How to show mount hidden partitions? No internet so I can't download third party programs.

So I just installed High Sierra and it's working good except the EFI partition on my USB with my kexts and everything is not showing. It did this earlier today too, I go everything ready then unplugged it and plugged it back in and it was hidden. How can I access this partition?

submitted by /u/eRa_Tension
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