MSI MS-7072 Manual page 27

Chapter 2
Boot Sequence
Press <Enter> to enter the sub-menu. Then you may use the arrow keys
to select the desired device, then press <+>, <-> or <PageUp>,
<PageDown> key to move it up/down in this hard disk boot priority
list.
1st/2nd/3rd Boot Device
The items allow you to set the sequence of boot devices where
BIOS attempts to load the disk operating system.
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