Develop Bugs

[Q] USB not recognised

Hi all,
I've read a lot of forums on what seems to be a pretty common issue, however, with each attempt at a fix the answer is still elusive.
the problem i'm experiencing is that when I connect my (unrooted) Galaxy S2 to my pc (running windows 7) the USB device is not recognised. The phone says that it is connected (USB Connect MTP-Connected), however, when I try to access my phone via Kies or explorer it is not there. I also get an error message saying that the 'device is not recognised'.
I've taken the following actions:
- Reinstalled a fresh version of Kies
- Reinstalled samsung drivers (once prompted by Kies)
- Tried at least 3 USB cables including the original Samsung cable
- As per one of the blogs i read, i switched to USB debugging on and then off as there was no effect
- I've tried turning on bluetooth, then connecting the USB device (also a 'fix' i've seen on another forum)
- I've restarted my phone a number of times
- Connected via different USB ports
- Restarted my PC
Could anyone please help me.
Thanks,
Rob

Get a new one
Sent from my SAMSUNG-SGH-I727 using Tapatalk 2

Uninstall all drivers, and Kies.
Restart the computer.
No go to device Manager under Human Interface Device/Universal Serial Bus controllers and see if there is that little yellow triangle there. If so click and uninstall any device with the aforementioned icon.
Now reset again.
Go to the Samsung website and download the drivers for the phone. Restart the computer yet again. Almost done.
Now attach your phone and it should be identified.
Go ahead and install Samsung Kies and you should be ok. I hope all this works.

I had a very similar issue with my last SII. One day it just simply would not be recognized by many computers using various USB cords including the OEM one. Windows always said something along the lines of " USB device not recognized, a device connected to this computer has malfunctioned." The computer would pick it up bit was listed as an unknown device in the device manager. Turns out it was a hardware failure so I had so get a warranty replacement
Sent from my Galaxy Nexus using Tapatalk 2

r0b0_0 said:
Hi all,
I've read a lot of forums on what seems to be a pretty common issue, however, with each attempt at a fix the answer is still elusive.
the problem i'm experiencing is that when I connect my (unrooted) Galaxy S2 to my pc (running windows 7) the USB device is not recognised. The phone says that it is connected (USB Connect MTP-Connected), however, when I try to access my phone via Kies or explorer it is not there. I also get an error message saying that the 'device is not recognised'.
I've taken the following actions:
- Reinstalled a fresh version of Kies
- Reinstalled samsung drivers (once prompted by Kies)
- Tried at least 3 USB cables including the original Samsung cable
- As per one of the blogs i read, i switched to USB debugging on and then off as there was no effect
- I've tried turning on bluetooth, then connecting the USB device (also a 'fix' i've seen on another forum)
- I've restarted my phone a number of times
- Connected via different USB ports
- Restarted my PC
Could anyone please help me.
Thanks,
Rob
Click to expand...
Click to collapse
That happened to me one day....
All I did was reboot my phone and tried a new cable and it worked
Sent from my SGH-T989 using xda premium

Not very helpful answers... you may have sorted this out already but...
One solution found on other threads that worked for me was this:
uninstall Kies
key in the dialer *#7284#
it has 4 option there..
UART (MODEM/PDA)
USB (MODEM/PDA)
Only change the USB setting.
Select PDA, if it already selected, select MODEM, don't hit "back", try reconnect, wait for windows to respond.
Unplug, then select PDA, try reconnect.

usb device not recognised
pardus said:
Not very helpful answers... you may have sorted this out already but...
One solution found on other threads that worked for me was this:
uninstall Kies
key in the dialer *#7284#
it has 4 option there..
UART (MODEM/PDA)
USB (MODEM/PDA)
Only change the USB setting.
Select PDA, if it already selected, select MODEM, don't hit "back", try reconnect, wait for windows to respond.
Unplug, then select PDA, try reconnect.
Click to expand...
Click to collapse
Dear all, I have same problem. I have official ICS 4.0.3 on mz Smasung S2 adn when I connect phone on mz computer i receiving information "USB Device not recognised" I tried all mentioned stuff:
reinstaling driver
cleaning micro stick on phone
hard reset
*#7284#
wipe clear data and cache
but i dont have connection Please help if someone have solution for this. Thanks in advance

srdjan_trisic said:
Dear all, I have same problem. I have official ICS 4.0.3 on mz Smasung S2 adn when I connect phone on mz computer i receiving information "USB Device not recognised" I tried all mentioned stuff:
reinstaling driver
cleaning micro stick on phone
hard reset
*#7284#
wipe clear data and cache
but i dont have connection Please help if someone have solution for this. Thanks in advance
Click to expand...
Click to collapse
Try changing your usb cable. If that still doesnt help, try it on another pc. If still not, then send it to samsung for repair.
Sent from my SGH-T989 using xda app-developers app

