Lte wont stay connected more than two minutes - G3 Q&A, Help & Troubleshooting

The title says it all.it all started four days ago. For some reason 4g wont connect unless i enter the hidden menu and manually choose it. After that it stays connected for two minutes and returns to 3g.
In the settings menu even if i choose 2g/3g/4g option it returns by itself to 2g/3g only.
I tried to erase the lte apk and odex under system/app. It worked for half a day and then the problem returns.
I tried to change back 10a, 10g but the problem persists. Im using 10j again.
Any other ideas guys?

tntgdh said:
The title says it all.it all started four days ago. For some reason 4g wont connect unless i enter the hidden menu and manually choose it. After that it stays connected for two minutes and returns to 3g.
In the settings menu even if i choose 2g/3g/4g option it returns by itself to 2g/3g only.
I tried to erase the lte apk and odex under system/app. It worked for half a day and then the problem returns.
I tried to change back 10a, 10g but the problem persists. Im using 10j again.
Any other ideas guys?
Click to expand...
Click to collapse
try my flashable zip(flash with tethered twrp), it works for me.
ZIP
twrp(d855 only)

I just did buddy. Now not even 3 g connects. What is wrong with this phone.

about to give up the phone and go back to my gs4. at least he worked properly.

Since no one helped I had to figure it out myself. Reinstalled everything from scratch and now it is working.

Related

No Mobile Data - Help please!

Hi All,
I got my Note 2 today, and have run into a problem already
Mobile data (HSPA+) was working when I first got the phone and used it between the shop and the way home.
When I got home, I switched over to wifi to download things.
I then flashed CWM from the cwm-root-note2.tar.md5 file in Dr Ketan's guide using PC Odin.
Then, I flashed Omega v3 via CWM.
All went without a problem.
I was still on wifi and downloading and installing all of my apps.
After a while I turned off wifi and I noticed that I wasn't getting any mobile data connection. I was getting 3 or 4 bars of mobile signal, but no 3G, H or H+ symbol to indicate mobile data.
I messaged a nearby friend on the same carrier and he said his was working fine. So, I figured I must have messed up the mobile network settings,
I checked the APN settings and they were blank, so I put them back in manually.
Still no data connection,
I went into CWM and wiped cache, dalvik and user data.
Still no good.
I downloaded the stock XXALJ1 ROM for Thailand (where I am) and flashed that, did another 3 wipes, but still no luck.
I tried doing a factory reset from the settings menu. But still no joy.
I put the SIM card into my Note 1 and it got a H+ straight away and data was working fine.(when the shop cut it down, they made a nice neat job of it, so the excess makes a decent micro sim holder). So, the network and SIM card are OK.
I noticed that when I first got the phone, the boot screen said "N7100" under "Galaxy Note II".
Now, it doesn't. I'm not sure when it changed.
I also noticed that when I do the under/factory resets, there are still some settings that aren't reset, For example, I set it to WCDMA only to see if that helped and then when I did a factory reset, it was still set like that, rather than the default "auto" that it originally comes with.
Unfortunately I didn't do a nandroid backup, as my phone came with XXALIH (without the multiscreen), so I figured I'd updated to LJ1 first.
Does anyone have any suggestions of what I can do?
Is there a full wipe ROM, or a way to reflash the bootloader and ROM?
It's 3am now, so I need to go to sleep, but this is annoying the hell out of me.
Thanks,
Rich
Carrier please?
wonsanim said:
Carrier please?
Click to expand...
Click to collapse
True Move H in Thailand.
I don't think it's a carrier issue, as I can put the SIM into my Note 1 and get H or H+ data connection straight away.
Also, I compared the APN settings and I have the exact same settings in the Note 2 and Note 1.
Mobile data was working on the Note 2 when I first got it.
Thanks,
Rich
Turn mobile data on in settings/data usage.
I doubt that his data is turned off in the settings is the problem since he already stated that he tried resetting to factory settings.
I'd suggest simply using odin to reflash J1 onto the phone and start from scratch again. This is why the devs always remind people to do a nandroid backup. In case of situations like this.
Sent from my GT-N7100 using Tapatalk 2
Thanks. Yes, Mobile data is ticked. I tried toggling that early on in case it just wasn't connecting properly or something.
I've tried flashing the stock J1 a few ties, but no joy.
It doesn't seem to do a full install, as the circle battery mod I installed previously is still there after flashing stock J1...
I'm downloading a stock XXALIE for Thailand at the moment and will try that.
It's still got 30 mins to go, and I have to leave for work soon! So, I might have to spend the day relying on wifi when I can get it
I'm wondering if the change in boot loader has anything to do with it. (Originally had "N7100" on the boot screen and now I don't, just "Galaxy Note II")
maybe APN settings are wrong? I'm from sri lanka, and I had to add an apn for mobile data to work.
OK, I finally fixed it. Here is what I did (in case anyone else has a similar problem)
Flashed stock LJ1 via odin
Downloaded Galaxy S/S2/S3 CSC
Reset my CSC to THL
Now when it restarted it picked up mobile data signal without me doing anything to the mobile network settings.
I reflashed Omega 3 and lost mobile data again. I tried the Galaxy CSC app, but it says there is only 1 CSC.
So, I went back to stock Thai LJ1.
This time I got an OTA update straight away. After that installed I noticed the boot screen had changed back to showing GT-N7100 again.
ROM is now XXALJ3 and the modem is DXALJ1
Flashed CWM and reinstalled most of my apps from Titanium Backup.
Everything is still OK.
So, it looks like I can't use Omega ROM because it changes the CSC and I can't change it back to THL.
Is there any way to install the CSC separately after flashing Omega?

