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

Intermittent data connection

My phone started turning on and off its 3g connection. Wifi works solid.
I'm on a good signal area. It's not like the 3g is on and I can't connect in anything.
The problem is that the phone turns on and off. It doesnt fix the 3g connection.
Also, Checkin service it's draining the battery a lot.
Looks like a software problem with Google Play Services and its Connection checking service.
Anybody have seen this problem?
thanks in advance.

Starting to worry right now. Did a factory reset on a flashed V10j KDZ and it didn't change.
TWRPed a 20A Lollipop rooted ZIP and it didn't change. Right now I'm trying to go back stock using LG PC Suite.
I can't understand why this can be a hardware problem because 3G actually works but it keeps constantly getting on/off in ~10 seconds intervals.
Looks like a bad system file that is messing with it.
EDIT: Also, the phone can't search for mobile networks anymore. I just tell it to do a manual search and it can't find anything.
What would this be? Modem file broke? WTH.

alfablac said:
Starting to worry right now. Did a factory reset on a flashed V10j KDZ and it didn't change.
TWRPed a 20A Lollipop rooted ZIP and it didn't change. Right now I'm trying to go back stock using LG PC Suite.
I can't understand why this can be a hardware problem because 3G actually works but it keeps constantly getting on/off in ~10 seconds intervals.
Looks like a bad system file that is messing with it.
EDIT: Also, the phone can't search for mobile networks anymore. I just tell it to do a manual search and it can't find anything.
What would this be? Modem file broke? WTH.
Click to expand...
Click to collapse
I have random disconnects/drops too, Although my 3G/LTE icon never actually goes away, just the signal.
Personally I would suspect your modem as #1 suspect.
Factory reset rarely fixes much, I would try re-flashing the phone.
If KDZ flash doesn't fix it maybe try a tot & dll flash using LG Flash Tools with modified megalock.
It definitely looks like a modem issue BUT it can be a your os. I had issues where my modem wouldn't flash from a stock flash on my S4, But manually flashing my modem would SOMETIMES work, I would have to flash the modem a few times usually before it would actually flash.

I had problems before but it was caused by network. Did you tried with different SIM card from other network?

I have the same problem and couldn´t fix yet... Didn´t try to use another SIM card to check if is a network trouble, but it´s driving me crazy to be without connection and a huge battery draining...
Any other ideas?

viniciuscordeiro said:
I have the same problem and couldn´t fix yet... Didn´t try to use another SIM card to check if is a network trouble, but it´s driving me crazy to be without connection and a huge battery draining...
Any other ideas?
Click to expand...
Click to collapse
Just try with other network SIM. I had same problem long time back with Nokia n96, Motorola defy and some other phones. Some of time it helped to set phone only to use 2g network. That was happening the most of time when i used VIP network in Serbia.
Setting only 2g signal helped sometimes but after changing SIM card, problem was solved.
This problem happen to me without reason and after some time i tried same network again, there was no problems.

Probably a different SIM will correct the problem, because after a lot of trial and error changes I realized that the current Network APN (you can reach going on Mobile Networks inside Connections and Networks [translation] in the Settings) was faulty. I deleted the APNs and made a restore. (Delete and Restore are the only options inside Network APNs).
I imagine that changing SIM cards from another carrier will reconfigure the APNs and probably fix the problem.

I´ve tried a different SIM card and didn´t found any troubles, but when I put mine, the problem come back again... So it´s a problem with my carrier. I´ve deleted the APN settings, restart, restore, restart again and didn´t solve. I´ll call them to check if they are experiencing any network issues.

GT-I9192 No service

Hi, I'm having some troubles here with a GT-9192 (Stock ROM 4.2.2), one of my friends brough me his phone which he tried to root (I don't know how or what software did he use to do so) and I think he did something really wrong because now the phone boots as normal but doesn't get any network signal at all. SIM1 doesn't recognize any SIM inserted, SIM2 does but there's no service at all, every time I try to search for a network provider it fails and if I select automatic selection it says "registered on network" but there's no signal at all.
I tried flashing today Bliss 6.0.1 ROM and it flashed nice, booted up and worked as intended yet the device has no network signal. WiFi and bluetooth work nicely.
What can we do to fix this? I did a Nandroid backup of the official Stock ROM on TWRP 3.0.2-1 and I just did a restore. Do you need more info? I'm out of ideas.

