@TBennettcc: Whoops, my bad, 3AM strikes again ;p.
IIRC, there's one of the options in diags that creates the missing folder/file for USBNet on diags, check the manual unbricking threads and/or the wiki, that should be in there

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As for fsck/mkfs, the needed binaries might not be there in diags (can't say, it's been a long time since I checked a diags part), try to pull them from main.