Develop Bugs

LG G3 not being recognised, USB not transferring files

I'm hoping someone can help. I have an LG G3 D855 phone and is factory unlocked and running Lollipop 5.0. When I first got the phone (second hand), I was able to connect the phone via USB to my PC and was able to transfer files back and fore no problem. Until about 3 weeks ago, I am now unable to do this. The PC won't recognise the phone at all, all the USB connection does is charge the phone and I can see no option to get the phone to change to file transfer mode.
I had a look at Storage in the settings menu and I don't have the three dots that some people have spoke about. I have factory reset the phone and this hasn't fixed it.
I have tried using a different USB cable, this was the same. The drivers are installed (phone was recognized before). I have also tried the LG Suite, again same result. I also had a look in Device Manager for ACER something or other and this wasn't there.
I am currently having to use Bluetooth to transfer files back and fore to my PC and this is a bit slow. I'm assuming that an update LG have done has somehow broke the USB settings. I am also unable to root the phone (tried this before the USB stopped working and nothing worked) and possibly go back to KitKat 4.4.2 to even try that.
My phone has software version V20u-EUR-XX, Kernel Version 3.4.0 and build number LRX21R.A1439960697. There is no update available for my phone in the Software Update center.
After quite a bit of searching, it seems that this is a common issue but I have not found a solution to this. Can anyone help? Is there any firmware or software that I can try?
Thanks.

Assuming the OS is Win8/8.1 or Win10, have you already tried this?...
[How to fix] Windows 8/8.1/10 is not detecting my LG G3 device
http://forum.xda-developers.com/lg-g3/help/answer-windows-8-8-1-detecting-lollipop-t2967574/post57373374#post57373374
... or tried the suggestions in this thread?: http://forum.xda-developers.com/lg-g3/help/lost-usb-connection-mode-t2847857

Thanks for the reply. I am using Windows 7 Home Edition 64 Bit and had had a look for the ACER Composite ADB Interface in Device Manager and it wasn't there. Post #18 in the thread you linked to, I have no idea what kdz file I would need. Does this method need the USB to working?
Thanks for the reply and help.

I have D85520T_00.kdz and D85520U_00.kdz files. Can someone tell me if these are OK for my phone (and latest) and what the differences between the two are (apart from the file names?) Thanks again.

I couldn't tell you what the differences are between software revisions, only that 20u is newer. And I believe 20w is the latest available. I would probably try reinstalling the latest drivers from LG...
http://www.lg.com/us/support/software-firmware
... then again check to see if your PC recognizes the phone. If the "Charge phone--> Tap for more USB options" notification doesn't appear after installing the latest driverset, I'm not sure what else you could try. The LG Flash Tool needs to be able to communicate w/ the device when it's in Download Mode. You might be able to find something in the [Guide] LG G3 Stock Firmware (Go Back to Stock) KDZ & TOT Method thread related to the same problem you're having.
http://forum.xda-developers.com/showthread.php?t=2785089

Just a quick update, can't even get the phone into download mode. I press volume up, insert the USB cable in to the PC and all I get is the battery charging icon. I'll have a further look this weekend - not good so far!
Thanks again for the replies and help.
Firmware W seems to be flashable only via TWRP or ClockWorkMod just now?

I have been able to get the phone into Download Mode a few times (not all of the time) and when I run LG Flash Tool, it just tells me that the phone isn't connected. I'm going to assume that the USB port is in someway defective. Can't think of anything else.

Have you tried w/ a different PC and/or OS? Have you tried connecting the phone via different USB ports (USB 2.0 compared to USB 3.0 or vice-versa)? And I assume you've already installed the latest driverset from LG?...
http://www.lg.com/us/support/software-firmware

Yes, I got into Download Mode once or twice on the laptop. I'm using LGMobileDriver_WHQL_Ver_4.0.3. I have tried USB 2 ports on both my Laptop & PC. I've tried driver 3.81 as well.

