H815 Network issue - G4 Q&A, Help & Troubleshooting

hey i was trying different roms and finally at end I decided to flash stock back, when i started my phone using stock os LP/MM both i have strange network issue. its like its connecting to network for few second then no service and keep repeating this stuff. flash different modem, cleaned board connectors but still same problem goes on. use different KDZ and custom rom but i cant resolve the issue. if anybody know anything or have any solution or suggestion will appreciated.
Issue - drop network after every 10-12 second and keeps repeating.

I Have the same issue.Its driving me nuts :silly:

I have the same problem..help please

Can you send me your suffix code and hardware rev. Number . I found one solution which is partially working for now. I can manage to get network but of I turn on my phone while keeping wifi on then network will react strange but if I turn on my phone while keeping only data on then it wouldnt happen it remain solid. I recently posted about this in bootloader unlock thread and then few people started making fun of mine (they dont know why there is caution word when you unlock the bootloader) duffer. . But i know its causing because of bootloader unlock.

Related

No Service Selected network (AT&T) unavailable! No Signal

I flashed in JB AOKP was working fine all of last night. I also entered my SIM Pin or unlock code. The first time I put in an 8 digit unlock code I have. Second time it prompted me I skipped it. I'm pretty sure it was the security pin and not the network unlock. I don't have any other phone's micro SIM I can insert into my phone and a local phone store's T Mobile SIM produced no different of a result except for replacing AT&T with T-Mobile (I have not however put my microSIM into another phone...because I don't have another micro sim phone). Reboot phone this morning and it's no longer working. Tried to enable 2g. Nothing. Tried a battery pull with the phone on, pulling the SIM (same message with SIM pulled out),
Wifi works
This sucks big time ;(
Note: I am pretty sure I did not network lock the phone or anything because the SIM prompt that came up when I flashed JB did not ask me for my unlock or network code (I would have known). The first time I entered that code was 'just in case it's asking me to unlock" but why would it ask me a second time then? So I doubt it was prompting me for a network unlock code. The prompt from youtube videos was different too.
Also APN is empty, but I think that's becasue I'm not connected to any network
Pressing Available networks brings up AT&T AT&T AT&T T-Mobile T-Mobile "311660" pressing any of them you get a quick window connect "too fast" goes back to/stays in available networks screen and says "Can't connect to this network right now. Try again later."
So I added the AOKP and Corresponding kernel yesterday and I mean it was working fine with 4g... apparently this thread says that you need to flash a new radio in some cases when you change kernels?
http://miuiandroid.com/community/threads/no-service-galaxy-s.6529/page-2
zetsui said:
I flashed in JB AOKP was working fine all of last night. I also entered my SIM Pin or unlock code. The first time I put in an 8 digit unlock code I have. Second time it prompted me I skipped it. I'm pretty sure it was the security pin and not the network unlock. I don't have any other phone's micro SIM I can insert into my phone and a local phone store's T Mobile SIM produced no different of a result except for replacing AT&T with T-Mobile (I have not however put my microSIM into another phone...because I don't have another micro sim phone). Reboot phone this morning and it's no longer working. Tried to enable 2g. Nothing. Tried a battery pull with the phone on, pulling the SIM (same message with SIM pulled out),
Wifi works
This sucks big time ;(
Note: I am pretty sure I did not network lock the phone or anything because the SIM prompt that came up when I flashed JB did not ask me for my unlock or network code (I would have known). The first time I entered that code was 'just in case it's asking me to unlock" but why would it ask me a second time then? So I doubt it was prompting me for a network unlock code. The prompt from youtube videos was different too.
Also APN is empty, but I think that's becasue I'm not connected to any network
Pressing Available networks brings up AT&T AT&T AT&T T-Mobile T-Mobile "311660" pressing any of them you get a quick window connect "too fast" goes back to/stays in available networks screen and says "Can't connect to this network right now. Try again later."
Click to expand...
Click to collapse
Pardon my newbness if I'm way off base, but lost IMEI? sounds like the same symptoms I was getting a couple days ago when I flashed CM10.
Kostazu said:
Pardon my newbness if I'm way off base, but lost IMEI? sounds like the same symptoms I was getting a couple days ago when I flashed CM10.
Click to expand...
Click to collapse
...what are you talking about. My IMEI isn't mentioned once in that post. In fact now that you mention it, since people's IMEI changed...nothing like that my phone still has its IMEI
I also did not get a "phone frozen" from entering the wrong code too many times...so I doubt its locked like that. There was a random reboot that I WOKE UP to, but nothing weird...it rebooted randomly but worked finely after that
zetsui said:
...what are you talking about. My IMEI isn't mentioned once in that post. In fact now that you mention it, since people's IMEI changed...nothing like that my phone still has its IMEI
I also did not get a "phone frozen" from entering the wrong code too many times...so I doubt its locked like that. There was a random reboot that I WOKE UP to, but nothing weird...it rebooted randomly but worked finely after that
Click to expand...
Click to collapse
I was proposing the theory that you may have lost your IMEI, since the symptoms you report were very similar to what I was experiencing when I lost mine, however since you still have yours, must be something else, eh?
Kostazu said:
I was proposing the theory that you may have lost your IMEI, since the symptoms you report were very similar to what I was experiencing when I lost mine, however since you still have yours, must be something else, eh?
Click to expand...
Click to collapse
Just flashed an old version of the same rom...still nothing, although this version had 4g lte working for sure gonna try one more flash of the same rom with only some system settings moved around.. I actually need this phone to travel to Europe ;( ffs worst time
Kostazu what was the fix for you?
Ok just flashed Nostalgia which is the stock rom minus bloatware and I get No SIM Insert SIM card (it is in) and when I try to make a call "not registered on network"
zetsui said:
Just flashed an old version of the same rom...still nothing, although this version had 4g lte working for sure gonna try one more flash of the same rom with only some system settings moved around.. I actually need this phone to travel to Europe ;( ffs worst time
Kostazu what was the fix for you?
Click to expand...
Click to collapse
Well, mine was definitely due to a lost imei that happened sometime when flashing.
I did get the network unlock warning thingy twice, and then had no cellular connectivity, which is why I mentioned the lost imei. I restored my nandroid back to stock, then used the method here with a little driver tapdancing to reinject my imei, and that solved my issues, but sounds like you have something else going on.
http://forum.xda-developers.com/showthread.php?t=1801997
If I flash back to stock and no longer have the stock kernel, what is the steps for flashing back then?
1. flash stock kernel
2 fix partitions
3. factory rest/cache/davlik
reboot into oden and flash new image?
Long story short, Don't cut your own microsd..the sim pins on this phone are VERY sensitive and hard to fix/see. Don't bend em.
I am having the same problems right now, I keep on getting " NO SERVICE" - SELECTED NETWORK UNAVAILABLE" Error.
Rebooting doesnt help, flashing modem through CWM doesnt help. I know for a fact that the simcard it good because other apps that I install can read the sim with no problem, and my WIFI is working like a charm.
Someone got a solution for this? This is already like 4 days ongoing, please any help will be appreciated !!
Im having the same no service selected network issue. I can search and find att and the mobile but when I try to have it connect to att that's the error I get. I have an att SIM card in the phone. Sph l720 SIM unlocked, it didn't ask me for an unlock code or anything like that but I also don't get the invalid SIM card error. I've added the main apn from the att website but that doesn't help and the phone is current set to gsm/umts. If anyone has a fix please let me know, thank you.