[Q] No Service. Data working but no Call/Text.

Hello!
I have m919 T-Mobile Galaxy s4 but I'm with other carrier (Wind Canada). I rooted the phone about a month ago, I believe, using THIS guide.
I spent yesterday in environment where I didn't had coverage for most of the day, but i haven't gotten it back yet. Sounds really weird as it might be not connected to the fact at all. I have 4G connection active, which means that I have internet, but it keeps 'searching' for service and I can't Call/Text anyone, neither I can receive calls or texts. Instead of the bar at the top showing how good coverage i have it just shows a crossed out circle icon.
I've tried reboots, keeping my phone off for 30mins without battery, taking out sim and putting it back in, changing network modes and resetting APN (all from settings panel).
Have anyone experienced something like that and how do I fix it? It was working perfectly for last couple of months and the phone didn't get any damage yesterday neither.
P.S Did the the regular factory reset (don't know if it affects rooting) but it didn't change anything. =
I have same problem.
Did you solve it? and how?
Haven't solved it, that was the whole point of my post!
kokozaurs said:
Haven't solved it, that was the whole point of my post!
Click to expand...
Click to collapse
Never had this happen to me. Data works off your signal, something is wickedly wrong. I'd flash the modem again if you are on 4.2.2 bootloader (doesn't matter which rom or android version). If that fails, go intonrecovery, wipe cache, wipe dalvik cache, and wipe data. If that fails, backup your data and Odin flash back to 100% stock. If that fails, more than likely your /efs folder was corrupted.
Sent from my SGH-M919 using XDA Premium 4 mobile app
Please don't create multi thread on the same topic
xdapowerapps said:
Never had this happen to me. Data works off your signal, something is wickedly wrong. I'd flash the modem again if you are on 4.2.2 bootloader (doesn't matter which rom or android version). If that fails, go intonrecovery, wipe cache, wipe dalvik cache, and wipe data. If that fails, backup your data and Odin flash back to 100% stock. If that fails, more than likely your /efs folder was corrupted.
Sent from my SGH-M919 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
I think I'm gonna flash it back to 100% stock, but the problem is that I'm on mac and I don't know how to flash it back. Is there any guide on how to do it from MAC platform?
Thanks!!
kokozaurs said:
I think I'm gonna flash it back to 100% stock, but the problem is that I'm on mac and I don't know how to flash it back. Is there any guide on how to do it from MAC platform?
Thanks!!
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=755265
http://forums.techdiscussion.in/sho...Heimdall-Terminal-on-Mac-OS-(Odin-Alternative)
Second one will be more helpful. Good luck! :good:
xdapowerapps said:
http://forum.xda-developers.com/showthread.php?t=755265
http://forums.techdiscussion.in/sho...Heimdall-Terminal-on-Mac-OS-(Odin-Alternative)
Second one will be more helpful. Good luck! :good:
Click to expand...
Click to collapse
Ok, so I got heimdall, and got the recovery.img from the other topic. I followed the steps that was provided in the second link, but nothing much changed, it successfully uploaded the recovery.img, then i did recovery boot with power button + home button + volume up, it did some things with a pirate android guy in the back and thats it, booted up. Not sure if I have everything back to stock or not - either way, the issue with the network hasn't been resolved!
kokozaurs said:
Haven't solved it, that was the whole point of my post!
Click to expand...
Click to collapse
Tried this?
go to settings/more networks/Mobile networks/Network operators/Search now......
It might take a minute or two, then show you some networks it finds. Select your provider and it should list some options for you.
need to see Mobile data with a check, Data roaming checked, network mode should be LTE/GSM/WCDMA(auto connect)
If you KNOW what your APN (access Point Name) is you can check if it's correctly there.
It usually is downloaded with the search for network so just try with whatever is ther for now.
Back all the way out, and power off. Take out the battery, wait like 30 seconds, replace the battery and power on again.
See if you get service and can dial out.
Aloha and Good Luck!
bobolinko said:
Tried this?
go to settings/more networks/Mobile networks/Network operators/Search now......
It might take a minute or two, then show you some networks it finds. Select your provider and it should list some options for you.
need to see Mobile data with a check, Data roaming checked, network mode should be LTE/GSM/WCDMA(auto connect)
If you KNOW what your APN (access Point Name) is you can check if it's correctly there.
It usually is downloaded with the search for network so just try with whatever is ther for now.
Back all the way out, and power off. Take out the battery, wait like 30 seconds, replace the battery and power on again.
See if you get service and can dial out.
Aloha and Good Luck!
Click to expand...
Click to collapse
yep, one of first routines i tried. No difference
kokozaurs said:
yep, one of first routines i tried. No difference
Click to expand...
Click to collapse
Ok, now you might want to call your provider and ask them to remove you from their network and reinsert you again. That procedure will often re-enable normal operation of cellular connectivity.
They will ask you to power down and remove your battery for about a minute, then power up again.
Aloha and Good Luck!
Tried it all
Well im in the same boat here.
I checked the IMEI is correct
i did a full stock MK5 install with Odin without sim inserted and with
*#2263# helps it recognizes the network on the search list (WIND)
but it wont connect (failed to connect try again)
sometimes it connects to 4G and i can use the web
but no calls or sms
i noticed i dont have LTE enabled which ill do tomorrow
i even opened my phone to check that no cables came off as it was in service for a broken screen
tried a different sim from koodo wich also acts weird it connects to data but wont make phone calls or sms
the problems began after its been UNLOCKED (sim free)
any suggestions? im willing to try anything
its been in service 4 times and still they cant figure it out...
thanks!
ph3r0c1ty said:
Well im in the same boat here.
I checked the IMEI is correct
i did a full stock MK5 install with Odin without sim inserted and with
*#2263# helps it recognizes the network on the search list (WIND)
but it wont connect (failed to connect try again)
sometimes it connects to 4G and i can use the web
but no calls or sms
i noticed i dont have LTE enabled which ill do tomorrow
i even opened my phone to check that no cables came off as it was in service for a broken screen
tried a different sim from koodo wich also acts weird it connects to data but wont make phone calls or sms
the problems began after its been UNLOCKED (sim free)
any suggestions? im willing to try anything
its been in service 4 times and still they cant figure it out...
thanks!
Click to expand...
Click to collapse
Ok I found the solution. Apparently I have bought a stolen phone. Check the imei if it hasn't been blacklisted!