OK, got a new USB Charger port fitted just in case it was the port that was wrong and it's still exactly the same! I did a factory reset and have setup the phone for now. During the factory reset, it does pop up with Updating Android and has 169 updates. If anyone here has the LG G3 and has it working file transfer wise, can you tell me what version of the LG USB drivers you are using? Is it possible an LG update has caused this?
Thanks.

It's fixed!!! I think there was an update yesterday for Android Devices or Services, can't remember which was made available yesterday, installed that, reconnected the phone to the computer just a few minutes ago and it has finally been recognised! I can finally transfer files between the phone and the PC.
It was an LG update that has fixed this.
At last.
I'd like to say thank you for all the replies and help.

*Solved* LG G3 No longer connects to PC via MTP/PTP - Only Charge-only

Hi Guys,
A weird one here for you, I'm already contemplating throwing my phone at a wall that's how long I've been trying to fix it.
I have a LG G3 D855 Gold 32gb model purchased via Kogan in Australia.
The unit is now on Android 5.0 (no updates available for 5.1+) - Software Version V20i-SEA-XX with Build number LRX21R.A1440645925.
This phone is non-rooted with stock ROM etc.
So the issue at hand, I upgraded my Win7 PC via the upgrade option to Win10 to retain my games/files etc.
Now when connecting the phone to the PC it only goes to charging mode and I am unable to click on it within the drop-down to change it to anything else.
I have tried LG G3 drivers, Googles generic drivers, ADB suite drivers. I am unable to adb find the phone, I do not have an Acer Composite device in Device Manager.
Win 10 keeps saying the device is not recognised/malfunctioned.
Tried different cords, double checked the connector on the phone for any dust specs etc.
My PC refuses to work with any driver I have thrown at it, however in each scenario with various drivers, warnings still persist in Device Manager.
Some of the drivers force the phone to connect/reconnect and cause the "ping" sound each time it disconnects and reconnects (with malfunction warning prompts).
This is on Win10 with 64bit Home edition.
I am at my wits end and can't think of anything I haven't tried beyond a factory reset of my phone (hoping not to at this stage as I'm thinking it's driver-related).
It won't let me tether or anything via USB also, same goes with USB debugging, no change.
Lastly which may also help narrow it down, with the phone plugged in BEFORE it gets to the OS, I can change between PTP/MTP and USB charge, however once the Win10 OS loads up, it disconnects/malfunctions and lists Charge Only.
And yes, this phone can connect on my Win7 small PC which I use for testing crap out on.
Any ideas guys?
Let me know if any log files or anything is required.
At this stage I am unable to do a root to the phone (due to adb issues etc) nor can I connect to the internal phone system unless I use in the in-built file explorer.
Edit: *SOLVED*
Ok so turns out the issue is, and this is just my case, my motherboard has various utilities, one of which is a USB 3.0 boost option.
When I did an upgrade to Windows 10, it somehow screwed up various programs on my PC including registry etc.
I reinstalled the particular utility (I was actually trying to fix my graphics clock etc so happy coincidence) which also re-installs the USB 3.0 Boost software which in turn has fixed my USB Ports.
So if you have a custom built PC (my Motherboard being a Rampage 4 Formula). Check the Mobo Utilities/Drivers for any conflicts.

I have the exact same problem, and I can't seem to find a solution for months now. It's really annoying and depressing

