Develop Bugs

[Q] Wifi and data connection issues with CM11-20140122

Yesterday I upgraded my Galaxy W to CM11-20140122 as per the instructions on the developer section of this site. Everything went smoothly and I connected the phone to my home wifi and update and reinstalled all my apps. No problems. Thismorning though, I'm experiencing wifi and data over network connection issues. For some reason, although I can see the wifi networks and I'm notified that there are networks available, I cannot connect to them - even though I could previously! The same thing happens with my mobile network - the network is connected and I can make calls and send texts but I persistently get 'No service' and no data connection.
If anyone has any ideas how I fix this I'd appreciate it? Is anyone else is having the same kind of issues? I was thinking of upgrading to kernel 3.4.80 to see if that solved anything...

ok, so after three hours sat within range of the wifi, suddenly the phone has decide to connect to it (as I wrote the above post - maybe its feeling threatened! ). I wonder if this is going to be persistent behavior or wether it was a 1-off.

The Same Here

ElGzzar said:
The Same Here
Click to expand...
Click to collapse
Interestingly, my wifi seems ok now, but I'm still not getting any packet-data connection. After a recent phonecall I got the message 'No Sim or Sim Error' (although it let me make the call). Then I look at the details under 'About Phone' and 'Status' I get the IMEI number, it lists my phone number as unknown and Mobile Network State as Disconnected. Interestingly, it doesn't seem to be connected to the right network either. I wonder if the packet thing is actually and issue with reading the sim-card?

fix
How did you install the rom ??
I think restarting the phone after switching to 2g fixes the issue
it only happens on wrong recovery options (dirty flash)
use this "clean to install a new rom"
in http://forum.xda-developers.com/showthread.php?t=2557019

nschurch said:
Interestingly, my wifi seems ok now, but I'm still not getting any packet-data connection. After a recent phonecall I got the message 'No Sim or Sim Error' (although it let me make the call). Then I look at the details under 'About Phone' and 'Status' I get the IMEI number, it lists my phone number as unknown and Mobile Network State as Disconnected. Interestingly, it doesn't seem to be connected to the right network either. I wonder if the packet thing is actually and issue with reading the sim-card?
Click to expand...
Click to collapse
I think this issue from the kernel ..

arruted was
theonepharaoh said:
How did you install the rom ??
I think restarting the phone after switching to 2g fixes the issue
it only happens on wrong recovery options (dirty flash)
use this "clean to install a new rom"
in http://forum.xda-developers.com/showthread.php?t=2557019
Click to expand...
Click to collapse
I followed the instructions from this thread: http://forum.xda-developers.com/showthread.php?t=2588495 to install the rom. I used Odin 4.43 to install ancora.ops, then factory reset and cache wipe, then flashed the rom, then reboot (basically). I don't think there was anything wrong with the flashing process, it all seemed to go smoothly...
How do I 'switch to 2g'? do you mean select my preferred network as 2g?

OK, so I flashed the kernal to 3.4.80 and everything went smoothly. Wireless has been behaving (and was before the update), but I am still getting 'No Service' on my mobile connection. I tried setting my preferred network connection to 2G and that hasn't helped. I can probably live with it if wifi is working, but it is a bit annoying... I guess I could try the 'clean install' link.

Have this problem on DarkCM rom too

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?

Crashed mobile data ?

Hi
I have problems with my mobile data since yesterday. Im not what ive done, but right after emptying my trash (~2gb's) i lost my mobile data connection completely. I see signal, LTE 4G+ sign but all sites are unreachable. I did several things
- scanned phone for viruses and junk with Cleanb Master (nothing...)
- rebooted
- turned off and on
- rebooted into recovery (p2's based recovery, not twrp) and wiped cache.
- reseted my carrier settings, all, as well with APN name etc.
Nothing helps. Any ideas what may have happened ? I inserted this sim card into other phone and it works fine, there is mobile data connection active and working.
Is there some way to repair android ? Some repair tool, some mobile data package (extract from rom) to flash ? Im running 6.0.1 and at all cost i wanna avoid upgrading system to Nougat because of horrible battery life. I know what im talking about, i used to have N on P2 several months back. Never more!

