Update firmware problem on hard drive

Hi,

I've two hard drive seagate Cheeta 15K (ST3600057SS) with Dell equalogic firmware EN01 3Gbps.

And i'd like to use this hard drive with the maximum speed (6Gpbs) with the Dell firmware ES68.

(i've some other Dell hard drive with the same reference but all of them are in 6Gbps)

When i try to update the firmware with the Dell software in a bay MD3600i the software tell me that the hard drive aren't compatible with the firmware version.

Has someone get the same problem ?

Thanks at all,

Timoté Brusson