I knew I was taking a big risk doing this but I decided to upgrade the HDD firmware on Seagate drives in my RAID5 array. And of course the HP Smart Array P212 controller is now complaining that one of the HDD sizes is invalid (too small) and I can't boot. I'm hoping I can just rollback the firmware version but I see no way to do this nor do I see any downloads for it online. HDD details:

Model: ST2000DM001 PN: 1CH164 Firmware: CC29 (was CC43)

Any suggestions, besides rebuilding my server?

PS: What's worse is that one of these three HDDs failed last week and I replaced it with a new one but the RAID hadn't refinished rebuilding, so I really need this particular drive back online if at all possible since it contains valid data.