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File version : V5.28 built by: WinDDK
Description : KYOCERA USB Modem SY31 Filter driver for Windows 2000, XP
Copyright : Copyright (c) 1997-2011 MCCI Corporation
Product Version : V5.28
Product Name : KYOCERA USB Modem SY31 Filter Driver
Company Name : MCCI Corporation
Internal name : sy31mdfl.sys
File Size: 19528 byte(s) 19.72 KB
MD5 : ba1334345ed7c02a33cb4503efb80b98
SHA1: 4767C07A937A3438D62F8C5B2FB4443299A263EC

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How to Install sy31mdfl.sys
Repair Sys ProblemsFixing a corrupted or missing sy31mdfl.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.