yes that's it. recently i have upgraded my environment from 5.1 to 5.5. vcenter side everything was fine but when i upgrade esxi i got boot bank issue for Cisco 1000V. So i removed the host from 1000V and uninstalled cisco 1000v VIB from esxi and upgraded. So make sure before you upgrade esxi, third party vib installed ( other than default) if installed remove it from esxi and do upgrade.
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