I just wanted to say thanks for the information in this thread. I found the instructions contained here the easiest to follow out of all of the resources I located on the FreeNAS forums in relation to flashing the SAS controller on my X10SL7-F.
I got to the part to enter the last 9 digits of the SAS address and missed the 0 at the beginning. I went to delete everything to start over and now I have a bunch of "????" that I cannot remove and any new keystrokes just add more "???". What can I do? Is it safe to reboot and re-flash?