You can install or upgrade ESXi from a USB flash drive by using a script that specifies the installation or upgrade options.

Supported boot options are listed in Boot Options.


Before running the scripted installation or upgrade, verify that the following prerequisites are met:


  1. Boot the ESXi installer from the USB flash drive.
  2. When the ESXi installer window appears, press Shift+O to edit boot options.
    ESXi Installer screen
  3. Type a boot option that calls the default installation or upgrade script or an installation or upgrade script file that you created.
    The boot option has the form ks=.
  4. Press Enter.


The installation, upgrade, or migration runs, using the options that you specified.