We're going to need a bit more information here.
Just because a partition is set as bootable, doesn't mean that it will detect it in the boot manager.
Here's an example:
Yesterday I took a bootable USB hard drive (that could boot to UEFI specs) and deleted all the files off of it.
It was no longer bootable.
Then I copied files from another bootable device (a DVD that could boot to UEFI specs) to it and the USB hard drive booted into that program through the UEFI
What's the make and model of the motherboard?
What's the make and model of the hard drive? (not really necessary)
What partition scheme are you using?
What file system is on the partition?
Is the disk setup as GPT or MBR?
What is on the other partitions? (probably not necessary either)
What are you trying to put on this partition?
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