Antaroo said:
Hi
I have problems with my mobile data since yesterday. Im not what ive done, but right after emptying my trash (~2gb's) i lost my mobile data connection completely. I see signal, LTE 4G+ sign but all sites are unreachable. I did several things
- scanned phone for viruses and junk with Cleanb Master (nothing...)
- rebooted
- turned off and on
- rebooted into recovery (p2's based recovery, not twrp) and wiped cache.
- reseted my carrier settings, all, as well with APN name etc.
Nothing helps. Any ideas what may have happened ? I inserted this sim card into other phone and it works fine, there is mobile data connection active and working.
Is there some way to repair android ? Some repair tool, some mobile data package (extract from rom) to flash ? Im running 6.0.1 and at all cost i wanna avoid upgrading system to Nougat because of horrible battery life. I know what im talking about, i used to have N on P2 several months back. Never more!
Click to expand...
Click to collapse
Try factory reset

Pixel 2 XL cellular data issue with any custom ROM

Recently i have entered some state in which mobile data is busted on my phone. I have tested multiple android pie roms to find the same thing in each. When i flash the latest stock android (PQ1A.181205.002), mobile data is fine. In this broken state i can see the signal bars with a little 'R' by them (notification on lost mobile data connection Data roaming is turned off. tap to turn on). Every time i navigate into Settings> Network & internet > Mobile Network > Advanced > Carrier Settings. The screen will flash and take me back to Mobile Network, this happens with every custom rom tested. The app SprintDM tries to set up the phone 5 times and then fails. Phone codes seem to have no effect. the code 4636 will allow me to view current info in which it says mobile data disconnected. It doesn't appear to matter if i connect to wifi and allow the basic stock apps to update first. Reboots do not help. I even tried flashing the modem and radio for PQ1A.181105.017.A1 and OPM4.171019.021.R1. I can also say the phone app shows a message "This device is not supported and phone calls may not work correctly". Phone calls work fine. Previously i was running LiquidRemix (10.0.2) just fine, everything working. Randomly mobile data died so i tried a update to LiquidRemix (10.0.3) and still busted. Tested multiple other PIE roms to find the same. And again if i flash any stock firmware mobile data is fine. Anyone else see this or have an idea of how to fix this for custom roms?

I rooted my pixel2xl yesterday and installed Havoc OS.
Today I was out with my family and was trying to navigate via Google maps and it continuously displayed error "try again"
Status bar was showing lte connection then I tried opening chrome and was unable to use mobile data even if it being on and active.
I am planning to move to Stock again tomorrow

vipulkarkar said:
I rooted my pixel2xl yesterday and installed Havoc OS.
Today I was out with my family and was trying to navigate via Google maps and it continuously displayed error "try again"
Status bar was showing lte connection then I tried opening chrome and was unable to use mobile data even if it being on and active.
I am planning to move to Stock again tomorrow
Click to expand...
Click to collapse
vipulkarkar, did you find out any other additional info on this? I went back to stock and everything is fine but would very much rather be running a custom rom.

Just seeing this post, fortunately, I've not run into this issue on stock or custom roms ... What I do run into, on stock or custom roms, is when I leave my house, with a T-Mobile CellSpot, I tend to switch to 3G or H+ in an LTE area. I sometimes have to cycle airport mode a couple times to get LTE back.. So odd and annoying!

Is there something we Sprint users could do to help the devs include Sprint connectivity in their roms? Like provide a nandroid backup of our device or ?

