Create a Custom ESXi ISO Image Using vSphere Lifecycle Manager

If you have access to a vCenter Server 7.0 environment, you can use vSphere Lifecycle Manager to create and export a custom ISO.
Import the ESXi patch and vendor add-on (if applicable) zip files to the vSphere Lifecycle Manager depot. See Import Updates to the vSphere Lifecycle Manager Depot.
  1. Log in to vCenter Server using the vSphere Client.
  2. Create a new temporary cluster, selecting the
    Manage all hosts in the cluster with a single image
    check box.
  3. Select the ESXi version and vendor add-on (optional) and click
    OK
    .
  4. Export the vSphere Lifecycle Manager image as an ISO.
  5. Delete the temporary cluster.