Develop Bugs

Mobile data not working with Lollipop 5.0

Hello All,
I bought an LG G3 from Dubai couple of days before. It was working on Kitkat until I updated it to Lollipop 5.0 recently. Now, after the update, my mobile data is not at all working. I tried restarting the phone several times, switching between airplane mode and normal mode.
Has anybody faced the same problem with the recent update? How can I solve this problem?
Thank you

iam_amjath said:
Hello All,
I bought an LG G3 from Dubai couple of days before. It was working on Kitkat until I updated it to Lollipop 5.0 recently. Now, after the update, my mobile data is not at all working. I tried restarting the phone several times, switching between airplane mode and normal mode.
Has anybody faced the same problem with the recent update? How can I solve this problem?
Thank you
Click to expand...
Click to collapse
Did you try deleting the APN and reimporting the APN settings
I find that i have the same problem on my Australian G3 which is currently running v20F

itsbighead said:
Did you try deleting the APN and reimporting the APN settings
I find that i have the same problem on my Australian G3 which is currently running v20F
Click to expand...
Click to collapse
Wow...that immediately solved my problem. Thanks!!!

iam_amjath said:
Wow...that immediately solved my problem. Thanks!!!
Click to expand...
Click to collapse
My friend has LG G3 sprint and after updating to lollipop mobile data not working and there is no access point.
any suggestion?
Thanks

azozie said:
My friend has LG G3 sprint and after updating to lollipop mobile data not working and there is no access point.
any suggestion?
Thanks
Click to expand...
Click to collapse
You can request your network operator for the APN settings or you can add it yourself if you know it. I got mine delivered on my mobile after sending an SMS to the provided number by my network operator.
You can also Google for the APN settings. For example, 'sprint apn settings lg g3' since you mentioned it's on Sprint network. Then you can add those settings yourself by going to Settings->Networks->Tethering&Network->Mobile Networks->Access Point Names->New APN (on the top right)
Good luck. Thanks!

The problem is I can't find the access point its missing, and my network operator said the problem is with the phone
KITKAT was working pretty ok

LG G4 Wifi not working and MAC address not found

Hi,
Need help from devs. My LG G4 wifi was causing some connection problem yesterday.. blinking icon and dropping connection... but today wi-fi completely stopped working. MAC address also shows unavailable. I have tried factory reset twice with no result.
Is the phone gone for good here or is there a solution via rooting or such?

exactly same problem after yesterday update. H815, just yesterday (before update - google patch) worked fine. After update wifi icon start blinking and after 5 mins displayed message 'searching wifi network'. but nothing happens, it even unable to display networks list. all solutions at forum (clear data for apps) are not working. Thinking to go to lg service center.

Same here. Was working then updated the phone now blinking icon and no mac address. Updated the firmware via my pc but still no luck. Its totally stock h815 and no idea why the fff its wifi is now broke??? please someone help with this issue if you can.

anybody have found a solution? Or only way to go to LG service center?
My model is LG G4 H815/EU

afsafs said:
anybody have found a solution? Or only way to go to LG service center?
My model is LG G4 H815/EU
Click to expand...
Click to collapse
Same Problem Here!! Any solution?

Not sure what's going on with your connection issues, but the MAC address will only show when WiFi is on.

96cobra said:
Not sure what's going on with your connection issues, but the MAC address will only show when WiFi is on.
Click to expand...
Click to collapse
Yes the wifi dosent turn on

same here now my phone wifi cant be used...
hoping you can help me regarding this

rabz_82 said:
Hi,
Need help from devs. My LG G4 wifi was causing some connection problem yesterday.. blinking icon and dropping connection... but today wi-fi completely stopped working. MAC address also shows unavailable. I have tried factory reset twice with no result.
Is the phone gone for good here or is there a solution via rooting or such?
Click to expand...
Click to collapse
Hello, I got the same problem and I maybe found a solution !
Thats what I did on my LG G4:
- Turn the airplane mode ON
- Reboot the phone
- Turn the airplane mode OFF
- Go to wifi settings and if the wifi is not activated, turn it on
- If the bug persist at this point, do the process again

This happened to me on Sprint variant. Did a factory reset and never got passed the Google setup. Had to return the phone

Anybody ever find a solution to this problem? I have contacted LG repair service but I have heard nothing back from them. Not what I wanted to do as my bootloader is unlocked...

darrenjdoc said:
Anybody ever find a solution to this problem? I have contacted LG repair service but I have heard nothing back from them. Not what I wanted to do as my bootloader is unlocked...
Click to expand...
Click to collapse
Hello, have you
Tried resetting phone??
Tried rebooting router??

