macpro4,1 boot camp assistant cannot be used

Hello All,

I'm using a macpro4,1 with Mavericks 10.9.1 and boot camp assistant is telling me that it cannot be used. The error reads:

"You must update your computer's Boot ROM firmware before using this setup assistant."

According to http://support.apple.com/kb/HT1237 I am using the latest EFI firmware update, as evidenced by boot ROM version MP41.0081.B08. I tried installing the latest EFI firmare upated offered, version 1.3, but it errors with:

"This compputer does not need this update."

So, I am stuck. EFI says I have the latest, yet BCA says I need an update. It appears I have a later firmware update than is available on http://support.apple.com/kb/HT1237. However, BCA does not like this firmware. Does the community have any suggestions to resolve this catch 22?

Thanks!