCNE6-DBT
I experience weak signal and many connection dropdowns. When this occured first, after i upgraded f4ktion Kernel 1.3.6 to 1.4.5 and
an older version of Carbon Rom (4.2.2) to 4.3 Carbon Rom. Until than everything was fine, flash of rom and kernel did not made any problem.
Btw i used Odin3 3.09 and clean install (step by step like in the guides) all the time.
After some days this realy annoyed me, so i went back to the older Carbon and kernel - problem still occurs.
So i went back to stock rom I9195XXUBML4-DBT (original was UBML4) - problem still existing.
Some time later f4ktion 1.5 and Carbon 4.4.4 was available, so i tried this..still no solution.
Now i am back to stock and updated to I9195XXUCNE6-DBT, same problem.
Some research told me many ne stuff to know..like flashing modem only. I tried some, nothing helped.
After hours of pointless googleing i noticed something on my phone.When i dont type the pin, i have normal signal. As soon as i type the pin
and "activate" my simcard, the signal strength drops. So i googled again and found this:
[Bug Watch] Android 4.3 Radio Bugs Causing Cell Connection Drops On Some Nexus 4 Handsets, Fixes In Sight (not allowed to post links)
I changed the network type to WCDMA only - it helped for some minutes(not many..maybe 2-3). I changed to GSM only and i had normal,
stable signal for like an hour. But later signal loses strenght again, and i need to change network type again.
I have the feeling, that its like a reset or restart of the radio.
But now i am all out of ideas and need some help.
Last thing i can do, is to bring it to repair. But my Knox says 0x1, so maybe you can help me before i ask Samsung.

I have similar problem since ugrading to KitKat roms. I had no problems with previous none Knox roms with MH3 modem but now with NE6 and NF7 KK modems the signal swings constantly up and down from 4 to 1 bars. This is in areas I previously had good signal. Internet also keeps dropping out requiring data toggling on and off. I've reflashed KK 20+ times and haven't been able to get rid of this problem yet.
I'm not sure if pre knox modems are installable but I intend to try and reflash MH3 modem, once I manage to do a successful backup.

I solved a similar problem by downgrade to 4.2.2 Brazil NE2, knox 2. Flashing separate modem (NE2), and reflashing full rom again. No problems for now

Now you stay on 4.2.2 ?
I dont understand why some people do have problems and some not. Is there different hardware version causing the trouble ?
Give me pls some information how you did the downgrade.
-Nandroid Backup
-philz
-Odin (if yes which version)
-why did you choose that rom
I tried to, but wasnt succesfull. I used Odin3 3.09 to flash 4.2.2 (UAMF5 i think) rom and got a brick. When trying to fix this nothing helped until i tried to flash with Odin3 3.04. But all i could do was flashing newest FW again. Did not test more after that, because i was very busy.
If you say that going back solved your problem, i will try again go go back myself. I've found some information on that and when its done i give some informations.

Same here, help?
I'm having the same problem with a newly acquired handset. I have full signal on some places and nothing on others, unfortunately in my house I have no signal! So it's quite exasperating.
My baseband version is I9195XXUCNE6
Android version is 5.0.2 with 3.4.0-cyanogenmod-g92aec50 [email protected] #1 kernel
Cyanogenmod version is 12-20150306-UNOFFICIAL-serranoltexx
Would it help if I flash a separate modem file through Odin? In that case, which one should I flash?
Any help would be appreciated a lot.
Thanks

franzasensi said:
I'm having the same problem with a newly acquired handset. I have full signal on some places and nothing on others, unfortunately in my house I have no signal! So it's quite exasperating.
My baseband version is I9195XXUCNE6
Android version is 5.0.2 with 3.4.0-cyanogenmod-g92aec50 [email protected] #1 kernel
Cyanogenmod version is 12-20150306-UNOFFICIAL-serranoltexx
Would it help if I flash a separate modem file through Odin? In that case, which one should I flash?
Any help would be appreciated a lot.
Thanks
Click to expand...
Click to collapse
If you have warrenty left then you should go to customer service then they will change your mainboard. and it would bw okay.