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.

Airplane mode on, network problem ZUK Z2

Hello, I'm having problem with my zuk z2. I've had phone for more than a month and it worked fine. I flashed mokee rom and was working excellent. After one update it couldn't connect to network and phone was stuck in airplane mode. It's not showing that airplane mode is on, only when I press power button it says it's on, but nothing happend when pressed. It detects both sim cards but can't get registered on network. Also in secret menu (*#*#4636#*#*) shows Radio off and can't turn it on, or change anything in that menu. I changed a lot of custom and stock roms, with locked and unlocked bootloader, nothing solved the problem. When flash fresh rom it has network (not after every flash), but after some times it just gets disconnected. Please, help me. If someone have solved this problem or have any idea what problem could be.
Edit: I found out that my sim slots IMEI change places, IMEI1 goes to slot 2.
i got the same problem
Same problem here with offician Indian ZUI
damn.. i thought this happened only with china rom.
didn't know it got same issue here.
Same problem
Same problem here. 2.0.133 ST official indian ROM. Any news about this problem?
I have the same issue running Slim 6 on zuk z2
i installed mokee os and the signal comeback again but actually not worked
Yes, I also installed mokee nightly 4/22 and its been working great. Signal is back
me too
Same problem Here.... bought on banggood and after one month network signal disappeared. Today I've unlocked the bootloader and installed Mokee stable ( 13-4-2017) and Lineage 14.1 of 16-01-2017 .... nothing! Still not working.
I suppose it is a failed lot from ZUK delivered from banggood/gearbest/ali ...
I've just wrote an email to zuk support in order to complain about it ...
Yes, because, right now I cannot send back in china at my expenses the equipment and pay for a substitution with another defective terminal.
I've just asked them hoto behave....
I suppose we need to start a class action like the one against samsung for S7 note
However, I'm very disappointed, 1 month and it was looking like a wonderful terminal ...fooooook.
Same problem here. Anybody please share the QCN backup (or valid link to download this) to try repair QCN and IMEIS ?
Same problem here:
I tested different roms and different baseband-versions still no network.
Edit: I also tried flashing it via an external tool - still does not work
http://www.androidbrick.com/zuk-z2-z2-pro-qpst-qfil-miflash-rom-flashing-guide/
I install the Z2plus_MIUI8_6.12.1_zukkati.zip ROM and recover the radios. I feel good!!!!!
Then I installed 2.5.334ST via Qfil, installed TWRP and install other ROMs and everything works fine.
Any Luck guys? Please help if anyone manage to resolve this issue.
Thank you!
Same with me
I had this problem also one month ago, bricked the phone and endly I could it get working again with lingeage on it. Was working perfect.
Today the problem is there again.
When I start the phone without the simcard airplane mode is off (when I touched the power button) with the simcard in the phone it starts with airplane mode on.
Is there a possibility to disable airplane mode complete?
Anyone any idea?
This problem has been around for ages, and no apparent solution to it. Sent it back to warranty and it got flashed frm Custom ROM and back to stock ROM with same results. Useless. Dead.
Got a partial refund instead .
Guys there is any solution?? I have this problem with my Zuk Z2.. Plz help me
Problem Solved
I also had same problem tried all methods described here and in zukfans.eu, but failed. At last discharging(shorting) some capacitor related to network IC did the job.
murtoz said:
I also had same problem tried all methods described here and in zukfans.eu, but failed. At last discharging(shorting) some capacitor related to network IC did the job.
Click to expand...
Click to collapse
hey, could you provide some more info? is it hard?
Same problem
I got the same problem, could someone help me with repairing this? Flashing roms didn't help
Could you say more information about discharging capacitor? Is it possible to do in home?

