AFAIK NSX manager and Controller upgrade can be done .Start with NSX manager upgrade and either you can upgrade existing controller or delete and deploy new controller. However host preparation or vib upgrades demands host to be in maintenance mode and that's where we are limited because host count is one.
Cheers,
Sree | VCIX-5X| VCAP-5X| VExpert 6x|Cisco Certified Specialist
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