Late to this discussion,
I followed the advice I got here and updated my BIOS in a step wise manner.
I was at 1302 and went to 2009 then 3004 and finally 3101
Between 2009 and 3004 there appears to have been some big changes for the board to accept the broadwell.
I did notice that once I finally got to 3101 that I needed to have everything as stock. Pushed the CMOS button down at the bottom of the board to reset and loaded at default.
Following that, it ran at 3.5GHz with Ram at 2100Hz
But when I went back to bios and selected my saved prolife, it failed to reboot.
I discovered that I needed to re-determine what values I was going to place for the RAM and CPU as my old ones were causing it to shut down for safety.
Once I got the new numbers, it's been up and running without any problems.
Hope that helps.