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See Plan and Prepare for Your System Upgrade on the Plan tab to plan your overall strategy.
Upgrade Enterprise Software Components
Once you have your upgrade plan and preparations in place, perform your system upgrade following the guidelines and sequence in Upgrading Enterprise Components 
:
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See Enterprise Deployment Models for the general upgrade sequence for the various components in the different deployment models, including Enterprise Single Site, Enterprise Multisite Centralized and SRST, and Enterprise Multisite WAN Distributed.
•See Upgrading Enterprise Components for system-level upgrade procedures for each major upgrade strategy: single-stage system upgrade, multistaged system upgrade, and multistaged migration upgrade.
For related documentation on compatibility and component upgrades, see these topics:
•Compatibility Guides
•Component Release Notes and Installation and Upgrade Documentation
