X rev DUPs are pre-release versions. It looks like this X rev was not renamed to an A rev like is standard operating procedure for dell: Diagnostics_Application_4V2H1_WN32_4301X09_4301.10.EXE
Is this a pre prod DUP or a slip up in not renaming/releasing correctly?
This was fixed with "http://www.dell.com/support/home/us/en/4/drivers/DriversDetails?productCode=poweredge-r640&driverId=88PX8"
Forcing downrev from the A rev to the X rev will now work.