title: Kextload fails on macOS Sierra. ( FTDIUSBSerialDriver failed to load)
body: <p>I'm trying to work with a FT232H board. I installed the drivers from the FTDI webpage. Both the FTDIUSBSerialDriver and the D2XX Helper Driver. 
  On running kextstat I don't see any anything with FTDI in it. I thought the kext wasn't loaded. When I tried to run "kextload -b /Library/Extensions/FTDIUSBSerialDriver.kext I got this as the output</p>
  
  <pre><code>FTDIUSBSerialDriver failed to load - (libkern/kext) not found; check the system/kernel logs for errors or try kextutil(8).
  </code></pre>
  
  <p>Same result on trying to load the AppleFTDI kext. </p>
  
  <p>How do I resolve this?</p>