This helped, thanks. I've been checking the toshiba canada site for over a year, and they have never posted a wifi update for the toshiba A70.
After seeing this I started looking at other toshiba sites and grabbed the update I wanted off the USA site.
My symptoms before the upgrade were that I could not connect to the router when it was in n-mixed mode and using WPA2.
If I switched to WEP, it would work, or if I switched to G/B mixed mode, but kept the WPA2, it would work.
Now WPA2 and n-mixed mode are working at the same time.