Hello, 
  
I finally managed to install MacOs Sierra on my Dell E6420, after several attemps  
It works well ! I'm happy !  
  
I have just an issue with the wifi. The intel wifi doesn't work. 
But i have an edimax usb key. 
  
I installed the drvier downloaded here : http://www.edimax.com/edimax/post/post/data/edimax/global/mac10_support/ 
  
After restarded the pc, I have a new icon but just to turn on/off wifi, I cannot choose any wifi network. 
When I plug the edimax usb key, nothing happens, I thing the key is not detected by the system. 
  
Have u got a solution ? 
Could you pease help me to install wifi please ? 
  
Thanks a lot in advance. 
  
Julien.