The ISO are developed and maintained by Dell. As you can see from the links, the ISO are specific to given server systems and have every update including drivers, firmware etc you can think of for your server hardware.
Hi The customer Arkema is facing issues to upload Vsphere drivers ISO for R810 and T310. He is trying to upload true [URL] The customer can't use Dell Repository Manager because of their internal processes. Could you please help finding a solution for the customer. Thanks 
Issue to upload drivers ISO for R810