PC not recognizing Android USB connectio
romny19 said:
That happened to me one day....
All I did was reboot my phone and tried a new cable and it worked
Sent from my SGH-T989 using xda premium
Click to expand...
Click to collapse
Romny 19, you are dead on. I had thesame problem, read your posting and good to go.
Anyone trying this must remember to power down phone completely (Reboot),

[Q] S4 Mini does not recognise PC via USB anymore

Hello everyone,
when I tried to connect my Galaxy S4 Mini (LTE i9195, Stock KitKat, rooted) via USB to my computer today, nothing happend. I checked the drivers, they are all installed. But I can connect another S4 Mini (LTE) without any problems.
I noticed that my S4 Mini does not show the notification you usually get when you connect the phone via USB (the one where you can choose Camera or MTP) anymore. The other one, which works perfect, shows this notification in the notification bar. I am using the original Samsung cable, which was shipped with the phone.
Note: My phone still charges when I connect it to the PC but does not recognise the PC connection
My phone is rooted and I used an Autostart/Reciever Toggle program yesterday - is it possible that I accidentally deactivated a necessary service?
What I tried so far:
- Google (only found solutions for "PC doesnt recognise phone" and not vice versa)
- Reboot
- DalvikCache Reset
- Cache Reset
- turn on/off USB Debugging
- use different cable
- use different usb ports
- use the code *#8080# to change MTP (it was already set to MTP...)
#Edit: It is just as in this thread (but S4 Mini instead of S4):
http://forum.xda-developers.com/showthread.php?t=2627860
I don't wanna hard reset my phone... Does anyone have an idea?
Thank you

When connected tot PC go tot: settings - storage Then press the 3 dots (right on top)
And choose USB connections. See of the desired option is selected

_nicolas_ said:
When connected tot PC go tot: settings - applications. Then press the 3 dots (right on top)
And choose USB connections. See of the desired option is selected
Click to expand...
Click to collapse
Thanks for your answer, but I can't find what you mean I have seen a post where it says that I need to go to Settings -> Storage and hit the three dots there, but on my Samsung there are no 3 dots AND nothing happens when I press the menu button either... See: random-host.com/blogs/enable-media-device-mtp-usb-mode-android-44-kitkat-and-50-lollipop
Thanks!

(Okay I got it working now.)
After I tried everything I could imagine, I decided to Flash the Stock Rom again. But before I was going to flash the new ROM I did a nandroid backup with CWM of my current ROM + everything. After Full Wiping I decided to restore the backup I just did (the ROM is still downloading hehe...) and voila it works again! Why? I have no clue...
So just backup -> full wipe -> restore backup -> worked!
#Edit: Stopped working agin... But the computer successfully connected to the phone, installed the drivers and displayed the phone in the explorer. Note: this time (when it actually worked after the restore) it showed the MTP connection in the statusbar! But now it disappeard again and is not showing up anymore...

Have u enable developer option ?? Some phones needs to enable developer optiom to recognise the phone in pc.. to enable this go to setting /about phone n click in build number more than 7 times . And then go to developer optiongn then click in USB Debugging . Then ur pc will recognise the phone.. hope this help u !!

Thanks for your reply!
As stated in my thread I already enabled/disabled and reenabled USB Debugging, and USB Debugging requires Developer Options.
But thanks for trying to help!!
Is it possible that my USB port is broken? A new one only costs 5€ so I think I'll give it a try...

Hi ! Ive the same problem... Ive you try to change your Kernel ?

I'm currently running on CM 12 and it works. However, if the pc does not recognise the phone, try rebooting your computer and your phone (that often actually works).

Mh... Try to reboot in recovery and make a wipe data / factory reset.

Any new ideas how to resolve this issue?
Did all of the above plus factory reset, tried different drivers and changed phone's charging port.
Two other phones (a Samsung and a Sony) connect to this PC just fine.
Thanks in advance
LE: In download mode the PC sees it in Odin. I tried SilviuMik's different kernel variants (the phone is stock KitKat), but nothing happens. I had no problems with it connecting to PC until about 2-3 weeks ago.

[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.

