I am sorry to hear you are having problems but let me help you.
I recommend you to clear set the defaults in the bios by accessing in the bios and pressing F9. Once this has been done you can try with the bios update either the f7 method or using the executable file.
Here you have the download link for the latest Bios:
The executable file can be installed from windows and the F7 here you have the instructions:
If issue persist, Please test the system with minimum configuration (1 RAM stick, no devices attached, No USB).
All of my testing has been using a minimum configuration: 1 RAM stick (bottom slot), USB keyboard, no other devices/HDD attached.
I tried using F7 to update the BIOS from a USB stick, but it fails: "Flashing image for Intel Management Engine firmware...failed" (error #1566). I tried a couple different USB sticks (FAT32) to the same effect. On the previous NUC, this did work; however, the BIOS still locked up after.
While there are several scenarios I have found that will cause the BIOS to freeze, the easiest to reproduce is to navigate to: Visual BIOS > Performance > Performance Settings > Clock PLL > activate drop-down > de-activate drop-down. Next, the glow from the selected drop-down item will disappear, and the BIOS will no longer respond to keyboard input.
Thanks for the information provided. I tried with a different NUC model D53427RKE but I could not replicate the issue since this option seems not to be in the BIOS of this NUC and I don’t have the same model than you with me now.
I am going to try to get the same model you have and I will test it. I will be back with more information soon.
I Have exactly the same BIOS frees Problem as wtatx. I'm have e Intel NUC D3401WYK . I can enter the BIOS with F2. If i accessing a drop-down lists in the Power Menu it freez.
I can confirm this Issues, have them with my i3, too. However, if using a mouse instead of a keyboard, it works without problems, no freezes...
I will check if i can make some changes in the bios just with a mouse connected.
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I quickly reproduced this issue here in my lab and have now reported the issue to the engineering team. I did find that mouse input in the BIOS continues to work, even after the keyboard does not, so for now, that would be a workaround to the problem.