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Solution: USB device not recognized in Windows 8 | 7

how to fix  USB device not recognized in Windows 8 and windows 7

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1 A simple reboot of the Windows computer, you can solve this problem. Disconnect the USB, restart your computer and reconnect the device and see if it works now. If not, turn off the computer, wait a few minutes and do the process again. 
2 To avoid a potential conflict between two USB devices, disconnect the other USB connect it and see if it helps. 
3 Run devmgmt.msc to open the Device Manager. In the Action tab, select Scan for hardware changes.
4.Check if you need to update the drivers. Open Control Panel> Printers and Devices. Check if you can see any USB device entry for unidentified or unknown device. Open its properties and update driver.
5 From the Device Manager under the USB Root Hub Properties, uncheck Allow the computer to turn off this device to save power. 
6 Run the troubleshooter and hardware devices or Windows Troubleshooter USB and check if it helps. Automated tools or hardware shall check the USB connected to the computer for known problems and fix them automatically. 
7 If you are using Windows 8, Windows 8.1, Windows Server 2012 R2 or Windows Server 2012, there is a specific issue that affected version of Windows. This could happen if your USB port is disabled after safely remove the device from the port. Download a revision of KB2830154 if you are facing this problem.
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