Yeah, flashed a stock 5.1 kdz to see if it would help but still the same. I had flashed a 6.0 rom and it was working for a day and then the problem started. Flashing back to stock 5.1 didn't help.

The phone is getting picked up tomorrow and will be fixed within 5 to 7 days according to the email from LG. I just hope they will fix it because of the unlocked bootloader...

same problem here. very disapointed to lg. i heard that this is harware problem.
wifi icon keeps blinking. no warranty at all. bought in korea.

AymericM said:
Hello, I got the same problem and I maybe found a solution !
Thats what I did on my LG G4:
- Turn the airplane mode ON
- Reboot the phone
- Turn the airplane mode OFF
- Go to wifi settings and if the wifi is not activated, turn it on
- If the bug persist at this point, do the process again
Click to expand...
Click to collapse
Just wanted to thank you for this. Ive had this same damn problem for 2 days and this worked as a workaround. This was the second time the bug surfaced, the first time resolved itself after a day and a system update that was pushed to my phone right before the bug started. It was already downloaded so i just installed it and the bug went away. A week later the bug surfaces again and Im pissed off ready to take my phone in and i stumble on this. IT WORKED! Thanks again.

AymericM said:
Hello, I got the same problem and I maybe found a solution !
Thats what I did on my LG G4:
- Turn the airplane mode ON
- Reboot the phone
- Turn the airplane mode OFF
- Go to wifi settings and if the wifi is not activated, turn it on
- If the bug persist at this point, do the process again
Click to expand...
Click to collapse
I got this to work on my Wife's G4 when it was having the flashing WiFi issue, well, sort of. In addition to switching airplane mode on I had to toggle bluetooth and NFC, then all the sudden WiFi connected and stayed that way. I then rebooted and turned airplane mode off and everything seems to be ok now.

I have the same problem after updating my LG G4 to 6.0. The wifi is flashing and mac is bogus: 02:00:00:00:00:00. Bluetooth is also unavailable.
I contacted LG support and they told me to factory reset the phone. This did not make a difference.
Any updates on how to fix this?

AymericM said:
Hello, I got the same problem and I maybe found a solution !
Thats what I did on my LG G4:
- Turn the airplane mode ON
- Reboot the phone
- Turn the airplane mode OFF
- Go to wifi settings and if the wifi is not activated, turn it on
- If the bug persist at this point, do the process again
Click to expand...
Click to collapse
Thanks AymericM!!!!! This was driving me mad, and your strange tip worked, i can´t believe it!!

Rebooting is just a temp solution and doesn't always work.
No dev here have any permanent solution?
---------- Post added at 01:37 PM ---------- Previous post was at 01:14 PM ----------
Activate Developer options - tap Build No in About a few times
then in Developer Options - >> User legacy DHCP client
Reboot and try to connect

No Wi-Fi, no Bluetooth and no FM Radio [D855]