PC cannot see phone

Hi
I would appreciate any input/help on this issue.
I bought the Korean Note 10 + 5g exynos (SM-N976N), specifically for the purposes of being able to root it. I would prefer to use the Magisk approach, because I would like to be able to use Google Pay, amongst others
Try as I might, I cannot get my PC to "see" the android phone. I have engaged developer mode, checked USB debugging, checked the the USB connection as MTP mode, and gone through several cables, going by the advice of "experts" I consulted. I even went as far as returning my original phone and buying a new one, again, on the advice of an "expert" who determined that my original phone was faulty (unlikely, since I had literally taken it out of the box and attempted the rooting before trying to load my multiple software). I am using Windows 10, 64k, with all current Microsoft updates.
I have reloaded the Samsung USB drivers, rebooted both the phone and PC several times, to no avail. When I connect, in download mode, the USB cable between the two devices, I hear the "ping" on the PC, indicating that the two have made contact, but then - nothing. I have established that the cable works fine, by connecting my Note 8 to the PC, where it shows up as a device with two drives (int and SD card)
I have installed Magisk on the 10+, and modified the stock ROM with Magisk, and then copied that over to the PC, as advised by the rooting solution; the problem is that I cannot use Odin to flash that modified ROM because Odin does not recognize any phone attached to it!
Help, Please!!

Could be the Odin version your using

Perhaps, I hadn't thought of that. I am using 3.13.1. Do you have a suggestion about using a more stable/useful one? My only issue with your answer is that it's not just Odin that isn't responding- it's the entire computer - it's as if the phone doesn't exist when connected.

I'm guessing you are using a USB 3.0 port on pc? If you have access to USB 2.0 try that....
Next thing I'd suggest (with note plugged in while in download mode)....go into device manager (right click This PC)
Find device under Modem, open properties Ports tab, Advanced Settings and manually change the port setting to a lower port assignment (preferably between 1 & 5). Reboot pc and just for kicks reset the phone into Download Mode again....Give odin a try now.
Hope one or a combination of these methods help.
Sent from my [device_name] using XDA-Developers Legacy app

ADB - Cannot get it to work AT ALL. Euro H815

Ok - I'm looking for a top to bottom guide on how to get this working with my phone.
I'm wanting to install a new ROM on it to hopefully breath a new lease of life into my phone.
As I understand it, to do this I need to unlock the bootloader - and so on - and to do this using the official method I need to use the Android Debug Bridge.
I've downloaded the Android SDK - and run ADB.exe - but when I do "adb devices" nothing is returned.
I've tried assorted cables - assorted USB drivers and so on - but nothing seems to work.
So - I want to start from scratch - what do I need to do, to get a blank slate, to try again to do this.
What drivers do I need to uninstall to start again - and what should the process be, top to bottom to do this?
I assume the SDK files I downloaded is fine and working. (I've tried doing this on two different PCs - both Windows 10 though) and had the same results so I'm assuming the SDK is ok.
I've got a european H815 - which was updated to the most recent update available for the phone.
I've got Dev mode initiated on the phone with USB Debugging ticked.
Is there a specific order to do things?
Is there a specific order to initiating debugging so that it "catches"?
Does it matter whether it's on MTP or PTP or USB Tethering?
Any help would be greatly appreciated.
I think once I get this ADB thing sorted out, I should be ok, as I managed, back in the day to install several different ROMs on my old HTC Desire - and I never had this issue with that phone.
Please help!!!
PS - my PC is totally up to date with Win 10 updates too (which may well be a problem in itself)

So - I have tried the following LG Driver packages and none seem to work.
LGMobileDriver_WHQL_Ver_4.0.4.exe
LGMobileDriver_WHQL_Ver_4.4.2.exe
LGUnitedMobileDriver_S52MAN314AP22_ML_WHQL_Ver_3.14.1.zip
UniversalAdbDriverSetup.msi
When I "Inspect Devices" via Chrome - the phone shows up ok too.
The phone is recognised as being attached to the PC and can be seen on the PC in the various modes (MTP, PTP, Midi and when USB tethered I think).
When the phone is connected by USB and a disable and re-enable USB debugging, I am asked if the PC cccess my phone data and I click "Allow".
I'm stumped.

Had another go on a different machine - and again the same things were happening.
Ditched another driver - not even sure if I even installed a different driver - I wasn't taking notes thinking that nothing was going to work anyway.
It just would not catch on the ADB.
But then I tried switching between modes whilst connected and somehow it worked!!!!!
Bish bash bosh - now I've got an unlocked bootloader!!!
Now for the next steps to getting some custom ROMs installed.

Note: I think the biggest issue was the screen asking to always trust the computer - when I did the bootloader unlock - it wiped everything (which I'd forgotten about!!!).
Anyway - as it was like plugging a new phone when I just connected to my home PC - it wanted to install PC drivers, and when I activated debugging, it flashed up the screen with a certificate??? ie a load of letters and numbers - asking if I want to trust the computer. (I can't remember the proper name for the screen - but have seen some people refer to it on other posts on here).
I said yes - and bang - first try - ADB works.
My advice - for anyone trying to do something similar and having problems with ADB - get everything backed up to begin with - and then do a factory reset.
That'll most likely reset stuff on the phone, and make things smoother...