LowerLogoVersion is a device setup class property that affects the signature score of a driver package as follows:
Windows assigns the best signature score to driver packages that have a WHQL signature for a Windows version that is the same or later than the LowerLogoVersion value.
Windows assigns the next best signature score to a driver package that was signed by a third-party using Authenticode technology and to a driver package that has a WHQL signature for a Windows version earlier than the LowerLogoVersion value.
A LowerLogoVersion value is a NULL-terminated string that specifies the Windows version, as indicated in the following table.
|Windows version||LowerLogoVersion value|
|Windows Server 2008||6.1|
|Windows Server 2003||5.2|
The system default LowerLogoVersion value for a system-defined device setup class is "5.1." This means that drivers that have a WHQL signature for Windows Server 2003 and Windows XP have the same signature score as a driver that is signed by Microsoft for Windows Vista and later versions of Windows.
For more information about driver package ranking, see How Windows ranks driver packages.