I'll try to give as much information as possible.
Yesterday I was surfing the internet and suddenly my phone froze and randomly restarted. After that I wasn't able to connect to wifi nor bluetooth. I was running android 6.0 with 30B modem, rooted and with TWRP. After that I flashed Modem from v21C Firmware. I don't know if doing such was responsible for the next thing, but my Wi-fi mac adress and bluetooth adress disappeared from Hardware information. Note that my IMEI information did not disappear.
After that I did a full factory reset with .TOT method. That didn't solve my problem. Tried upgrading to lollipop, did not work. I've done like 10 factory resets only today, I've tried to fix persist partition following this guide http://forum.xda-developers.com/google-nexus-5/general/guide-to-fix-persist-partition-t2821576, same results.
In 4.4.2 and 5.0(all versions I tried from lollipop), both wi-fi and bluetooth adresses showed up as anavailable. Sometimes after rebooting, my phone would connect to wi-fi and show my mac adress, and would crash after 30 seconds..
On 6.0,my mac-adress shows as 02:00:00:00:00:00 and bluetooth adress as unavailable.. Need some serious help here, tried so much stuff nothing worked..
I'll attach some screenshots that may be useful
Any questions and any tries to help me are highly welcome.
Enjoy 6.0 on your phones and thanks for reading :fingers-crossed:
-------------------------
Edit:
Adding some logs. Half a year passed, no solutions.
1 out of 100 reboots wifi works. I've gathered some logs of 1 of the moments wifi works. Hoping someone can figure something out. Tried lots of roms, nothing seems to work.

Forgot mentioning that both wifi and bluetooth show as trying to connect on notification bar, but when I go to settings and press on them, both say "turning on (wifi or bluetooth)" when the button is grayed out and off..

did you tried to use the cse flash in flashtool to fix this?

Broloff said:
did you tried to use the cse flash in flashtool to fix this?
Click to expand...
Click to collapse
Did CSE flash, normal flash, TOT factory reset, wiping wifi's definitions.. Nothing seems to work :crying:

More info:
During the night, I removed the battery from the phone and booted my phone. After that Bluetooth would work, and Bluetooth adress would show up on "Hardware informations". Then, I turned off bluetooth and tried to put it back on. Bluetooth adress disappeared and my bluetooth would not turn on. Hope anyone helps..

How about your imei?
Enviado de meu ASUS_T00F usando Tapatalk

if you have a backup try to restore modem, efs and efs2

Aquati said:
How about your imei?
Enviado de meu ASUS_T00F usando Tapatalk
Click to expand...
Click to collapse
My imei shows up both on about phone and *#06#
mahmoud yasser said:
if you have a backup try to restore modem, efs and efs2
Click to expand...
Click to collapse
I have an old twrp backup from boot and system partitions, do those contain them?

@myclarity while in twrp choose restore and check if your backup contain them
check this http://forum.xda-developers.com/lg-g3/development/efs-lg-g3-efs-backup-restore-t2907329

myclarity said:
I'll try to give as much information as possible.
Yesterday I was surfing the internet and suddenly my phone froze and randomly restarted. After that I wasn't able to connect to wifi nor bluetooth. I was running android 6.0 with 30B modem, rooted and with TWRP. After that I flashed Modem from v21C Firmware. I don't know if doing such was responsible for the next thing, but my Wi-fi mac adress and bluetooth adress disappeared from Hardware information. Note that my IMEI information did not disappear.
After that I did a full factory reset with .TOT method. That didn't solve my problem. Tried upgrading to lollipop, did not work. I've done like 10 factory resets only today, I've tried to fix persist partition following this guide http://forum.xda-developers.com/google-nexus-5/general/guide-to-fix-persist-partition-t2821576, same results.
In 4.4.2 and 5.0(all versions I tried from lollipop), both wi-fi and bluetooth adresses showed up as anavailable. Sometimes after rebooting, my phone would connect to wi-fi and show my mac adress, and would crash after 30 seconds..
On 6.0,my mac-adress shows as 02:00:00:00:00:00 and bluetooth adress as unavailable.. Need some serious help here, tried so much stuff nothing worked..
I'll attach some screenshots that may be useful
Also, forgot to say that, if I try to turn on wi-fi, if I connect my phone to my computer, computer will recognize I attached something and will start charging the phone, but I won't be able to transfer items to my phone since it won't appear anywhere on my pc..
Any questions and any tries to help me are highly welcome.
Enjoy 6.0 on your phones and thanks for reading :fingers-crossed:
Click to expand...
Click to collapse
Same situation here. Only 6.0 shows 02:00:00:00:00:00. Try everything, like you
I have more than 20 twrp backup with efs, modem etc, nothing work. I also can't boot from cm13.
Waiting for a solution

