Hi Jaya,
You can follow the steps as per the upgrade guide for CUPS 8.6
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cups/8_6/english/install_upgrade/upgrade/guide/Upgrade_Guide_for_Cisco_Unified_Presence_Release_8-6/Upgrade_Procedures.html#pgfId-1123288
Manish
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