Adaptec Array: Kernel Panic

[Ariel Mara]

Hi all,
I got a Prolian ML110 server with 2 HD BD03695CC8.
I bought an adaptec 2120s card in order to configure the ARRAY.
And also bought a new HD, But logistics gave me this disc model BD03695A27.
It's the same size and speed as the ones I got, the difference is de Firmware version. The new one is Hpb7 and the others is HPb6
The problem is when a try to configure the array, when booting it says:
Controller Kernel Panic! and it wont boot or either let me configure the array. If I connect the old ones without the new one it works great, and if I connect only the new HD it also works great.
Should it be the firmware version? How can I do to configure the Array?
Thanks a lot!