your file may have been corrupted during download, try downloading again and/or confirming the hash. fyi, I just did the update using this file on my R630. You could also try rebooting your idrac before uploading the file to the idrac and attempting the upgrade
Rey
#Iwork4Dell

hi, i have had die same problem, 

i managed to install the IDRAC firmware by manually downloading the file and install the update via the idrac login page / and brows the location of the file that I downloaded.

The file needed for that update way is called: firmimgFIT.d9

you need to download the "File Format: An application"

it look like: iDRAC_3.32.32.32_A00 .exe ( note this was for a different server model R740)

and extract the file with WinRAR

then you get the needed: firmimgFIT.d9

i was running 3.21.21.21

then updated to 3.32.32.32 and then to 5.10.30.00_A00

after 5.10.30.00_A00 was on the R740 server then I used the web interface and used HTTPS address and pointed it to downloads.dell.com

then it done the update for me and now 7.00.00.173 is in my server

Hope this helps