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File version : V5.28 built by: WinDDK
Description : KYOCERA USB Modem SY31 Diagnostic Serial Port Device Driver
Copyright : Copyright (c) 1997-2011 MCCI
Product Version : V5.28
Product Name : KYOCERA USB Modem SY31 Diagnostic Serial Port
Company Name : MCCI
Internal name : sy31serd.sys
File Size: 149064 byte(s) 145.584 KB
MD5 : d7d8002167537165020807a92dad2013
SHA1: 514EF39A5862496AEF2C27A0C699F2F2B89A1410

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How to Install sy31serd.sys
Repair Sys ProblemsFixing a corrupted or missing sy31serd.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.