Citrix Xenserver is known to be based on Centos 5.x which is binary compatible to RHEL 5.
Dell offers a binary utility to upgrade your servers firmware and BIOS for Redhat Enterprise Linux.

Per default you will not be able those packages because Xenserver does not include one essential package: procmail 

Also the base repo is disabled by default. To install procmail type:

yum install procmail –enablerepo=base

Now you will be able to use the Dell firmware update packages on Xenserver.

This procedure was originally proposed in:

Install Dell firmware and BIOS upgrades on Xenserver

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