The Visual BIOS on NUCs is pretty easy to update.

Review the recommended process at https://www.intel.com/content/www/us/en/support/articles/000005636/intel-nuc.html

Materials:

• USB stick formatted with the FAT filesystem

Steps:

1. Create firmware upgrade USB stick
   • Format a USB stick with the FAT filesystem
   • Download the latest BIOS firmware from Intel (named similar to wy0054.bio)
     • the same firmware file can apply to various models, but be SURE to use the correct firmware for your hardware
     • Links to help located the latest BIOS versions:
       • https://www.virten.net/vmware/homelab/intel-nuc-latest-bios-version/
       • https://nucblog.net/latest-bios/
       • Intel Download Center
   • Copy the .BIO file to the USB stick you formatted
     • You can copy multiple BIOS firmware files to the same stick; just be sure you can tell them apart when you need to use them!
     • If you are doing a BIOS recovery, you must have just the ONE file on the USB stick
2. Update the firmware on the NUC to the latest version
   • Power off the NUC
   • Insert the USB firmware stick you created
   • Boot the NUC to the Visual BIOS menu (press F2 at the boot prompt)
   • Compare the version of BIOS with the version you downloaded
   • Click Update, don't check using the Internet, and find the file on the USB stick
   • Click Open, and confirm the upgrade
   • Be patient as the system update the firmware and reboots a couple times
3. After any BIOS update, Intel recommends the following steps:
   • Press F2 during start to enter BIOS Setup
   • Press F9 to set BIOS default values
   • Customize any BIOS settings, if desired (optional)
   • Press F10 to save and exit BIOS Setup

If you are having problems and need to do a BIOS Recovery, see the instructions from Intel at https://www.intel.com/content/www/us/en/support/articles/000005636/intel-nuc.html. There are several options listed there.