To get the lastest firmware/drivers
Instead of downloading the application , then creating a ISO with the lastest drivers, this website has every bootable iso already made and updated. just replace the M610 with what ever you have.
Dell ESXI Install
https://dell.com/support -> Browse for a Product -> Select Servers, Storage & Networking ->PowerEdge -> Select Support Platform (See Dell VMware ESXi 6.0 blog for supported platforms) ->Drivers & Downloads -> click Change OS & select VMware ESXi 6.0 -> Expand Enterprise Solutions
Trackback from your site.