On your network’s PXE server, you move the modified ISO on to the PXE server, and edit the PXE server’s configuration file to add the ESXi 5.x or ESXi 6.0 bulletins provided with the host drivers.
/export/tftpboot/pxe
label esx6.0 kernel memdisk_linux append iso initrd = <relative path to the remastered ISO>