Re: PS4100 in RAID 6 with 3 disk drives failed
In this thread you mentioned that you "have a vendor" that you bought replacement drives from. This made me think that this particular array is no longer under support. If that is true, then you do not have the license to install the updated firmware, nor update the drive firmware either.
I don't know that you need a drive firmware upgrade, but the process is simple and the kit will update all the drives that require it or skip the ones that don't.