Develop Bugs

[Q] Rooted, Carbon ROM, Mobile data and Wifi problems

So I have rooted my S4 Mini, as described here and installed JellyBean version of Carbon rom for S4 Mini LTE (i9195, my model).
I used this guide when rooting and I used this rom version.
Everything works as should, but my data network is behaveing strangely. It's not that it's not working, it does connect to via H+, 3G (which imediatley turns into DC which is something I haven't seen on stock rom). But it connects only sometimes and doesn't work at other times in places where it definitly should. And 4G never works (in places it worked on stock).
Disregard Wi-fi part, I had some issues with my router, there was never a problem with my phone (at least regarding the Wi-Fi)
My APN is fine, it wouldn't be able to connect otherwise (and I checked the settings).
Any ideas?
Ask for any additional information. =)

Karlovsky120 said:
So I have rooted my S4 Mini, as described here and installed JellyBean version of Carbon rom for S4 Mini LTE (i9195, my model).
I used this guide when rooting and I used this rom version.
Everything works as should, but my data network is behaveing strangely. It's not that it's not working, it does connect to via H+, 3G (which imediatley turns into DC which is something I haven't seen on stock rom). But it connects only sometimes and doesn't work at other times in places where it definitly should. And 4G never works (in places it worked on stock).
Disregard Wi-fi part, I had some issues with my router, there was never a problem with my phone (at least regarding the Wi-Fi)
My APN is fine, it wouldn't be able to connect otherwise (and I checked the settings).
Any ideas?
Ask for any additional information. =)
Click to expand...
Click to collapse
I hope somebody else knows, but if you don't find any solution just change the rom

FOUND FIX!!!
I too had this problem on 4.3.1 carbon rom. I wiped data using recovery boot and at first it didn't help. But it started working again in a few seconds. Magical fix. Let me know if this works for you too.

Karlovsky120 said:
So I have rooted my S4 Mini, as described here and installed JellyBean version of Carbon rom for S4 Mini LTE (i9195, my model).
I used this guide when rooting and I used this rom version.
Everything works as should, but my data network is behaveing strangely. It's not that it's not working, it does connect to via H+, 3G (which imediatley turns into DC which is something I haven't seen on stock rom). But it connects only sometimes and doesn't work at other times in places where it definitly should. And 4G never works (in places it worked on stock).
Disregard Wi-fi part, I had some issues with my router, there was never a problem with my phone (at least regarding the Wi-Fi)
My APN is fine, it wouldn't be able to connect otherwise (and I checked the settings).
Any ideas?
Ask for any additional information. =)
Click to expand...
Click to collapse
Hi, I'm install the [ROM][UNOFFICIAL][4.4.4] CarbonRom KitKat Weekly's [S4 Mini 3G/LTE/3GDS] [app2sd] on my S4 Mini I9195 LTE and I have no problems with the data network... you could try that ROM, is awesome.
The only issue i have is in the Lockscreen... can't set the weather option in the Lockscreen... the Lockscreen no shows the wheather.
If any can help me with how do that, I will apreciated...... (sorry for my bad english... I'm from South America).
Cheers!

Karlovsky120 said:
So I have rooted my S4 Mini, as described here and installed JellyBean version of Carbon rom for S4 Mini LTE (i9195, my model).
I used this guide when rooting and I used this rom version.
Everything works as should, but my data network is behaveing strangely. It's not that it's not working, it does connect to via H+, 3G (which imediatley turns into DC which is something I haven't seen on stock rom). But it connects only sometimes and doesn't work at other times in places where it definitly should. And 4G never works (in places it worked on stock).
Disregard Wi-fi part, I had some issues with my router, there was never a problem with my phone (at least regarding the Wi-Fi)
My APN is fine, it wouldn't be able to connect otherwise (and I checked the settings).
Any ideas?
Ask for any additional information. =)
Click to expand...
Click to collapse
same problem. Do you use a 3G or 4G signal from your network provider ?

Possible fix for you
sheky01 said:
same problem. Do you use a 3G or 4G signal from your network provider ?
Click to expand...
Click to collapse
Hi again, i spent hours trying to fix this and came up with a solution:
Make a back up of your current rom
Use Odin to flash the I9195XXUBMJ7_I9195OXABMJ7_DBT file ( can provide if needed ) to go back to stock firmware
Make note of the APN settings of the stock firmware, then restore the back up and change the apn settings to the same as the stock and it should work.
This worked for me.

Went back to stock and it worked well enough (as intended). However I just installed the official Cyanogen ROM and it works like a charm. Latest nightly build (01.02.2014.)

