Wifi hardware undetected after installing MacOS Sierra
Apple decided to try and piss off as many educational customers as possible by not including basic broadcom drivers from their AirPort wifi cards.  Even the later 4321 cards do not have a driver in MacOS Sierra and some of them shipped with Mac PRO 2010's.  So Apple even lied to their own owners about what models would be supported.  I have two Mac Pro's one is a 2009 and the other is a late 2010.  The late 2010's wifi does work.  The original card from the 2009 does not work and the upgraded BCM94321MC also does not have a driver in Sierra.  My 2nd Mac Pro has the following Wifi that does work.  Apple Airport Extreme BCM94322MC.  Comedic isn't it the BCM94322MC works and the BCM94321MC doesn't.  I ordered a second 22 to fix this issue.