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USB Device not recognized / Unknown Device

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By Junior914, Junior Member on 20th July 2011, 11:32 PM
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I'm having an issue where my thunderbolt does not recognize my device any longer. I used to have it set up with pdanet and everything worked well for about a week. All of a sudden, any computer i tried to plug the device into, wouldn't detect the phone. A friend of mine has tried his thunderbolt on my computer and it detects it.
When plugging my phone in, it pops up an error message with "USB Device not Recognized." In the device manager, the phone shows up as Unknown Device. I have tried this on 3 different pc's, using 3 different data cables. No USB symbol displays on the taskbar of the phone when I plug it in, however, it does charge.


What I have tried:
  • Changing data cables.
  • Using another PC.
  • Uninstalling device drivers and letting windows re-detect and install.
  • Downloaded HTC Sync and ran it after uninstalling drivers again and re-plugging the phone.
  • Changed different Connection settings on the phone, such as USB Debuggin on/off, and changing it to HTC Sync Mode, Charge Only, Disk Drive, etc
  • Mounted and unmounted SD Card in the phone settings.

OS: Windows 7 x64

Thank you for any help you may provide.
 
 
21st July 2011, 08:25 AM |#2  
sxristi's Avatar
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same problem
I have the same problem with HTC mytouch 3g 32B Android 2.2.1 when I plug it through usb under Vista.
Any suggestions?
21st July 2011, 08:32 AM |#3  
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Try installing the usb drivers from htc if you haven't.

http://dl4.htc.com/RomCode/Source_an...22_release.zip
21st July 2011, 09:55 AM |#4  
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I have download the HTC usb drivers but when i go to control panel and uninstall the unknown device it just reinstalls it. when i try to update drivers using the location

ie C:\Users\sxristi\Downloads\android-usb-driver\Android USB Driver\i386

i get a reply

The best software for you device is already installed. Windows has determined that the driver software for your device is up to date.

and it continues to point to

unknown device
21st July 2011, 10:23 AM |#5  
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Oh one more things i got the usb drivers from Android SDK Manager the google usb drivers revision 4 and the weird thing is that i do not get the trident usb nor the debug icon on my HTC when i plug it in to my vista. I did get it once or twice before but not in general since the usb devices are not recognized. However when i boot on my Ubuntu os then i do get them recognized. so i guess the problem is with windows drivers somehow...
21st July 2011, 05:46 PM |#6  
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Thanks for the replies.

I've tried to install the drivers from HTC but Windows says that the driver is not compatible with my the device.

Also, I tried on a system with Windows XP and everything worked as intended, but I cannot get it to work properly in Win 7 x64 anymore.
21st July 2011, 06:21 PM |#7  
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When my win7 comp no longer sees my Tbolt I have to toggle the USB Debugging off then back on. Usually within a few seconds it reads it again. If that does not work I have also used the option to turn on internet pass through then change it back to hard drive mode. Either of those usually work for me. My drivers I used were from android sdk if that makes any difference. Hope this helps.

Sent from my ADR6400L using Tapatalk
22nd July 2011, 12:30 AM |#8  
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These didn't work, but thanks for the input
22nd July 2011, 10:25 AM |#9  
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Unhappy HTC
My problem continues under Vista OS. I called HTC and they told me to re install their Sync after removing Adobe Air and all HTC drivers and Google USB drivers. I did that and reinstalled Sync and still nothing. They also told me to call microsoft for it seems operating system conflict.

My conclusion yields toward windows conflict. But I can not figure out this conflict. Perhaps something I have installed does not let my vista recognize the HTC android device and uses the windows usb drivers to create this "Unknown Device" under usb serial bus controllers. once it is an unknown device forget about Sync or ADB etc... The phone is just not recognized as android and you can not do much with it via windows.

For the person who suggested to turn "USB Debugging" on-off, i did that and still the computer recognizes that there is a usb device but again it says "usb device not recognized unknown device.."

any additional suggestions???
26th July 2011, 05:48 PM |#10  
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I've verified that my phone works fine on Windows XP. I still cannot connect to windows 7, though.
4th August 2011, 04:33 PM |#11  
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Try turning OFF Fast Boot and turning ON USB debugging. this helped for me.
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