[Q] wifi not working after updating

I updated my rooted G3 running stock rom using the LG Support Tool today, but the wifi does not seem to work after updating. When I open up the wifi tab, the wifi is switched off, so i switch the wifi on, however, it would not detect any wifi networks at all. The box where it usually lists wifi network still says "turn wi-fi on in the upper right corner to see available devices", but ive already switched wifi on. the wifi was working just fine when it was running kitkat

wsitu said:
I updated my rooted G3 running stock rom using the LG Support Tool today, but the wifi does not seem to work after updating. When I open up the wifi tab, the wifi is switched off, so i switch the wifi on, however, it would not detect any wifi networks at all. The box where it usually lists wifi network still says "turn wi-fi on in the upper right corner to see available devices", but ive already switched wifi on. the wifi was working just fine when it was running kitkat
Click to expand...
Click to collapse
Do a factory reset. You would probably run into other problems like chrome not knowing where the sd card is when trying to download. I thought it was running perfect but ran into the sd thing, then I noticed my wifi was bugged. All my problems where fixed after a factory reset. Important to note that I didnt use the kdz to update instead I used a twrp zip I made. Another note, pretty sure that I dirty flashed from kitkat that last time when I noticed the problems (fashed both ways for testing).

D855 running 21A cannot see 5Ghz WIFI hotspot

So I just restored my phone to stock (21A KDZ) using the flashtool. I have no problems connecting to the 2.4Ghz WIFI hotspot but it cannot see the 5Ghz one.
steps I've tried:
1. turning WIFI on/off
2. I've restored it to stock via flashtool twice
3. performed factory reset via stock recovery.
My Macbook and 6s+ are both connected to the net using the 5Ghz hotspot so that's not the issue. When the phone was running cm12.1, it was connected to the 5Ghz hotspot too.
Any ideas what could be wrong?
Thanks

bump!

mrjayviper said:
So I just restored my phone to stock (21A KDZ) using the flashtool. I have no problems connecting to the 2.4Ghz WIFI hotspot but it cannot see the 5Ghz one.
steps I've tried:
1. turning WIFI on/off
2. I've restored it to stock via flashtool twice
3. performed factory reset via stock recovery.
My Macbook and 6s+ are both connected to the net using the 5Ghz hotspot so that's not the issue. When the phone was running cm12.1, it was connected to the 5Ghz hotspot too.
Any ideas what could be wrong?
Thanks
Click to expand...
Click to collapse
I came from cloudy 2.5 It saw the lower (36-48) channels only.
Have you tried Marshmellow 30b? My phone can now not only see the lower channels @ 5ghz, but it can also now see the higher channels (149-165) although there is a bug where if you enable wifi hotspot and turn it off, it will only see the lower channels until you reboot the phone.

mrjayviper said:
So I just restored my phone to stock (21A KDZ) using the flashtool. I have no problems connecting to the 2.4Ghz WIFI hotspot but it cannot see the 5Ghz one.
steps I've tried:
1. turning WIFI on/off
2. I've restored it to stock via flashtool twice
3. performed factory reset via stock recovery.
My Macbook and 6s+ are both connected to the net using the 5Ghz hotspot so that's not the issue. When the phone was running cm12.1, it was connected to the 5Ghz hotspot too.
Any ideas what could be wrong?
Thanks
Click to expand...
Click to collapse
Try this:
http://forum.xda-developers.com/showthread.php?t=1982149
It was Featured on the homepage:
http://www.xda-developers.com/change-your-wifi-country-code-to-access-wifi-networks-on-all-channels/

LG G3 4G Network Drops

So the problem I'm having with my G3 is that the Network either drops and comes back repeatedly or completely drops and does not return. This only happens on 4G. When I go into network settings and change network mode to 3G it works fine and I get a constant signal all the time.
I have been using Fulmics ROM and I thought maybe that was the issue. But it wasn't.
I tried 3 different sims from three different carriers (Three, EE, O2) on several stock firmwares. (20N, 21C, 30A, 30F).
Each scenario is the same; network drops when phone is on 4G network mode, but its fine on 3G mode.
However, I have noticed that if I leave Wifi OFF allowing 4G data to connect first, then its fine. I can even turn Wifi ON again and the network is stable. I can even turn Wifi and Data OFF and the network is still stable.
But, if I toggle aeroplane mode, where Wifi connects first or where Wifi and Data is turned OFF; I am back to the network dropping.
Also, I live in London UK so there should not be any signal issues. Can anyone tell me why this is happening. I doubt it's software issue as I've tried several firmwares.
Any help is appreciated.

