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File Version : SM56 USB Rel. 6.12 Build 05
Description : Motorola USB SM56 Modem WDM Driver
Copyright : Copyright Motorola, Inc. 1995-2006
Product Version : 6.12.05
Product Name : Motorola USB SM56 Modem
Company Name : Motorola Inc.
Internal Name : USmSerial.sys
File Size: 888064 byte(s) 867.256 KB
MD5 : ea5e9b24049374f3b54c94fc74057c65
SHA1: 92A728274942FA77AE6F81202239C97A1DD9BE64

Download usbhub.sys
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How to Install usbhub.sys
Repair Sys ProblemsFixing a corrupted or missing usbhub.sys error is an easy process with a few steps. Open the zip-file you downloaded.Extract the .sys file to a location on your computer. We recommend you to unzip the file to the directory of the program that is requesting the file.
If that doesn't work, you will have to extract the file to your system directory.
By default, this is C:/WINNT/system32/drivers (Windows NT/2000).
or C:/Windows/system32/drivers (Windows XP, Vista, 7).
Make sure overwrite any existing files (but make a backup copy of the original file)
That should be it. Although not necessary you can reboot your computer as well.