Hi Mark,
although this post is better in the msp430 forum, let me give you a couple things that might help.
Have you tried the FET since? What does ccs say/ does it retry the upgrade? One other thing you can try is to see if you can do anything using the software from elprotronic. www.elprotronic.com They have a free msp430 flash programmer that also can be used to manage the FET firmware (hopefully still in your case).
Best Regards,
Lisa