Updated to 10.12.4 beta 3 today, and my ethernet stopped working. WiFi works fine. This is a mid-3012 MBP (15", 12 GB, 500GB HD, Hires screen, 2.6 i7.) I found a 2016 thread right before Sierra came out and tried those tips- deleting ethernet and recreating it, Deleting NetworkInterfaces.plist and recreating it. I tried using the USB ethernet from my MBA and that didn't work either. Rest SMC and PRAM. I've run out of ideas. I'd be fine if I could just roll back to the previous beta but I don't know how I could do that. Any suggestions on things that may work?