Thanks for coming back to the community.

I am sorry to hear that have had issues with your NUC model DN2820FYKH.

I would recommend BIOS recovery on this board with latest version 0028

Please see instructions for BIOS recovery below:

http://www.intel.com/support/motherboards/desktop/sb/CS-023360.htm

File name:

FY0028.BIO

https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=23716&ProdId=3782&lang=eng&OSVersion=%0A%09%09%09%09%09%09%09%09%0A%09%09%09%09%09%09%09&DownloadType=BIOS

Allan.