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.

[Q] Preferred network mode won't stay on GSM/WCDMA/LTE on Lollipop 20e

Every time I change my network mode to GSM/WCDMA/LTE (Auto) it goes back to GSM/WCDMA (Auto) after an hour or two. I can get LTE in my area and I do after changing the network mode setting manually, but after an hour or two my phone goes back to GSM/WCDMA and I loose LTE. I've tried going into the test menu and choosing my preferred network mode but it won't stay. My build.prop file has not been edited. I don't have the LTEconfigs.apk to delete.
Any ideas on what to do?
edit: I restored system partition from a backup. I'm fine now.
Have you at any point downgraded to KK from LP, then upgraded again back to LP? Because the same thing happened to me after downgrading, and then upgrading again.
redduc900 said:
Have you at any point downgraded to KK from LP, then upgraded again back to LP? Because the same thing happened to me after downgrading, and then upgrading again.
Click to expand...
Click to collapse
No, I never downgraded. I went from 10m to 10r to 20b to 20e, each time doing a complete system flash.
i have the exactly same problem except i am currently on 20g. I even reflashed the stock rom again and it still returns to GSM/WCDMA after reboot or idling for 1-2 hours. I changed the setting under the hidden menu as well and still didn't work.
any help is greatly appreciated.
This is a baffling problem. I have heard that both the cause and the cure is flashing back to KK and then back to LP. Among a multitude of other solutions with no real common thread. Having said that the one that makes the most sense is restoring your EFS backup, if you have one. For me I didn't have one.
Here is my experience, I wish I could say what was the real fix.
Started out at 10r and flashed CM12 as soon as I got the phone last Jan. About 6 months ago I had the common prob of the exclamation mark on my signal and no data. Used the LTE toggle to fix and lived like that for 6 months. Back in the fall I decided to go back to stock to see if it would fix. Flashed a stock zip of 20e. At 1st this was a disaster, I had no data and incidentally no APN. Oh by the way I have a TMO GS on at&t. Even after creating an APN no luck. I happened to have a live TMO SIM so I did a factory reset with the TMO SIM installed during 1st boot. This SIM is a prepaid w/o data, but it did attach to LTE. I then created an at&t APN swapped SIMs and LTE data worked. But now I had the problem of LTE not sticking. Usually dropped after a power cycle or going off WiFi, the later was not 100% reproducible, the former was. From a data standpoint I was better off as I no longer got the exclamation mark and no data. But OMG stock LG sux!
So along comes CM13. I see one guy that still had to do the LTE toggle, I figure not worth jumping in. But couldn't resit the pull of sticky Marshmallow and CM nighties. So I rooted and installed CM13. Amazingly I no longer have any data or LTE issues. Again, I wish I could give a clear path to fix. But maybe others can pull from my experience.
Good luck and if you get it working back up your EFS! Can be easily done via TWRP.

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?

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