Question No Network Service after latest software update

Hello! I updated my phone to MIUI Global 13.0.7 Stable (SKHINXM) and suddenly my phone has no service. The sim card is fine and working on other phones like it was before the update. Really unable to fix this issue. If it helps, in the testing window the 'Mobile Radio Power' is toggled off and however many times I try to switch it on, it automatically switches off. Please help! Thanks

rishab298 said:
Hello! I updated my phone to MIUI Global 13.0.7 Stable (SKHINXM) and suddenly my phone has no service. The sim card is fine and working on other phones like it was before the update. Really unable to fix this issue. If it helps, in the testing window the 'Mobile Radio Power' is toggled off and however many times I try to switch it on, it automatically switches off. Please help! Thanks
Click to expand...
Click to collapse
13.0.7 Stable (SKHINXM) is a stable beta.
Try to reset the phone or if your bootloader is unlocked flash with this tool
https://forum.xda-developers.com/t/flash-tool-guide-use-xiaomi-flash-tool.4262425/

Will flashing the file lead to me losing all data? Apologies if it's a stupid question

rishab298 said:
Will flashing the file lead to me losing all data? Apologies if it's a stupid question
Click to expand...
Click to collapse
yeap ,use micloud, or Mi phone assistant or others to backup.(wifi).

NOSS8 said:
yeap ,use micloud, or Mi phone assistant or others to backup.(wifi).
Click to expand...
Click to collapse
Okay thank you! Will try it in a few days time once I am able to give it the time needed.

It is happening to me too, I'm on stock 13.0.4 SKHMIXM, bootloader locked, it happened in 13.0.3 too. Sometimes, I see I have no services, no data, no GPS. But WiFi works great, so if I'm in house I don't always see it, but it means I cannot receive call!!!
I tried to enable/disable sim/data/location/airplane/etc nothing works.
Only way to re-make it works is to reboot the phone, and after 2 or 3 weeks it will happen again, this is the price to pay to have cheap chinese phone...

Try booting into Android with Safe Mode. (and disable Airplane Mode if enabled)
Power + Volume Up > Safe Mode
Or try this:
Settings > Updater > Tap on the "13" several times, this will enable additional Updater-features. Download the latest package and install it.
My guess is that your update may have been corrupt.
Other than that.. Factory Reset or connecting phone to PC and flashing ROM using Fastboot & Mi Flash or Terminal.
I've 13.0.7 and everything's flawless.

So the Xiaomi service center told me that it is possibly a motherboard issue. How can a software update suddenly awaken a hardware issue?

So I had not unlocked my bootloader via my Mi account and it needs mobile data for the same and hence I am unable to flash it since my network is still unavailable even after a factory reset. Any other way I can flash my phone with an older version of MIUI or I will have to submit my phone to the service center?

rishab298 said:
So I had not unlocked my bootloader via my Mi account and it needs mobile data for the same and hence I am unable to flash it since my network is still unavailable even after a factory reset. Any other way I can flash my phone with an older version of MIUI or I will have to submit my phone to the service center?
Click to expand...
Click to collapse
I used Google phone to unlock the bootloader you don't need cellular service just change the account phone number to Google phone one to receive the code work ed for me

jefffrom said:
I used Google phone to unlock the bootloader you don't need cellular service just change the account phone number to Google phone one to receive the code work ed for me
Click to expand...
Click to collapse
Could you elaborate the whole process? I do not know how to do this. Thanks

Same issue i am facing after MIUI updation for 13.0.3.0 SJCINXM ... suddenly all networks are vanished ... if i do manual search for networks then i get a message 'Couldn't search for mobile networks' . Voice call is only possible if wifi is enabled.. This is really a horrible experience and i am unable to find out a way to get rid of this situation.. I am using Redmi 9 Prime handset .. Before this update everything was surperb and flawless.

It is still happening with the latest Android 13 and MIUI14, it's frustrating... sometimes when the phone switch wifi/lte/wifi/lte/etc when you go outside, the modem crashes, it internally bootloop and the phone becomes warm and can lose 25% battery in like 15 minutes. Only way is to reboot the phone.

I had a similar problem. Were you able to solve it?