New NUC ROCK user - looking for help with how to upgrade BIOS from CAP file

[killdozer (Brutalise me with music)]

New NUC install won't boot

If the NUC enters the “A bootable device has not been detected” screen you have no bootable system installed. Do this: Turn of the computer. Put a bootable USB-drive, for example a Lunix image or the ROCK image, into one USB-slot. Turn on the computer and press F10 during boot screen to enter the boot menu to be able to see bootable devices. Choose the USB-drive with the bootable image on it. Follow the instructions and install the OS on the m.2 drive. Now will the computer recognise the m.2 …

I think that this thread and the posts around the link in particular will help.