This article explains the process of resetting the Bedrock BIOS to default settings in case the device is not booting due to some changes in the bios menus.
Disconnect power from the device.
Take a sim extractor pin and stick it in the hole beside to the console port until you feel the button click.
Hold the button pressed down and connect power to the device.
Wait for ~20-20 seconds.
You can hold the button indefinitely, however as long as you hold it, the device will keep rebooting this is expected behavior.
Release pressure from the button and let the device boot up.
First time, it might take some time for the device to boot up due to DDR training.