Even though the NUC D54250 series is discontinued, you might have an old one that wasn’t BIOS upgraded.
Intel NUC BIOS upgrade procedure
- Download Intel NUC BIOS. This page is sorted by date
- Extract the IFLASH.EXE and
.biofile to a USB flash drive.
- Reboot the NUC and at the BIOS flash screen press F7
- select the flash drive to boot from.
The Intel NUC BIOS upgrade takes 4-5 minutes.