For USB device not recognized try to run the microsoft fix it .
FIX IT .
IF it fails check by connecting couple of devices and check whether any of the devices are getting detected or not if not it might be an issue with the port.
if yes than Try to uninstall all the USB root hubs from the device manager restart the pc and than check by connecting the device.
if still the issue persist check by connecting the device to a different PC it might an issue with the device also.
lastly Try to create a New Admin account and check
hope this will be of any help...................
SOURCE: device cannot be recognized error
Try this, on a laptop, unplug the power cord, then take out the battery, unplug all usb devices, leave it alone for a minute or two and then replug the power cord and then the battery. Turn the computer on and restart as normal. replug in your usb devices and they will reinstall as usual.
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