Trying to update ST3600057SS firmware

I have a Poweredge R510 with a PERC S300 and some ST3600057SS SAS drives. Running Server 2008 R2, I am trying to update the firmware on the drives to ES68. Currently they have ES66 and one has ES64. Whenever I try to run the update I get an error "This update package is not compatible with your system configuration". I also tried running the DUP for ES65 and ES66 and keep getting the same error. What should i do?