Upgrade or migrate interactively using an ESXi installer ISO image on CD/DVD or USB flash driveYou can run the ESXi 6.0 installer from a CD/DVD or USB flash drive to do an interactive upgrade or migration. This method is appropriate for deployments with a small number of hosts. The installer works the same as for a fresh installation, but if you select a target disk that already contains an ESXi 5.5 installation, the installer upgrades the host to 6.0 and gives you the option to migrate some existing host settings and configuration files, and preserve the existing VMFS datastore.
Here we are going to Upgrade or migrate to ESXi 6.0 interactively using an ESXi installer ISO image on CD/DVD or USB flash drive.
So lets start,
My current version of ESXi is 5.5 as shown below,