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Solve Unknown Device Issue

Please follow the step by step procedure

  • Go to Windows Registry. 
  • Click “HKEY_LOCAL_MACHINE” 
  • Click “SYSTEM” 
  • Click “CurrentControlSet” 
  • Click “Services” 
  • Click “USBSTOR” 
  • Check Data of “Start” (in the Right side of the Screen) 
  •        Data is 0x00000003(3) -- USB Port works fine. 
  •        Data is 0x00000004(4) -- USB Port doesn’t work fine.