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File Version : V4.34
Description : Sony Ericsson Z558 USB WMC Modem Filter Driver
Copyright : Copyright (c) MCCI 1997-2005
Product Version : V4.34
Product Name : Sony Ericsson Z558 USB WMC Modem Filter Driver
Company Name : MCCI
Internal Name : Z558mdfl.sys
File Size: 9328 byte(s) 9.112 KB
MD5 : aa3ef0bad6503860de6311fa2ee15934
SHA1: 3CF6BB56A682DD76B8CF2AC44ED85272A190D62F

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How to Install z520mdfl.sys
Repair Sys ProblemsFixing a corrupted or missing z520mdfl.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.