An is a version of the ESXi installer that has been modified by HPE. It includes the base VMware ESXi code plus a pre-loaded set of HPE-specific drivers and management tools.
If you attempt to install the vanilla VMware ESXi ISO on an HPE server, the installation may fail to detect storage controllers or network adapters because those drivers are only available in the HPE-customized version. For this reason, HPE highly recommends using its custom image for all installations on its server line. download hpe custom image for esxi 6.5 u3
Installing a standard VMware ISO on HPE hardware often results in "No Network Adapters" errors or unrecognized RAID volumes. The HPE custom image solves this by including: An is a version of the ESXi installer