Intel has released two revision of BIOS for DN2820FYKH within a week in July. BIOS version 37 was released 10th of July whereas the latest BIOS version 38 was released on 17th.
Download the BIOS from Intel Download Center.
According to the release notes only a limited amount of changes has taken place in these releases. "Fixed issue where Intel wireless adapters lose connectivity." might interest some people having issues with their Intel WiFi adapters.