Yes, there is firmware specific to the adapter. It is usually updated by the back, during the normal digital back firmware update process. If you have updated the firmware in a Imacon or Hasselblad Ixpress digital back before, you will recall it is a multi-step process.
None the less, downgrading and re-upgrading the firmware is a worth a try. This is a common trouble-shooting process. In addition, check your cables, especially your Ixpress Link cable(s).
Most importantly, a Hasselblad dealer or Hasselblad Tech Support can be of additional help with this.
Hasselblad Tel. +1-800-367-6434 (They gave both East Coast and West Coast support offices)
Regards.