Develop Bugs

[Q] USB stopped working 4.3

Hi all, how are you?
I have a Galaxy Nexus unrooted stock with Android 4.3 (JWR66V).
After the update to 4.3, my device has stopped working in MTP/PTP mode.
I mean, When I connect my phone to my Notebook USB port, thus nothing happens on my notebook or my phone.
When my phone is connected to my notebook the notification dialog to select between MTP/PTP modes doesn`t show up anymore in the phone (it only says that is charging).
I have tried to re-install the drivers on my notebook, and It didn't fix this issue.
I have also tried to the a factory reset on my phone, and It did't fix the issue either.
Besides, I tried also to connect the phone with a different USB cable and it didn't fix the issue either.
Please, May someone help me?
Thanks in advance

Please, May someone help me?
I have no idea of what is going on and why USB stopped working after 4.3 update?
How do I troubleshoot this issue?any clues?

I figure out that on Android 4.3 I have ti go to Settings->Storage->Usb Computer Connection and manually select the connection mode...
(I am not sure Why the notification pop up doesn't show anymore on the phone when I connect it to the PC using the USB cable)

RogerSilva said:
I figure out that on Android 4.3 I have ti go to Settings->Storage->Usb Computer Connection and manually select the connection mode...
(I am not sure Why the notification pop up doesn't show anymore on the phone when I connect it to the PC using the USB cable)
Click to expand...
Click to collapse
You are totally right... dont know the stu... option doesnt appears clear. On my S3 I did the same, but the option wasnt visible... you must click over USB (even it appearing as dimmed) then a USB CONNECTION (or something like) appears you must click over and then a screen with MPT option will be available... For godsake WHY such thing isnt available on settings or on shortcut menu by default is beyond my understanding.

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.

[USB Connection] Phone not detected on any PC

Update March 13th 2016: SOLVED!
--------------------------------------------------
Hi everyone!
I come to you today with a very nagging situation, and I'm not being able to figure it out! All of the sudden, my phone stopped being detected when I tried to connect it vía USB to any PC.
I would post a screencap of Windows' error here. But I posted under 10 times so Forum's Policy doesn't allow me.
Already tried:
1) Connecting the phone to 5 different computers (running on windows 7 64 / 32 bit, windows 8.1 64 bit, windows 10 64bit)
2) Enabling and disabling "USB Debugging" before plugging the phone to each computer.
3) Uninstalling and reinstalling ADB / LG G4 drivers on every computer that the phone was connected to
4) Different USB cables from different phones (Stock, Samsung Galaxy S4, S5 and S6, Nexus 4 and a generic USB cable)
5) Connecting the phone while on Windows' "Safe Mode" (Windows 7 64bit )
6) Factory reset.
7) Letting my phone discharge completely, and charging it through USB.
8) I was adviced to find the "adbkey" file and delete it. Saddly I couldn't find it anywhere (Not in Windows nor the device)
9) Accessing the "Hidden Menu" by dialing "277634#*#" => Port Check Test => Enable Port Check test
Relevant info:
* LG G4 H815 [not sure if H815AR, H815P or H815T, but certainly not european. No official bootloader unlock ): ]
* Phone charges OK with stock charger and others.
* Just before this started happening, I used a Samsung's Galaxy A5 charger.
* No notification that indicates that the phone is connected. So I can't switch from MTP to PTP mode. Is there any way to do that other than when the phone is connected to a computer?
* No new apps were installed on the phone before this started happening
* I rooted my G4 a long time ago (3 months +) by flashing it with a rooted image.
* The same USB cables were used to connect other phones to any PC and worked OK.
* Not using and external SD memory card
* Last thing I did when I was able to connect my phone to my personal notebook: I transferred some videos and photos from my phone to my PC.
* My grammar and English writing skills suck
What I think it is:
* Bloody Android 5.1. I wish I could flash the phone. But I need a PC connection to do that... yikes.
* Samsung's Galaxy A5 charger that I used. According to this theory.
Any advice/suggestion/possible solution/encouragement will be very very much welcome! I'm going crazy already.
Thanks in advance for your time and attention.
Love from Argentina,

Ok. I just did a factory reset and the problem persists.

Go to users, select your user name and and click on .android folder. Delete adbkey.

rlamba said:
Go to users, select your user name and and click on .android folder. Delete adbkey.
Click to expand...
Click to collapse
Hi! thank you for your reply.
I'm afraid I don't know where that file is.
I've tried a windows search for "*adbkey*" without luck (hidden and system files are showing).
I also manually looked into "C:\Users\<Username>" and there's no ".android" folder.
Also looked into my phone (through "Wifi transfer" app) and there's no such file
More relevant info:
I just remembered, just before experiencing this problem I used my sisters' charger one day (Samsung Galaxy A5). Could it have messed with some Integrated Circuit inside my phone? I've read here in this forum, a Mexican user presented his theory about chargers messing up USB connectivity on android phones.
¿Does anyone have more info about this? I'm not able to flash my phone, since I could never unlock bootloader. And obviously I can't do it through my pc because it's not detecting the device.

solved it! I just added the solution on the main post, highlighted in green.
I just connected the phone and I was able to access normally.

but if my g4 not work what i can do_؟؟؟؟؟؟؟؟

Just factory reset
I had the same problem in my lg g4 h815t. I just reset the phone and then my phone was detected by the pc .

Or just use http://tinyurl.com/adbiso
Sent from my LG-H815 using XDA Labs

DiegoRC said:
solved it! I just added the solution on the main post, highlighted in green.
I just connected the phone and I was able to access normally.
Click to expand...
Click to collapse
Hey, I am facing same issue but with nextbit robin after charging it with oneplus charger. I am not able to access the service menu. Should the phone be rooted for it ? It will be very helpful if you replied.

I have the same problem, but I already did all the things you did, but it still has the problem. Every single PC doesn't detect it, it only charges, what should I do? I have unrooted my Lollipop 5.1 and can't root or flash any rom anymore. Can someone help me?

Solution for my N910V Note 4
Device: (Note 4 rooted, 5.1.1).
I searched all over the place and tried everything to get my phone to connect to pc again.
What finally worked for me was using: Shortcut Master (Lite) app .
In app I searched "USB" within System Apps
Selected "USBSetting" (com.sec.usbsettings.USBSettings)
Launch > Selected AP > MTP + ADB > Reboot
My USB > PC working again.

"MTP" option wont work

Hey guys after i updated to android nougat 7.1 when i connect my phone to the computer via USB, it wont show up on my computer. all the other options are working but i just cannot access my files via computer, is anyone else having this problem?

Help!! Can't connect to pc

It's been 3 months my phone has lost the ability to connect to PC I.e. both PC and phone doesn't recognize each other. The phone start simply charging . when connected to PC . I tried enabling the mtp option in developers option no luck. I went to the lenovo service center but they say they don't know what to do. Can someone pls help me. My model is a6020a46 2gb version. Currently on official lineage nightly. And due to this I can't even update to volte firmware using qfl .pls help me:crying:

Lenovo Vibe k5 not showing USB Connected...
Well , I got the same issue here. I tried restarting my phone again and again but that didn't work.
Then I just restarted my phone while USB connected yo PC and it's showing options like MTP or Charging..
Then in PC , Search Device Manager and go portable devices .
Just update driver software if available or disable your device first , then enable the device again...You will be able to transfer
data .
It worked for me...
Best of Luck...