Make sure your ESXi server is up to date with the current firmware with - 2 Easy steps to upgrade VMware vSphere Hypervisor ESXi 7.0 GA to ESXi 7.0b Bulld 16324942 by downloading and applying the update directly from VMware.
In this article, I will show you step by step with screenshots to assist you - HOW TO: Deploy and Install the VMware vSphere vCenter Server 7.0 (VCSA 7.0), with some helpful tips along the way.