G3 data working on stock but not on custom roms - G3 Q&A, Help & Troubleshooting

Hey, I noticed recently that my data has stopped working all together for custom roms on my LG G3 D852 (fido network). I thought it may have been a hardware issue so I reverted back to stock and everything worked. I tried different modem versions yet that didnt seem to work either. My APN settings are the exact same for both stock and the custom roms I have tried (Fullmics 4.1 ,4.2, CM13 various nightlies, and CM 12.1.) All these roms were clean flashed with TWRP 3.0 . Selecting a network provider out of the list turns off service all together unless i choose (select automatically).
Does anyone know what the issue could possibly be? Any help would be gratefully appreciated. Thank-you

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Mobile data not working +STOCK ROM

Hi everyone,
I have LG G3 d855 (Europe version). I bought it online, not at any network. I had an lollipop update really fast (Poland). Yesterday I rooted the phone, it worked fine, and installed the BlissPop rom. I missed the Quick Circle option though, so today I installed the ChupaChups rom for lollipop. And now my problem: The mobile data connection is not working. I can make calls, send texts, connect via wifi, but the data connection over the network is not working at all. I went back to stock - I downloaded and installed the European version using kdz method, it didn't help, so I did it over LG Flash Tool. It still does not work. Do you have any ideas, what to do with this? I feel like I'm going to cry, I'm very nervous about it, because I use mobile data almost all the time...
Maybe there's something wrong with the modem driver? I really hope someone is able to help me. Thank you in advance!
Edit: Maybe I used the wrong stock rom? I don't even have the option to update to lollipop anymore.
CaPlanePourMoi said:
Hi everyone,
I have LG G3 d855 (Europe version). I bought it online, not at any network. I had an lollipop update really fast (Poland). Yesterday I rooted the phone, it worked fine, and installed the BlissPop rom. I missed the Quick Circle option though, so today I installed the ChupaChups rom for lollipop. And now my problem: The mobile data connection is not working. I can make calls, send texts, connect via wifi, but the data connection over the network is not working at all. I went back to stock - I downloaded and installed the European version using kdz method, it didn't help, so I did it over LG Flash Tool. It still does not work. Do you have any ideas, what to do with this? I feel like I'm going to cry, I'm very nervous about it, because I use mobile data almost all the time...
Maybe there's something wrong with the modem driver? I really hope someone is able to help me. Thank you in advance!
Edit: Maybe I used the wrong stock rom? I don't even have the option to update to lollipop anymore.
Click to expand...
Click to collapse
Seems like a modem baseband was flashed somehow.
Flash the modem back to the correct stock version you had and it should fix the problem
tiguy99 said:
Seems like a modem baseband was flashed somehow.
Flash the modem back to the correct stock version you had and it should fix the problem
Click to expand...
Click to collapse
Do you know where I can find those modem drivers?
Edit: I checked which version of software I should use with my IMEI no. It's 20h. Would it be enough to flash the stock rom over kdz, or do I have to find somewhere the modem driver for this version? If yes, do you have any idea where can I find it?
Thanks.
CaPlanePourMoi said:
Do you know where I can find those modem drivers?
Edit: I checked which version of software I should use with my IMEI no. It's 20h. Would it be enough to flash the stock rom over kdz, or do I have to find somewhere the modem driver for this version? If yes, do you have any idea where can I find it?
Thanks.
Click to expand...
Click to collapse
Not sure.
I have the G2 and we have these files in our Development Section where you find ROM files etc.
Should be there as flashable zip files in the same section for the G3
tiguy99 said:
Not sure.
I have the G2 and we have these files in our Development Section where you find ROM files etc.
Should be there as flashable zip files in the same section for the G3
Click to expand...
Click to collapse
Ok, thanks! Last question before I do the final step - I have the ROM I am supposed to have. I rooted the phone, installed TWRP. I've also found the modem driver for my rom. And the question is - how should I flash the driver? Should I mount system or do anything apart from just installing the zip? Should I clear any cache?
@CaPlanePourMoi Wipe the modem partition in Recovery and then just flash the modem zip which will replace it. If that doesn't work, you can go back to BlissPop that includes it's own Modem and install Xposed for 5.1 Super-Alpha and the QuickCircle Mod for AOSP, all 3 of those I'm using with no issues whatsoever!
So I installed the modem driver (20h) yesterday, but it didn't help. I decided to install the BlissPop ROM, and mobile data (with LTE) works just fine. I will go back to the problem on Saturday and keep you up to date. Thanks!
Update
Update: Hey everyone - it seems like I didn't find any solution. I tried to go back to the ROM based on stock again (it was Cloudy this time), but the modem still didn't work. It was acutally working for a few seconds (I had 4G connection), but then again it was lost and it didn't connect anymore. Wifi works fine. Do you have any ideas on how I can flash the modem correctly? And how can I uninstall the modem that I have now in recovery? I didn't do that, because I cannot find this option.
Thanks in advance!
CaPlanePourMoi said:
Update: Hey everyone - it seems like I didn't find any solution. I tried to go back to the ROM based on stock again (it was Cloudy this time), but the modem still didn't work. It was acutally working for a few seconds (I had 4G connection), but then again it was lost and it didn't connect anymore. Wifi works fine. Do you have any ideas on how I can flash the modem correctly? And how can I uninstall the modem that I have now in recovery? I didn't do that, because I cannot find this option.
Thanks in advance!
Click to expand...
Click to collapse
I have a very similar issue
my LG G3 is the D855 on AT&T , and was working fine on Cloudy 2.2 or 2.3 Lolipop without any issues!
All of a sudden last Friday 5/22/2015, mobile data stopped working, but WiFi is still okay.
I just did a full wipe, updated APN, and the issue still there
I haven't change any major things in probably 2 months, not sure what's going on.
Finally, contacted AT&T, and made sure that they remove from the network,a put my back(troubleshooting). As well as changing the sim, and APN, but nothing worked!!
PLEASE HELP!!!!!!!!!!!!
UPDATE: So my last attempt, I contacted my provider AT&T, and they requested to try a default APN settings, even though what I used was working fine.
I did, and immediately my mobile data was back!!
Everything is working back as normal, and for some reason the network APN required updating
Did almost the same few days ago! I have finally solved my problem. Here's the explanation:
In Poland we had a network called "Era", a few years ago it was bought by T-Mobile. I searched the internet for T-Mobile APN settings in Poland and it didn't work. I have also found the APN settings for the old network, "Era" and surprisingly it's working. I don't know why T-Mobile settings don't work while they do for other people (and at this point I'm too afraid to ask. )
HI, i have the same problem on my d855 with wind (i'm in italy), i was rooted with custom rom and when i came back to stock i lose data connection. What i have to do? what do u mean for restore default apn? the default of my carrier? or the default for g3?

