Michael. Nielse, as far as I know, bootutil has been validated to be use on Servers and Network adapters, not on LOMs (LAN on motherboards). NUC devices come with LOMS. http://www.intel.com/support/network/sb/cs-008018.htm
How did you enable or configured that feature on your system?
Would you please provide me the model number of the NUC you are using?
Michael, I found additional information on this.
BOOTUTIL is specifically designed to work with adapters and not LOM’s (LAN on motherboards) , however the utility may work as well.
You are free to try it, but this utility have not been validated on LOMs by us.
If for any chance the system stops performing as it should or displays strange behavior I would recommend you not use BOOTUTIL on those products.