nicholsonr said:
Hi Guys,
A weird one here for you, I'm already contemplating throwing my phone at a wall that's how long I've been trying to fix it.
I have a LG G3 D855 Gold 32gb model purchased via Kogan in Australia.
The unit is now on Android 5.0 (no updates available for 5.1+) - Software Version V20i-SEA-XX with Build number LRX21R.A1440645925.
This phone is non-rooted with stock ROM etc.
So the issue at hand, I upgraded my Win7 PC via the upgrade option to Win10 to retain my games/files etc.
Now when connecting the phone to the PC it only goes to charging mode and I am unable to click on it within the drop-down to change it to anything else.
I have tried LG G3 drivers, Googles generic drivers, ADB suite drivers. I am unable to adb find the phone, I do not have an Acer Composite device in Device Manager.
Win 10 keeps saying the device is not recognised/malfunctioned.
Tried different cords, double checked the connector on the phone for any dust specs etc.
My PC refuses to work with any driver I have thrown at it, however in each scenario with various drivers, warnings still persist in Device Manager.
Some of the drivers force the phone to connect/reconnect and cause the "ping" sound each time it disconnects and reconnects (with malfunction warning prompts).
This is on Win10 with 64bit Home edition.
I am at my wits end and can't think of anything I haven't tried beyond a factory reset of my phone (hoping not to at this stage as I'm thinking it's driver-related).
It won't let me tether or anything via USB also, same goes with USB debugging, no change.
Lastly which may also help narrow it down, with the phone plugged in BEFORE it gets to the OS, I can change between PTP/MTP and USB charge, however once the Win10 OS loads up, it disconnects/malfunctions and lists Charge Only.
And yes, this phone can connect on my Win7 small PC which I use for testing crap out on.
Any ideas guys?
Let me know if any log files or anything is required.
At this stage I am unable to do a root to the phone (due to adb issues etc) nor can I connect to the internal phone system unless I use in the in-built file explorer.
Click to expand...
Click to collapse
Try the drivers from this site
http://forum.xda-developers.com/showthread.php?t=2785089

ludoke said:
Try the drivers from this site
http://forum.xda-developers.com/showthread.php?t=2785089
Click to expand...
Click to collapse
Using the drivers on that page you have advised gives the following.
Device Manager shows a Warning on it in USB controllers as "LGE Mobile USB Composite Device". It automatically "malfunctions" according to Windows 10 and I can't change the connection interface on the phone.
Going into the properties on that device in Device Manager lists the following;
This device cannot start. (Code 10)
A device which does not exist was specified.

http://forum.xda-developers.com/lg-g3/help/answer-windows-8-8-1-detecting-lollipop-t2967574
This also works for win 10
If u find this helpful rember the thanks button

TheMadScientist420 said:
http://forum.xda-developers.com/lg-g3/help/answer-windows-8-8-1-detecting-lollipop-t2967574
This also works for win 10
If u find this helpful rember the thanks button
Click to expand...
Click to collapse
This didn't work. Already tried

Fixed my problem
I've had the same issue with my LG G3 in being unable to connect the device to my laptop. I'm not sure if the cause was a phone software update or the upgrade from Windows 8.1 to Windows 10. Either way, I searched and fixed it tonight by installing updated drivers. Hope this helps others as well.
Hmmm, I cannot post the link! technobuzz dot net lg g3 drivers
To prevent spam on the XDA forums, ALL new users prevented from posting outside links in their messages. After approximately 10 posts, you will be able to post outside links. Thank you for understanding!

LG Flash Tool /Windows 10 Pro 64 Bit

Hi
LG G3 D855 OS Android 5 V21c-TWN-xx
I am trying to upgrade to MM via the subject Flash Tool but it gets as far as 15% and then a Window pops up telling me
that the Phone has been disconnected and to reconnect and retry.
The phone is still connected and showing as such in explorer. I re-installed the drivers and still the same problem.
Tried compatibility mode Win 8 and the same thing happens. Anyone have this problem in Win 10 or know of a way round it.
I also have a WIn 8.1 Laptop which I used to update to the current OS with Flash Tool 2014 but it is now stopping and giving an error
"This programme has stopped working MS is checking Blah Blah"
Stransky

Having the same issue here with D852

Reinstall G3 usb drivers

hi, have you tried LGUP method? http://forum.xda-developers.com/showpost.php?p=64624353&postcount=3
I used windows 7 and usb 2 ports.

twisted_twice said:
hi, have you tried LGUP method? http://forum.xda-developers.com/showpost.php?p=64624353&postcount=3
I used windows 7 and usb 2 ports.
Click to expand...
Click to collapse
LG Up shows phone as "unknown" no matter what I do.
I also have a G Flex 2 and this shows up ok in LG Up.
Sent from my iPad using Tapatalk

I downgraded from MM to LP two days ago. I had the little window saying "unknown "
The problem was that windows wasn't seeing my phone. I unplug the cable and plug it back and it worked. As I wrote before I am using windows 7.

