Acer AR180 F1 - Manual (Page 107)

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Boot Settings
This submenu allows you to configure boot settings for the system.
Retry Boot Devices: Select Enabled to allow the BIOS to attempt to
reboot the system from all bootable devices after a boot failure.
Boot Device Priority
This feature allows you to specify the sequence of priority for the Boot
Device.
•
1st Boot Device
• 2nd Boot Device