Funny that you brought this up, we’re at our family vacation home and the Toshiba HD-DVD hasn’t been connected to the Internet for over five years. I hooked it up today and it says it has 4.0/2.0; after starting the process and accepting all the Licenses, it says it has already been updated.
edit: I just looked at the back label and it’s an HD-A30, not the A2 that you were asking about.