Hi
Managed to get LG Tool 2014 to work and D855 now on v30b (MM) global.xx. Problem was driver related. I downloaded Win 10 G3 specific driver from LG site and everything then worked.

good to know pal.

i have lg g2 mini
the keyboard dos not start and my phone has number password
what can i do to restor my phone?
it is not root

I have windows 10 pro and i get same problem, i have solved this with driver usb install (sorry for my poor english)

Found my old LG-VS450PP Optimus Exceed 2 for Verizon. It was working fine when put away.
Charged the battery on a working phone (same model) but this recently resurrected phone will not boot up. Same results using vol+ / power or just power button regardless of sequencing battery out/usb cord in or out.
Gives error "boot certification verify" and then shuts down. Back light remains lit.
I can get it to open into another screen (Vol- / power) that offers four options: continue reboot, factory data reset, wipe cache, safe mode boot. Selecting any of those options results in the unit shutting down.
Vol+ plus power do not open Download window.
While it fails to boot, I can still see two folders on my Win 7 PC: image and verinfo. Image contains numerous files . So the phone IS connected to the PC but there appears to be something else that fails to initiate "connection" as far as the LG Flash tool 2014 is concerned. Any suggestions welcome.
Thinking of last resorts, I read somewhere of shorting a test point on the board but can't find directions for this model.

This web site is goog and helpfull for me.
LG Flash Tool
<strong>LG Flash Tool</strong> is the best KDZ Flash software for all kind of LG Android devices or Windows. The new version of the LG flash tool can be <strong>Downloaded</strong> here.
www.lgflashtool.com

Bricked LG G Pad 8.3 - Computer does not recognize the device

Hi all,
This is my first thread on this website and I am not that expert of rooting and installing custom ROM's. I am trying to find a solution on your website for 2 days but I couldn't solved although I tried everything.
I have an issue with my LG G Pad 8.3 (LG V500) tablet. It was installed 5.0.2 stock ROM (Korean version) and I decided to root the device and install custom ROM. I used King Root to unlock the device. Then I installed TWRP thing to my tablet and started flashing ROM process. While working the tablet restarted automatically and it was stuck at the startup with a LG icon on the screen.
I decided to make factory hard reset it in order to get rid of this but when I try to make factory reset with button combinations I get the following error;
* Confirmed *
Secure booting Error!
Cause : boot certification verify
Then I searched for the forums and first installed Android Studio, then by using SDK manager tools, I also installed USB drivers.
As the device can connect download mode, I installed adb thing and tried to fix it. But apparently laptop does not recognize the device. I run the command "adb devices" and there is no devices in the list.
I also tried to use twrp recovery tools but again it didn't recognize the device.
When I check the Device Manager when the tablet is connected to laptop on download mode, I can see LGE AndroidNet USB Serial Port (COM4) thing installed. I also tried to install Android Device drivers (Android ADB Interface, Android Bootloader Interface, Android Composite ADB Interface) but they are not working properly and they have question mark on their left side.
So as you can understand I am drawning with the issues and don't know what to do next. Apparently laptop does not recognize the device but although I checked the xda forums and other forums for 2 days, I couldn't solve. I would really appreciate if you can help me.
Best

