Hello. You may boot into the LifeCycle Controller, LCC and use Platform Updates then point to FTP server to run all the necessary updates. See link on pages 6- 10 for more information: [URL]  You may also create a bootable ISO from this link to apply the same updates: [URL] 
Hello,  There are three Dell R520 servers need to update firmware, BIOS, iDRAC and other similar devices. All the details including service tags are in the table attached. Prior to upgrade any hardware components (f.ex. install new CPU and memory modules), all those units should be updated. And so we need a plan for this update. Asked for such a plan (for BIOS and iDRAC7 only) earlier, we have been kindly provided with one, but unfortunately didn’t fulfill it due to some reasons out of technical scope. Now the topic with that plan couldn’t be located. So would you please help us to build a proper plan for those servers update, including all the necessary subsystems?  Thanks a lot! P.S. the table is removed by the author
R520: need for an update plan