[Q] No data connection after installing custom rom- Not an APN issue

I've been looking around for quite some time now and I can't find anyone with answers, so I'll try here.
I recently switched from Cloudy 2.5 to Exodus Nightlies. After setting up the rom, I noticed that I couldn't connect to data. I've had this problem before and it was always just an APN issue. So, I put in my usual APN settings and assumed all would be solved. Quite the contrary, there is still no data connection in sight. I've now cycled through every possible APN combination; toggled data, airplane mode, and LTE; tried "killall rild" command; and did a clean reflash of exodus.
I'm honestly out of ideas aside from a full reset, which I'd like to avoid if possible. I'm hoping someone here can offer some advice.
I'm currently using the following specs:
LG G3 international version (D855)
Exodus Nightlies rom (5.1.1)
Straighttalk service
Latest TWRP
Xposed
Thanks in advance!
I have the same problem after flashing stock v20u, i tried to flash also kdz or tot but doesn't change. How did u resolve?

No Network

Hi
I have a LG G4 H815, I have been running the latest Imperium Rom for 3 weeks without any issues when all of a sudden today I cannot get any network. coverage at all. I have reflashed Imperium, flashed CM13, performed several KDZ clean installs using different firmware (20D, 20G, 20H), tried flashing different modems and nothing works.
My apn settings are all correct and the phone is quite new and hasn't been dropped or anything.
I have tried my sim card in other phones and it works fine, so I think the problem lies with the handset.
I'm at a bit of a loss what to try next, if anybody can help it would be much appreciated.
Thanks

LG G3(D855) Complete Signal Loss while Wifi is activated.

Hey guys,
i recently clean Updated from Fulmics 2.7 to latest 7.5. Everything worked fine until i suffered from Network completely droping while Wifi is active.
I tried different scenarios. The Bug is now reproducible.
1. LTE/3G/2G Auto Mode + Wifi >> Signal loss
2. LTE/3G/2G Auto Mode without Wifi active >> Signal stays active
3. 3G/2G Auto Mode + Wifi >> Signal stays active
4. LTE/3G Auto Mode + Wifi >> Signal loss
I tried almost every Modem available for the G3 in development section(21A,21C, Those hybrid types etc.). I tried different Roms now (Cloudy, Fulmics 7.0, ZOEs).
I made a clean install of the original Firmware (V30B via LGFlashTool). Reinstalled my Backup from Fulmics 2.7
Then i tried setting different APN Settings and tried messing around with LTE Bands in the hidden Menu. But nothing worked so far.
The Issue stays over all Roms and Firmwares and Modems and Fixes i tried
I really don't know what i can do now to fix this. Maybe s.o. got a Clue or Hint what else i can try.
The LTE function is essential for me because my Provider (O2 Germany) only builds LTE Networks and 3G got less coverage here.
The only thing i can imagine is that the SIM Card or the SIM Card Holder somehow got damaged??? The Card worked proper with Fulmics 2.7 for about 2 years now. Until the Update.
Thanks in advance
Bananaphone64
No one suffers from this?
Having Ressurrection Remix installed now and it works fine. So it has something to do with the Stock LG Rom?
Bananaphone64 said:
No one suffers from this?
Having Ressurrection Remix installed now and it works fine. So it has something to do with the Stock LG Rom?
Click to expand...
Click to collapse
I was having this problem on Fulmics rom but it was not total loss of signals. It keeps on connecting and disconnecting after few seconds. Stock works fine though.
I have the same problem. Using T-mobile lg g3 d855.
Trying to resolve still...

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