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I have a Logitech m525 mouse that I use at work (Win 7 32-bit). For the first little while, I would take the mouse home with me which meant unplugging the Unifying receiver. After a few times doing this however, I noticed that if I plugged the Unifying receiver back into a previously installed port, it wouldn't work. Over time, I've actually run out of ports to plug this device into. I get the following "USB Device Not Recognized" error:

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Looking in my device manager, I see that there is a "Unknown Device":

enter image description here

and in the devices properties status I have the following:

Windows has stopped this device because it has reported problems. (Code 43)

I've tried uninstalling and updating the driver, to no avail. I've also downloaded SetPoint, and installed previously when I first installed the mouse. It still doesn't work. My question is two fold:

  1. I have a gut feeling that there are residual corrupted drivers, hence the "Windows has stopped the device...". How do I completely remove ANY drivers associated with this device?
  2. Is there a proper way to install the Logitech Unifying receiver for Windows 7?
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This is NOT behavior of a broken/worn down unifying receiver. I've just plugged in my Desktop and everything is working fine! –  user186758 Jan 9 '13 at 19:11
    
@MaratKoshoev did you plug it into another usb slot? –  KronoS Jan 9 '13 at 20:11

6 Answers 6

I had exactly the same problem, just watched this simple video on YouTube.

Basically the steps are:

  • taking the black cap off
  • sticking a piece of paper inside making the contact points closer
  • stick the black cap back on

I tried it and it works.

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1  
I had found this video too, does in fact work, in fact the intermittent behaviour i had, working on some ports not on others at random times, the idea that the contacts were not contacting properly made a lot of sense. –  Dizzy Bryan High Nov 4 '13 at 17:22
    
I can also confirm the solution works. I tried it yesterday and have had no more problems. Also, the problem was in Windows and Linux, so I was able to quickly narrow the issue down to hardware. –  Abram Apr 2 at 17:35
up vote 2 down vote accepted

This is typical behavior of a broken/worn down unifying receiver. The only way to fix this is to purchase another. However, you'll have to setup your old devices to the new receiver using Logitech's software.

This may have to be done with each new computer you use the mouse/new unifying receiver with. Although after a fresh install of Windows 8, my receiver picked up the mouse just fine without any of the Logitech software.

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I'm pretty sure I ran into this problem after Acronis Backup & Restore 11.5 imaged my disk to a .tib file.

Both the source system and the target system were apparently missing C:\windows\inf\usb.inf afterwards.

I copied it over from my netbook and an 'Update Drivers' later, had my logitech k400 wireless keyboard working again.

This seems to have affected not just logitech unifying receivers, but all USB Composite Devices. My Android tablet is also affected, as well as my Microsoft Xbox 360 USB Controller receiver, since it has two 360 pads sync'd to it, but my wired PowerA Minix360 is not affected. My microsoft wired keyboard 600 and logitech V220 are also not affected, as they are not 'USB Composite Device', but 'USB Human Interface Device'.

USB Composite Device is used to wrap up multiple child Devices in a single parent Device, such as two USB Human Interface Device endpoints (One for keyboard, one for mouse) like the Logitech Unifying Receiver does.

Big thanks to lucvdv of answers.microsoft.com for figuring it out:

Some time ago, my system stopped recognizing some, but not all USB devices.
USB ports are fine, it reads the device descriptors but then either says
it's unknown hardware or says it can't find a driver for it.

A second symptom that must have started at the same time is that it
"forgets" all about some USB devices that have always worked fine before, 
with the same result: suddenly either "unknown" or "can't find a driver".

Two weeks ago, it was my keyboard.  
It still worked when I logged on (it had to, I used it to enter my password).
Immediately after logging on, the found new hardware thing popped up,
after a few seconds it said it failed to install my new hardware, and at
that moment my keyboard stopped working.
Never found a solution, I've been using a PS2 keyboard instead since.
I've tried other USB keyboards, it didn't recognize any of them.

Yesterday, it was the USB hub that's built into my monitor that
suddenly turned into an "unknown device", and nothing I connect
to it is detected anymore. 
In an attempt to fix that, I launched the device manager and let it
scan for new hardware.

Result: instead of my USB hub starting to work again, my 
Logitech wireless mouse stopped working. 

The "USB receiver" is now listed with an exclamation mark,
"drivers for this device are not installed".  
It worked fine just a few seconds before. 
Right now I'm back to using a wired USB mouse, but I wonder how
long that's going to keep working.

It's not the receiver that's at fault: when I plug it in,
it shows up in device management with the right name and device ID:
USB\VID_046D&PID_C52B&REV_1201 - USB\VID_046D&PID_C52B,
and status "The drivers for this device are not installed. (Code 28)".

Comparing the contents of %SystemRoot%\Inf to another Win7-64 system,
I noticed that file USB.INF was missing.
Copied it over from the other system, started device manager and
re-installed drivers for the non-working devices, and the problem is fixed.

Thanks for your patience in tracking it down, lucvdv!

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I have the same issue just now. Unifying receiver(s) works only in one USB-port and everywhere else I've got "Unknown device". Manual driver installation fails too. usb.inf was absent but search over disk C:\ shows five identical copies. After copying that file into c:\windows\inf\usb.inf and reboot everything works like a charm! –  Kondybas Jan 10 at 23:32

Have you tried unplugging the power cord from your computer (and removing the battery in case you're using a laptop) for 30 seconds?

The receiver should be recognised and working again the next time you start windows.

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This is a desktop. –  KronoS Aug 14 '12 at 15:03

If the Receiver isn't being recognized it is not necessarily broken. I plugged my t600 receiver into my pc (win 7 64bit) and i am having these same problems. I move over to my laptop (windows 8) with the same receiver and i can use the mouse with no difficulty. There is something about windows 7 64 bit that is having issues with this. Test your receiver on a different device before claiming its broken. or returning your product. Chances are you may be able to make this work.

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This is often an electrical problem between the USB receiver and the laptop USB port. It will work in some laptops and not others depending upon how well-made (and worn out) the laptop USB port is.

I opened my 2 Logitech receivers (as suggested in the youtube video) and the four copper pads appeared highly corroded with a great deal of black oxidation on the leads. I could not get them to work by stuffing a piece of paper between the circuit board and USB housing, as suggested in the video, but I was able to hold the USB receiver inside the laptop USB port with my hand and it was recognized. However a few moments later and I probably quivered and lost electrical contact, and it said, "USB port not recognized" after having formerly recognized it.

You probably need a new receiver, or you can follow the youtube video, take apart the nub, and try to put it together so it will work. I must say, you may not have good luck, the manufacturing quality of this USB transceiver is horrible, Logitech, shame on you!

I paid $12 on ebay to purchse two new USB transceivers shipped from hong kong.

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