Why this article is useful
Enabling fast boot in BIOS setup utility will block you to enter to the utility again. You can re-enter to it by resetting NVRAM on the board.
How to reset NVRAM
You'll need a jumper connector to short-circuit two pins.
1. Short-circuit two J7 pins
J7 (Jumper 7) pins are the upper right of the board.
Connect two pins using a jumper connector.
2. Boot up
Shut down the board and remove the jumper connector.