Let me share to you what I have experienced and the solution.
I have the same 16gb and I accidentally nuke it. When I plug it in on my other laptop it shows 64mb and I am not able to reformat. So here’s what I did.
1. Usb must be plug in.
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I downloaded EaseUS data recovery and run it.
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Select the unallocated data storage.
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once done no need to hit on recover or anything.
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close EaseUS data recovery
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unplug/replug the USB
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goto disk management on your windows
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promt will show up.
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now you should see the 14gb unallocated data
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On the prompt it will ask you to format the unallocated space. no changes needed just hit on next and proceed with it.
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Done. USB should be fix