I have the same issue (B1 - 2.02NA)
I thought that it was working, ...now it is not.
Has anyone done a "hard reset" to see if it works with no other configurations set?
My wifi connection is at 108 Mps..... I can't get more. I think it's due to the 20/40 issue, but I'm not sure.
Because I'm only stream DivX and XviD, ...I have no issues with speed, ...so 108 is working for me.