Today I’m running a ESXi, 4.1.0, 800380 on a baremetal server and want to keep it current. Here are the steps I took to successfully update my VMWare ESXi host.
Enable SSH on the host.
You can do this one of two ways, either via the vSphere Client on the host configuration tab or via the physical console. If you use the physical console, you’ll log in and change the Troubleshooting Mode Options to enable “remote tech support”. If you are remote, you can edit the Security Profile and enable Remote Tech Support in the Host’s Configuration tab.
Download the patches.
Make sure you’re downloading the patches for the ESXi Product, and not ESX. Here’s the VMWare portal for patches.