ironunited said:
Hi all,
This is my first thread on this website and I am not that expert of rooting and installing custom ROM's. I am trying to find a solution on your website for 2 days but I couldn't solved although I tried everything.
I have an issue with my LG G Pad 8.3 (LG V500) tablet. It was installed 5.0.2 stock ROM (Korean version) and I decided to root the device and install custom ROM. I used King Root to unlock the device. Then I installed TWRP thing to my tablet and started flashing ROM process. While working the tablet restarted automatically and it was stuck at the startup with a LG icon on the screen.
I decided to make factory hard reset it in order to get rid of this but when I try to make factory reset with button combinations I get the following error;
* Confirmed *
Secure booting Error!
Cause : boot certification verify
Then I searched for the forums and first installed Android Studio, then by using SDK manager tools, I also installed USB drivers.
As the device can connect download mode, I installed adb thing and tried to fix it. But apparently laptop does not recognize the device. I run the command "adb devices" and there is no devices in the list.
I also tried to use twrp recovery tools but again it didn't recognize the device.
When I check the Device Manager when the tablet is connected to laptop on download mode, I can see LGE AndroidNet USB Serial Port (COM4) thing installed. I also tried to install Android Device drivers (Android ADB Interface, Android Bootloader Interface, Android Composite ADB Interface) but they are not working properly and they have question mark on their left side.
So as you can understand I am drawning with the issues and don't know what to do next. Apparently laptop does not recognize the device but although I checked the xda forums and other forums for 2 days, I couldn't solve. I would really appreciate if you can help me.
Best
Click to expand...
Click to collapse
I couldn't get the computer to recognize one of my LG devices using ADB until I used this...http://forum.xda-developers.com/showthread.php?t=2588979

Unable to flash ROM due to PC not recognizing device

Hello friends!
New registered user here but have already read tons of threads regarding G3 troubleshooting. Anyway, have decided to post this problem and if a similar situation has already been posted (and solved), please provide link.
For some strange reason, my G3 have decided to stay in the LG logo (I understand that this is the so-called boot-loop). This happened when the phone suddenly restarted while watching a YT vid and the battery still at 30%++. The phone just keeps on restarting until such a time that it never got pass the LG logo.
Here are the things that I have already tried to no avail:
1. Enter Hard Reset page via hardware keys (Power + Vol Up buttons). Have chosen "Yes" to hard reset device but alas, it never got pass the LG logo.
2. Downloaded PC suite, KDZ flashtool, and LGUP. Installed all three software. Connected G3 to PC and entered download mode (Vol Down while inserting USB cable). Unfortunately, unable to fully use either of the three software since the PC cannot detect G3.
Number 2 is quite strange since I have downloaded and installed all G3 drivers. This I know since a friend of mine who owns a working G3 unit was detected by the computer and can sync with the PC suite.
For some strange reason, everytime I connect my broken G3 to the computer, it is not detected by the PC and was not even listed in the device manager.
Any help and advise would be highly appreciated
I already downloaded all necessary tools (KDZ, LGUP, and flashtool) to flash the ROM but I need the PC to see the G3 unit to be able to do so.
By the way, before the bootloop scenario: the debugging (or is it developer?) options are disabled and I'm not sure if the bootloader is locked or unlocked.
I hope all this info is of any use.
Thanks a lot in advance

Have you tried simpler solutions first? Like, trying another USB ? Or another USB port from your pc? This maybe hardware related rather than software. You should try that before anything else. (Maybe you did?)

neyvermore said:
Have you tried simpler solutions first? Like, trying another USB ? Or another USB port from your pc? This maybe hardware related rather than software. You should try that before anything else. (Maybe you did?)
Click to expand...
Click to collapse
Thanks for the reply. Yup, have done those. Tried a different cable, different USB port, and borrowed a working G3 unit. The good G3 unit was detected by the PC but when I connect my broken G3 (same cable and same USB port), the PC does not detect it (not even listed in device manager).
Because of this hurdle, I couldn't flash with LGUP (it states no handset was connected). The KDZ flashtool basically says the same message.
By the way, my debugging options are disabled before this whole problem started. Could that be a reason why the PC won't detect the unit?