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#21
Fast boot needs to be disabled, there is no UEFI setting for this option.
You need to use the media creation tool and create a new USB key. The links were within the tutorial. It should then see it as valid boot media.
Check your key, make sure is FAT32. If not FAT32 it will not boot UEFI.
What version is your original?
Thanks.
For a test create a USB from the MCT tool and test if machine sees it as a UEFI device. You don't have to install, just see.