gmbengue said:
Same situation here. Only 6.0 shows 02:00:00:00:00:00. Try everything, like you
I have more than 20 twrp backup with efs, modem etc, nothing work. I also can't boot from cm13.
Waiting for a solution
Click to expand...
Click to collapse
I think I found a solution but I can't test it since I'm having problems connecting my phone to my PC ( another problem appeared..)
May I ask yo to install busybox and try this on adb?
adb shell
su
busybox iplink show wlan0
and see if it shows your real adress, if it does
busybox ifconfig wlan0 hw ether (adress)
busybox iplink show wlan0

myclarity said:
I think I found a solution but I can't test it since I'm having problems connecting my phone to my PC ( another problem appeared..)
May I ask yo to install busybox and try this on adb?
adb shell
su
busybox iplink show wlan0
and see if it shows your real adress, if it does
busybox ifconfig wlan0 hw ether (adress)
busybox iplink show wlan0
Click to expand...
Click to collapse
Ok I'm at work. i'll try it at home
edit :
finaly don't work (iplink: can't find device 'wlan')
I'll try with marshmallow, I'm on lollipop

gmbengue said:
Ok I'm at work. i'll try it at home
edit :
finaly don't work (iplink: can't find device 'wlan')
I'll try with marshmallow, I'm on lollipop
Click to expand...
Click to collapse
I don't have my phone with me, sent it to repairing. Any news?

I'm having a very similar issue. Wifi and bluetooth won't turn on and cycle. On some reboots, Wifi will turn on but the phone will shut down shortly thereafter. I've tries several different ROM's and can fix the Wifi, but no the power not the shutting down.

jboch9510 said:
I'm having a very similar issue. Wifi and bluetooth won't turn on and cycle. On some reboots, Wifi will turn on but the phone will shut down shortly thereafter. I've tries several different ROM's and can fix the Wifi, but no the power not the shutting down.
Click to expand...
Click to collapse
I'm having the exact same problem but a bit worst. I can't even turn my phone on. Phone came back from repairing, guy couldn't fix it. Tried some rom's, many "fixes" from the internet, nothing. Seems like the only way to solve this will be by hardware..

exactly same problem with my g3 too
even i was using stock 30b firmware and after one week of usage it suddenly crashed and stuck in bootloop hence downgraded to lollipop and tried all roms,factory reset,different modems etc but still not fixed
waiting badly for an solution

I'm having pretty much the same problem, along with overheating and screen fading. I'm using stock Lollipop, never rooted. I've tried a factory reset and a new battery with no results.

Any solutions?

Guys I've sent my phone to a local repair shop and they said they took it to LG's official partner.. I've been waiting for a while and it doesn't look good.. A friend of mine bought a g3 recently. I suspect this problem comes from a corrupted or missing file. I'll ask him to help me on checking files if the local shop can't find a way to fix the phone. If everything fails, the only possible solution I see is a new main board or a new phone..

lg g3
myclarity said:
Guys I've sent my phone to a local repair shop and they said they took it to LG's official partner.. I've been waiting for a while and it doesn't look good.. A friend of mine bought a g3 recently. I suspect this problem comes from a corrupted or missing file. I'll ask him to help me on checking files if the local shop can't find a way to fix the phone. If everything fails, the only possible solution I see is a new main board or a new phone..
Click to expand...
Click to collapse
what is the exact problem ur facing in ur phone.

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?

I can't fine my WiFi but still see all other WiFi networks!

My friend bought a LG G3 yesterday and it was working 100% , but today he can't see his router's WiFi.
We tried to reset the router settings and set it all again , but still the same problem.
He can see all other Wireless networks but not his network.
My brother have another LG G3 and he can see the WiFi network but his friend's G3 can't.
What is the problem? how to fix it?

I have seen many g3 having wifi issue which is hardware issue almost every time but u can try first going into service menu explore the menu till u find wifi change the settings see if it helps if not factory reset first complete wipe the phone if it still persists then flash stock rom via lgup or lg flash tool 2014