[Q] [Virgin Mobile] Galaxy S3 Lte Connection on CM 12

I recently rooted my s3, and flashed the Cyanogenmod 12.1-20150527-NIGHTLY-d2spr ROM.
3G and lower works great, but I am unable to connect to the LTE network. I initially believed it was an APN problem, and flashed this: (android forums -> virgin-mobile-mod-universal-lte-virgin-mobile-apn-fix-wip-cm-aosp-4-4-x.840298), without success. I tried updating/adding apns manually, but still am unable to connect to 4G.
My model is SPH-L710, and current baseband is L710VPUCNDC.
Let me know if you have any advice/solutions!

sudo!! said:
I recently rooted my s3, and flashed the Cyanogenmod 12.1-20150527-NIGHTLY-d2spr ROM.
3G and lower works great, but I am unable to connect to the LTE network. I initially believed it was an APN problem, and flashed this: (android forums -> virgin-mobile-mod-universal-lte-virgin-mobile-apn-fix-wip-cm-aosp-4-4-x.840298), without success. I tried updating/adding apns manually, but still am unable to connect to 4G.
My model is SPH-L710, and current baseband is L710VPUCNDC.
Let me know if you have any advice/solutions!
Click to expand...
Click to collapse
To get LTE, clean flash (wipe cache, system, and data on TWRP or use the "clean to install new ROM" option on PhilZ) the ROM, Gapps, and the APN fix and then boot up. As soon as your phone finishes booting up, turn it off, go into recovery, and dirty flash (don't wipe anything) the ROM and Gapps.
I used this on AICP 9.0 which is based on CM12.1, and I've heard this procedure works on CM12.1 and any CM12.1 based ROM.

[Q] CM 12.1 Lollipop 5.1.1 no mobile data issue! Help!

Hi there everyone, I managed to install the lollipop 5.0.x on my S3 Spring running on the Cleartalk Wireless Network which is a local company. The ROM worked well and I had working 3G mobile data, except for the camera which we all know doesn't work for sprint s3's on 5.0.x ROMs, so i decided to flash to 5.1.1 from this website: GalaxyS3root under the sprint s3 roms, the 5.1.1 one.
Everything went well, i could run the ROM and everything worked, camera, wifi, everything, except for one thing, 3G mobile data. I get signal, but no 3G data, there is an exclamation mark next to my signal. Ive tried rebooting, and it hasn't worked, ive searched for apn fixes, but none of them are for the Cleartalk Wireless network, i've found
apn fixes for boost and others only, so after more google searching i found out you could backup your apn settings and restore them, how does this work? I really enjoyed the
lollipop rom and if it wasn't for the 3G not working, i wouldve kept it, right now i just decided to flash my S3 to the stock firmware 4.4.2 and just root it. Any ideas fixes or suggestions that could fix the mobile connection on the 5.1.1 ROM? 3G has worked in every rom, (Carbon, lollipop 5.0, stock rom) but not in the 5.1.1 one, any help would be appreciated! Thanks!

er1ck194 said:
Hi there everyone, I managed to install the lollipop 5.0.x on my S3 Spring running on the Cleartalk Wireless Network which is a local company. The ROM worked well and I had working 3G mobile data, except for the camera which we all know doesn't work for sprint s3's on 5.0.x ROMs, so i decided to flash to 5.1.1 from this website: GalaxyS3root under the sprint s3 roms, the 5.1.1 one.
Everything went well, i could run the ROM and everything worked, camera, wifi, everything, except for one thing, 3G mobile data. I get signal, but no 3G data, there is an exclamation mark next to my signal. Ive tried rebooting, and it hasn't worked, ive searched for apn fixes, but none of them are for the Cleartalk Wireless network, i've found
apn fixes for boost and others only, so after more google searching i found out you could backup your apn settings and restore them, how does this work? I really enjoyed the
lollipop rom and if it wasn't for the 3G not working, i wouldve kept it, right now i just decided to flash my S3 to the stock firmware 4.4.2 and just root it. Any ideas fixes or suggestions that could fix the mobile connection on the 5.1.1 ROM? 3G has worked in every rom, (Carbon, lollipop 5.0, stock rom) but not in the 5.1.1 one, any help would be appreciated! Thanks!
Click to expand...
Click to collapse
Same issue here.
I am on NJ2 baseband (modem).

finally found a solution!!!
for everyone loosing their 3G data after installing the 5.1.1 or any other rom... this is what worked for me... backing up apn's with "apn backup and restore" app from the play store in the stock rom ... then after installing the lollipop rom... just restore apn's. There are tutorials on how to do that ... just google for "apn backup and restore tutorial". :good: