I have no idea what firmware is loaded, because it doesn't work. Before it toasted itself, it was running 206NA. Hardware version is B1.
I was running the factory 203NA firmware. But, the router took minutes to change pages in the interface. And, I don't mean "a little more than 60 seconds". I mean multiple minutes EVERY time you switched pages. It was so slow at times it would actually time out and require you to log in again (thus, starting over).
There was some indication that a firmware upgrade might fix that problem. And, actually, 205NA did fix it, at least to some extent. But, I was only installing 205 because it was a required step to get to 207, and 207 killed my router.