You can roll back a vCenter Server Appliance upgrade or migration by reverting to the source appliance or vCenter Server on Windows.

The roll back steps apply in the following upgrade and migration contexts:

vCenter Server Appliance with an embedded Platform Services Controller

vCenter Server Appliance with an external Platform Services Controller

You must have access to the source vCenter Server Appliance or vCenter Server on Windows.

To revert a failed migration of vCenter Server, see http://kb.vmware.com/kb/2146453.