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File version : 2.650
Description : usbmodem Device Driver
Copyright : Copyright (c) SCHUNID. All rights reserved.
Product Version : 2.650
Product Name : usbmodem Device
Company Name : Schunid
Internal name : usbmodem.sys
File Size: 87936 byte(s) 85.896 KB
MD5 : 26910e5cb2cdca5e480c58c21e3b34fc
SHA1: F323692C47936D682C4C2DA0223ACA77C3E1B7DC

Download mbtusbser.sys
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How to Install mbtusbser.sys
Repair Sys ProblemsFixing a corrupted or missing mbtusbser.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.