Mate I'm afraid there is a high possibility it's the Fulmics ROM.. I'm still trying to read up on the issue myslef, there's a ton of reports in the Fulmics thread and around.

I'm using an UK bought LG G3 as well (from Three) and started experiencing similiar issues after I flashed Fulmics. Even tried rolling back to 4.4.2 using a .tot file but didn't really help me.
Still scouring all around trying to find how to fix the issue..

engmia said:
Mate I'm afraid there is a high possibility it's the Fulmics ROM.. I'm still trying to read up on the issue myslef, there's a ton of reports in the Fulmics thread and around.

I'm using an UK bought LG G3 as well (from Three) and started experiencing similiar issues after I flashed Fulmics. Even tried rolling back to 4.4.2 using a .tot file but didn't really help me.
Still scouring all around trying to find how to fix the issue..
Click to expand...
Click to collapse
Hmmm looking back now this issue did start when I first installed fulmics 3.5. But shouldn't everything revert back to stock when you reinstall stock firmware.

thufz9585 said:
Hmmm looking back now this issue did start when I first installed fulmics 3.5. But shouldn't everything revert back to stock when you reinstall stock firmware.
Click to expand...
Click to collapse
That's what I thought but I guess it's a little bit more tricky.
Anyways I think I managed to restore some kind of stability in the signal, still unsure about the process though. Seems that different stuff are working for different people. In a few days I hope to have some information to give you how to fix it.
In the meantime try checking the Fulmics thread for ideas and suggestions (that's where I start off from).

engmia said:
That's what I thought but I guess it's a little bit more tricky.
Anyways I think I managed to restore some kind of stability in the signal, still unsure about the process though. Seems that different stuff are working for different people. In a few days I hope to have some information to give you how to fix it.
In the meantime try checking the Fulmics thread for ideas and suggestions (that's where I start off from).
Click to expand...
Click to collapse
Yeah let me know when you find a fix. Really appreciate the help.
One thing that is sort of a temporary fix for me, works on Three, EE and O2 (only ones i tried), is connecting Data first when on 4G mode.
So if I toggle airplane mode and if Wifi connects first then the network drops or keeps refreshing.
But, if I leave Wifi OFF and Data establishes a connection; the network is stable and I can then turn Wifi On again and the network will remain stable.
I just have to make sure the network does not lose connection (i.e. tunnel or airplane mode), and if it does ensure Data connects first.
Also, another thing. After I reinstalled Fulmic 5.3 it seems 4G mode is sort of stable. As in when on 4G mode instead of dropping the network it connects via 3G automatically. But this only happens with Three.

thufz9585 said:
Yeah let me know when you find a fix. Really appreciate the help.
One thing that is sort of a temporary fix for me, works on Three, EE and O2 (only ones i tried), is connecting Data first when on 4G mode.
So if I toggle airplane mode and if Wifi connects first then the network drops or keeps refreshing.
But, if I leave Wifi OFF and Data establishes a connection; the network is stable and I can then turn Wifi On again and the network will remain stable.
I just have to make sure the network does not lose connection (i.e. tunnel or airplane mode), and if it does ensure Data connects first.
Click to expand...
Click to collapse
Okay here is what worked for me - open this guide and download the Three specifiic Lollipop and Marshmallow .kdz files.
Flash the stock Marshmallow firmware first using the LG Flash Tool method. Your phone probably won't automatically get recognized since you're running Fulmics now so you'll need to change the COM port as described in post #
After that downgrade to stock Lollipop using the LGUP method. Personally I downloaded more updated (I think, not sure) files from here.
Then I proceeded to re-root and clean install Fulmics 5.1 and the 5.2 and 5.3 OTA updates from recovery. Booted and network works without drops now with 4G connectivity.
thufz9585 said:
Also, another thing. After I reinstalled Fulmic 5.3 it seems 4G mode is sort of stable. As in when on 4G mode instead of dropping the network it connects via 3G automatically. But this only happens with Three.
Click to expand...
Click to collapse
I changed my carrier and got an automatic SMS with configuration for my phone and instructions to save it. I should've known something was fishy when I recieved the "congratulations for setting up" message even before I recieved the actual settings. Anyways 4G was running fine on my new carrier with 32 mbps speed which is okay, much better compared to the same carrier 3G network, however I only had 3 bars of connection so I gussed what the heck, I should save that configuration after all, it might make things better. What a bloody mistake. I lost 4G connectivity and my phone refused to connect to the 4G network, only 3G (just as you describe).
What worked for me in this scenario was wiping the cache and dalvik (not really sure this step is even necessary to be honest, but I was headed for a full rom re-wipe anyway and decided to try with this first), going into the hidden menu and choosing LTE only connectivity (Fulmics Tweaks -> Hidden Menu [or the hidden code for the phone app if you decided to stay on stock, which I dont have] -> Modem Protocol -> RAT Selection -> LTE only. At this step my phone got to the usual 3 to 4 bars of connectiviy but was displaying "Emergency mode only" and no data at all. I proceeded to Settings -> Networks -> More -> Mobile Networks -> Access point names -> Reset to default from the menu. If network mode doesn't change back to GSM/WCDMA/LTE auto automatically, change it back manually. At this point I had restored back my 4G connection and everything is working normally (30-32 mbps connection stationary in my house through a wifi hotspot next to my laptop).
Good luck, I would follow the steps as described just in case. I tried many reflashes before that should've worked but didn't for me. However different things work for different people, hope this works for you and please report back