No signal, no wifi, no gps

Hello you guys!
I just received my lg g7 g710ulm. And when i turned on the phone i understood that im not lucky.. I need your helps! Please! Because i cant do it myself.
1. No signal. Don't search networks. Immediately getting error when trying to do it myself. "Preferred network mode" can't change due error and it showed "null". After reflashing it's now showing "22".
2. Don't see any wifi networks. But access point is working and other devices can see me.
2.1 I found that wifi going to work then i tried to use gps. After few seconds phone starting see wifi networks and connecting. If turn off wifi and turn on again phone don't see networks and you need to repeat procedure.
3. Looks like gps not working too.. But tried only in indoor.
I can't understand is it software or hardware issue. Maybe seller changed imei number and model by firmware and did it wrong? Antutu showing strange imei.
Can i to know somehow real model of phone? I can try to make logs and attached it here. Or maybe somebode can check imei, bands with octopus box? I dont know what to do
P.S. Bluetooth is working. Tried to send file and it was fine.
I can't return phone to shop because im living in different country But phone is amazing! And I loved lg. I had lg optimus one (was lost and back by good people), then lg optimus black(was burned in bonfire), lg g2(left in taxi), lg g6 (was lost) and finally lg g7. Yeah, looks like something wrong with me or these lg.. But i love it

Did you put in your SIM card first before you started...
I read you need to insert sim first but could be wrong.

sas007 said:
Did you put in your SIM card first before you started...
I read you need to insert sim first but could be wrong.
Click to expand...
Click to collapse
Sure, i did it. Anyway don't search networks. But what carrier of sim card and numbers into sim card, phone can recognise.
Maybe i wrote not understandable? My english not first language. So asking. I will try to explain.
Thanks for your reply.
I uploaded a log file with errors but cant to write here link, because i need 10 messages

My G710ULM's GPS stopped working 2 days ago, still trying to find out what's the cause of it. Tried apps like GPS Status, GPS Locker, no avail that it isn't picking any satellites at all. Just searching for GPS location. Restarting the device haven't helped either. In settings I even excluded all apps in Power Saving Exclusions. In GPS Status app, resetted and downloaded the A-GPS, this should surely make the GPS work. No success.

deonin said:
Hello you guys!
I just received my lg g7 g710ulm. And when i turned on the phone i understood that im not lucky.. I need your helps! Please! Because i cant do it myself.
1. No signal. Don't search networks. Immediately getting error when trying to do it myself. "Preferred network mode" can't change due error and it showed "null". After reflashing it's now showing "22".
2. Don't see any wifi networks. But access point is working and other devices can see me.
2.1 I found that wifi going to work then i tried to use gps. After few seconds phone starting see wifi networks and connecting. If turn off wifi and turn on again phone don't see networks and you need to repeat procedure.
3. Looks like gps not working too.. But tried only in indoor.
I can't understand is it software or hardware issue. Maybe seller changed imei number and model by firmware and did it wrong? Antutu showing strange imei.
Can i to know somehow real model of phone? I can try to make logs and attached it here. Or maybe somebode can check imei, bands with octopus box? I dont know what to do
P.S. Bluetooth is working. Tried to send file and it was fine.
I can't return phone to shop because im living in different country But phone is amazing! And I loved lg. I had lg optimus one (was lost and back by good people), then lg optimus black(was burned in bonfire), lg g2(left in taxi), lg g6 (was lost) and finally lg g7. Yeah, looks like something wrong with me or these lg.. But i love it
Click to expand...
Click to collapse
I can fix it. Send me a PM.

Resolution?
Hi in having the same issues with my G7 thinq... I was wondering if you guys found a resolution for this issue?

5centr5 said:
I can fix it. Send me a PM.
Click to expand...
Click to collapse
Hello expert. I have an LG G7 ThinQ ULM phone. The problem of this phone is no phone waves signal, 3G, 4G. (a week ago that is good). I think that because the SIM and insert this SIM into other phones, this SIM still works very well. So can you show me how to fix it? Thank you very much!
Note: I was try as below but not success
Go to the Home screen;
Tap on the Phone app;
Switch to the Dial pad;
Type in (*#*#4636#*#*) and just wait – the phone should automatically redirect you to the Service mode;
Once you’ve entered this new mode, tap on Phone Information or Device Information;
Tap on Run Ping test;
Look for the button labeled as Turn Radio Off and select it;
Wait for the phone to restart;
Tap on reboot.

Problem on LG G710ULM OF WIFI, GPRS, SIM CARD READING
Hello i have the same problem on my LG G7 i buyed this motherboard but just problem again . please if you find a way to fix this. someone tell me how to do it :highfive:

hello i have the same problem. no wifi, no network.. enable radio in service menu not resolved problem... any solution??

