We’ve been doing some internal testing today while waiting for Masso to get back to us.
They recently changed revisions of their boards. It seems that the newer revisions (send this month or later) need firmware 5.10 (we’ve been shipping them with 5.07 until today).
If you are having issues with your wifi, try updating to 5.10 and see if that corrects the ‘wifi module not found’ issue.