engmia said:
Okay here is what worked for me - open this guide and download the Three specifiic Lollipop and Marshmallow .kdz files.
Flash the stock Marshmallow firmware first using the LG Flash Tool method. Your phone probably won't automatically get recognized since you're running Fulmics now so you'll need to change the COM port as described in post #
After that downgrade to stock Lollipop using the LGUP method. Personally I downloaded more updated (I think, not sure) files from here.
Then I proceeded to re-root and clean install Fulmics 5.1 and the 5.2 and 5.3 OTA updates from recovery. Booted and network works without drops now with 4G connectivity.
Click to expand...
Click to collapse
I'd like to thank you so much for this information! I was having signal drop issue after installing Fulmics ROM. Tried to flash stock ROM but no success. After doing the downgrade via LGUP method to LP my phone is getting full signal again (at least I didn't notice any drop until now).
Thank you!

waltertakashi said:
I'd like to thank you so much for this information! I was having signal drop issue after installing Fulmics ROM. Tried to flash stock ROM but no success. After doing the downgrade via LGUP method to LP my phone is getting full signal again (at least I didn't notice any drop until now).
Thank you!
Click to expand...
Click to collapse
Glad I could be of help!

engmia said:
Okay here is what worked for me - open this guide and download the Three specifiic Lollipop and Marshmallow .kdz files.
Flash the stock Marshmallow firmware first using the LG Flash Tool method. Your phone probably won't automatically get recognized since you're running Fulmics now so you'll need to change the COM port as described in post #
After that downgrade to stock Lollipop using the LGUP method. Personally I downloaded more updated (I think, not sure) files from here.
Then I proceeded to re-root and clean install Fulmics 5.1 and the 5.2 and 5.3 OTA updates from recovery. Booted and network works without drops now with 4G connectivity.
Click to expand...
Click to collapse
Sorry for the late reply.
I followed your instructions and unfortunately it didn't work. :crying:
I first tried with the D85520f you provided and then with an updated D85521C firmware. But nothing worked.
The temporary fix, which I found works, is to ensure 4G mobile data establishes a connection first before Wifi (turn Wifi OFF then ON after data established). Then there is no signal drop until I go through a tunnel or phone restarts (signal drops completely), which means again i have to ensure 4G mobile data establishes a connection before Wifi or else it'll go back to the constant signal dropping.
Guess I'll just stick with 3G at all times. I've spent too much time trying to correct this than actually finding enjoyment in using the phone.
Anyway really appreciate the time and effort you took to help with this annoying situation. :good::good::good:

thufz9585 said:
Sorry for the late reply.
I followed your instructions and unfortunately it didn't work. :crying:
I first tried with the D85520f you provided and then with an updated D85521C firmware. But nothing worked.
The temporary fix, which I found works, is to ensure 4G mobile data establishes a connection first before Wifi (turn Wifi OFF then ON after data established). Then there is no signal drop until I go through a tunnel or phone restarts (signal drops completely), which means again i have to ensure 4G mobile data establishes a connection before Wifi or else it'll go back to the constant signal dropping.
Guess I'll just stick with 3G at all times. I've spent too much time trying to correct this than actually finding enjoyment in using the phone.
Anyway really appreciate the time and effort you took to help with this annoying situation. :good::good::good:
Click to expand...
Click to collapse
Modem 21C should be your answer! Please try with that.

Is anyone still out there
engmia said:
Modem 21C should be your answer! Please try with that.
Click to expand...
Click to collapse
I flashed dummies and get dropped 4g data like this.
I have tot back to stock and didn't help... not Kdz
Haven't downgraded yet to LP yet.
On turborom now.
Can I just flash this modem? Have a link to the 21c modem?
Flash in twrp or send via LG flash?

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...