Solution? I have the same problem

I can fix it with TV for little bucks.

got the same problem after trying to update

I've got the same problem after flashing the android 10 update. Tried android pie and oreo but nothing helped. I will really appreciate any help as this is my daily driver.

my imei wifi mac still exist and working but the problem still persist
update:
finally got my network working all you need is an original qcn backup or flash original modem_a,b partition with QFIL if imei shows null use this tutorial to change ur origin imei/MEID, im not gonna give full tutor or the file since no one answered me, good luck.

kunarbale said:
my imei wifi mac still exist and working but the problem still persist
update:
finally got my network working all you need is an original qcn backup or flash original modem_a,b partition with QFIL if imei shows null use this tutorial to change ur origin imei/MEID, im not gonna give full tutor or the file since no one answered me, good luck.
Click to expand...
Click to collapse
hi, i need help, same mistake, i dont get a solution

Hi guys, I bring a solution to this problem, I found this topic: https://forum.xda-developers.com/t/no-signal-after-crossflashing.4089281/, you understood better by reading yourselves, but basically I flashed the rom with lg up chip erase mode and my wifi/data started working again, I know this is not recommended under any circumstances but it worked for me.

However, be aware that ChipErase mode not only erases IMEI numbers, but also erases MAC addresses, EFS partition and others. In many countries if your device does not have an IMEI number or other identifiers, SIM networks cannot allow (my case in Brazil it worked) for you to register with them, i.e. in most cases your sim will not work on the phone and you will not have cell service. You may still have issues with WiFi networks as without MAC addresses your WiFi will be grayed out or the network may not allow you to connect. Also, be aware that in many countries around the world knowingly tampering with or changing your phone's IMEI numbers is against the law. IMEI number is how networks and ultimately law enforcement identify the device and its owner

kunarbale said:
my imei wifi mac still exist and working but the problem still persist
update:
finally got my network working all you need is an original qcn backup or flash original modem_a,b partition with QFIL if imei shows null use this tutorial to change ur origin imei/MEID, im not gonna give full tutor or the file since no one answered me, good luck.
Click to expand...
Click to collapse
hi can i use this method to fix my wifi problem? my wifi cant be turn on at all after so many change of roms, it does work on every firmware i used. i need a help

[SOLVED] Keep losing mobile service

I'm gonna lose my mind.
Last week I did a factory reset. Everything was great for a few days. Then as of Monday, my phone no longer connected to mobile network. (I'm on Visible, which is a Verizon MVNO.)
I tried the same SIM card in another phone, and it worked — but a different SIM card did not work in my phone. So it must be the phone, right?
I looked at About phone > SIM card status:
Network: Visible
Mobile network state: Disconnected
Service state: In service
IMS reg status: Registered
Signal strength: -113 dbm
Network Cell Info Lite app showed the nearest tower and:
SIM state: Ready
Service state: In-Service
I tried resetting network settings and restarting in safe mode, but that didn't help. Visible said to take the phone in to Samsung repair center.
So I did that. They ran a diagnostic, and said everything was fine. They said try factory reset again.
So I factory reset the phone, again, from recovery mode, wiping with cache several times.
After, service was working. Yay!
But then a few hours later, the battery died, and ipon powering back up, I AGAIN no longer have cell service!
Could it be related to adding a work profile? Enabling dev mode?
Any bloody idea what is happening??
I'm loathe to do another factory reset, as it takes me half a day to set up everything again (Work profile authentication, etc.)
Please help save my sanity.
Thanks!

Same problem.. note 10 plus n976b , after flashing stock ROM SIM goes to emergency calls only, now I am on Dr Ketan's ROM but still same problem persists...

Malik Sayriii said:
Same problem.. note 10 plus n976b , after flashing stock ROM SIM goes to emergency calls only, now I am on Dr Ketan's ROM but still same problem persists...
Click to expand...
Click to collapse
I'm not even rooted. Stock rom.

Anyone??

d0g said:
Anyone??
Click to expand...
Click to collapse
Try playing about with this app, it allows you to force the phone to connect to specific network bands, possible you could force it to reconnect when it drops out
Samsung Band Selection - Apps on Google Play
This app will help you access hidden network settings for forcing band selection
play.google.com

SOLVED!
I popped in a SIM from a different carrier, causing phone to restart, then put back the Visible SIM, forcing phone to re-retrieve settings.
Whew!

Couldve been a CSC issue?

d0g said:
SOLVED!
I popped in a SIM from a different carrier, causing phone to restart, then put back the Visible SIM, forcing phone to re-retrieve settings.
Whew!
Click to expand...
Click to collapse
Congrats to you, but my problem didn't solved yet...
@*Detection* i have tried this app many times but didn't worked for me... maybe i have lost my IMEI & device is just showing dummy IMEI though IMEI is same after & before flashing the ROM but when i flashed the IMEI went to NULL in settings then after applying essential fix IMEI came back it also detect the sim but not picking the cellular network only showing the name of network...