Similar problem:http://www.windows-noob.com/forums/index.php?/topic/7522-wsus-sync-sccm-error/
Try to unselect all Classisfications in SUP, ran wsusutil reset, ran another sync, re-add Classifications.
For those Unknown devices, you can check logs on them.
http://technet.microsoft.com/en-us/library/hh427342.aspx#BKMK_SU_NAPLog
Deployment Monitoring Tool is very helpful.
“enabled the Asset Intelligence and installed the Asset Intelligence synchronization point then went to Monitoring => Reporting => Asset Intelligence => Software 02D - Computers with specific software installed.”
https://social.technet.microsoft.com/Forums/en-US/cd483830-7989-463f-b493-f4ad9f389740/sccm-2012-query-report-for-specific-software-installed?forum=configmanagerosd
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