Hitachi Compute Blade 2000 User Manual page 476

 Reset boot option
When you reboot a server blade with Reset Boot Option Enabled, Boot Option
Priorities is initialized. Execute the following to initialize Boot Option Priorities.
Remove the boot device and Built-in EFI shell to delete the boot option

Initialize the boot priorities to the default.

Reset Boot Option is shown and available for EFI firmware version 07-43/08-43 or
later for X57A2. Make sure to execute Save Changes and Reset referring to
Exit menu before initializing Boot Option Priorities.
You cannot separately delete boot options and initialize
boot priorities. Initialize Boot Option Priorities, and then
reset boot options as necessary.
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Save &