Mi Max not showing sim signal No Service

Hi guys,
I've got a Mi Max 64gb, it was working ok and then it auto updated to MIUI 9 and now i get no signal. If I go into setting, it will show my sim name (three) but thats it. It has no signal and I thus can not make or take calls. The status bar at the top says no service.
I purchased the phone second hand and everything was working fine so did a blacklist check just in case and both IMEI come back clear. Also when I switch from fin network automatically to manual, it will find a few networks but will no connect.
Anyone know what can be wrong? Phone has locked bootloader fyi.
waqas321 said:
Hi guys,
I've got a Mi Max 64gb, it was working ok and then it auto updated to MIUI 9 and now i get no signal. If I go into setting, it will show my sim name (three) but thats it. It has no signal and I thus can not make or take calls. The status bar at the top says no service.
I purchased the phone second hand and everything was working fine so did a blacklist check just in case and both IMEI come back clear. Also when I switch from fin network automatically to manual, it will find a few networks but will no connect.
Anyone know what can be wrong? Phone has locked bootloader fyi.
Click to expand...
Click to collapse
Anyone?
Ok so I got permission and unlocked the bootloader, installed TWRP and installed RESURRECTION REMIX 5.8.5 for hydrogen but its still showing no signal. Is there a way to check what can cause the problem as I've tried swapping sim trays (have a faulty one as spares).
Please show your holiday spirit and help me
waqas321 said:
Ok so I got permission and unlocked the bootloader, installed TWRP and installed RESURRECTION REMIX 5.8.5 for hydrogen but its still showing no signal. Is there a way to check what can cause the problem as I've tried swapping sim trays (have a faulty one as spares).
Please show your holiday spirit and help me
Click to expand...
Click to collapse
I really have no idea what your problem might be, but the panacea in all weird cases, irrespective of the particular symptoms, seems to be to fastboot flash a official global stable rom with the Miflash tool.
Then you have hopefully a base "known state" to start from.
If you still have no signal, you might well have a hardware problem.
cobben said:
I really have no idea what your problem might be, but the panacea in all weird cases, irrespective of the particular symptoms, seems to be to fastboot flash a official global stable rom with the Miflash tool.
Then you have hopefully a base "known state" to start from.
If you still have no signal, you might well have a hardware problem.
Click to expand...
Click to collapse
Hi Cobben,
Installed global stable rom, still having the same issue. Where do I go from here?
waqas321 said:
Hi Cobben,
Installed global stable rom, still having the same issue. Where do I go from here?
Click to expand...
Click to collapse
Hi,
I'm not any kind of expert at these kinds of (radio signal) problems today, though I do have a background in communications electronics construction (c.a. 1980's !)
If you did a complete format of everything before flashing the ROM, and it still doesn't work, I would guess you have a hardware problem.
Of course you want to double-check that your sim cards work in other phones.
I've had some rather weird problems caused by simcards.
You should even ask for a completely new simcard from some provider, and not put it into any other phone first.
How you could go about verifying that you truly have a hardware problem, without handing it over to a service center of some kind for testing, I really don't know.
Perhaps someone else has expertise in this area?
Otherwise, you just write it off as a loss, or sell it on Ebay for whatever you can get.
same with me. my phone not showing signal. the simcard is working before. it show no simcard after i flash twrp and supersu. the problem happen after restart phone. now i'm stuck searching this solution. help me.

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

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