The new boot order will be used on the next BIOS boot.
This example sets the boot order and commits the transaction:
Server# scope bios
Server /bios # set boot-order hdd,cdrom,fdd,pxe,efi
Server /bios *# commit
Server /bios # show detail
BIOS:
Boot Order: HDD,CDROM,FDD,PXE,EFI
Server /bios #