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Since you don't have a monitor you will not be able to know when you should press F2 to enter to bios setting. You will not have any indication if you actually have entered into bios setting and you can press F9 and F10 keys. Instead, I'm suggesting to enter the bios setting from Power Button Menu:
The Power Button Menu is accessible via the following sequence:
1. System is in OFF
2. Press the power button and hold it down for 3 seconds but no more than 4 seconds
3. The system will emit three short beeps from the front panel (FP) audio port, then stop to signal. Now you should release the power button. The FP power button LED will also change from Blue to Amber when you can release the power button.
4. You should release the power button before the 4-second shutdown override.
5. Next, FP power button LED will change from Amber to Blue and then NUC will reboot into Power Button Menu. During this short boot, the LED will go OFF and then stay ON. Wait about 1 minute till NUC stabilizes.
As you see without monitor, using speaker or headphones connected to audio port and/or monitoring the power button LED color you will know that the Power Button Menu is reached.
Now pressing F2 (without confirmation) will set you into bios settings. Then press F9 and Y to set bios defaults and F10 and Y to save and exit.
Hope this helps