I just got this NUC and it cannot boot from USB 3.0 flash drives. I updated BIOS to the latest version (0053 from here: https://downloadcenter.intel.com/product/70407/Intel-NUC-Kits), but that didn't fix the issue.
Same drive works fine once OS boots, and also works fine in BIOS through USB 2.0 extension cable.
Given that a year has passed since the issue was first reported, is there a solution now?
Thank you for posting in the Intel Community.
Can you boot from that key in a different USB port?
What is the format of the key? Is it NTFS or FAT32?
We have been working on a similar behavior on the following thread
https://forums.intel.com/s/question/0D50P00004AR1MK/nuc8i7hvk-usb-efi-and-a-bootable-device-has-not-..., I have test different USBs and operating systems booting form the USB 3.0 (frontal blue USB).
Hope this helps.
Intel Customer Support Technician
Under Contract to Intel Corporation
Indeed it boots from a different port! It boots from all ports EXCEPT front blue one. It still boots fine from front blue one if using USB 2 extension cable.
EFI partition is FAT32. I was using stock ubuntu image for testing: https://www.ubuntu.com/download/desktop/thank-you/?version=18.10&architecture=amd64
The key is Patriot Supersonic Rage 2 (https://www.info.patriotmemory.com/supersonicrage2). It's capable of connecting using USB 3.1 Gen 1.
Thanks for suggesting different ports. This is not a huge issue anymore.