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I would always update the lifecycle, idrac and bios as well as PERC/RAID firmware the old fashioned way, then run something like this.
Ive seen a lot of Dell servers brick themselves with bulk updates that involve simultaneous upgrades to BIOS/i DRAC/lifecycle/PERC so do those the normal way or through lifecycle manager.
If you have a recent (11G) server - like the R31000\R610\R710 then you also have the option of using the built in Life Cycle Controller\Unified Server Configurator.
Press F10 at boot and you have a built in version of the SUU plus some more.
The USC can be configured to directly synchronize with the Dell ftp site or a controlled staging area and will let you download and patch all of the embedded components (BIOS, controller Firmware, i DRAC and the Life Cycle Controller itself).
There have been many improvements to the capabilities in recent updates (roll back of firmware updates, automatic configuration and firmware updates on part replacement for example) so it's a good idea to update the Life Cycle Controller first if there is a new version available.
Others have mentioned the SUU for 1:1 updates and the IT Assistant for centralised management.
There are SUU ISO's available for download for all Dell Servers.