Hi Sun --
Flag: Ver 6something, right? If you start gpu folding as a shortcut you can stop folding, preferably at the end of a WU, and add it to the end of the shortcut in the form -betateam .
Or, and almost as easy, you can stop folding, preferably at the end of a WU to be safe, remove the .cfg file from the folding directory and review the contents, most notably passkey but the other stuff too if it's been a while. Re-start folding and it will prompt you to re-enter your specifics. Choose Yes to advanced options and when you get to additional parameters, add -betateam there.
I don't think the 200 series are eligible but I don't know that so with this kind of unknown limited-time points bonanza going on, worth the shot. Any ?'s just yell.