How do I boot my Windows HeroBook from USB? There are no options in the Boot Manager

How do I boot my Windows HeroBook from USB? There are no options in the Boot Manager settings. That is, I press at the CHUWI logo, which invokes the pre-boot menu, I select Boot Manager. The Boot Option Menu has one choice -" EFI Boot Devices" with a sub-menu of "Windows Boot Manager (ISOCOM).

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