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File version : 6.1.7600.16385 built by: WinDDK
Description : BulkUsb Driver
Copyright : Microsoft Corporation. All rights reserved.
Product Version : 6.1.7600.16385
Product Name : Windows (R) Win 7 DDK driver
Company Name : Windows (R) Win 7 DDK provider
Internal name : bulkusb.sys
File Size: 51872 byte(s) 50.672 KB
MD5 : 4119870b90e1b5e7797d6433d21f9216
SHA1: FF996D86B526BF7DED831DD959C70A31406CBA7B

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