I have the exact same issue as described here however I'm not getting the 3 flashing lights to indicate the 1066mhz RAM problem as detailed in the update notes.
NUC won't post at all after 0046 firmware update and I made sure that I was using 1333mhz RAM before applying the update. There were no errors on the firmware update screen.
I have tried removing 1 stick of RAM and only using the DIMM#1 slot as indicated. I left the power cable unplugged overnight and had no luck the next morning.
Is there anything else that I could try before having to contact the warranty department?
Many thanks!