Yeah easy fix.

You cant just format the usb you need to make a partition and make it active then format it in fat32 or exfat.

Open a dos window by typing cmd in search.

now typ in diskpart.

then typ list disk

find the drive number of your usb device and then typ in.

select disk 5 for example.

now typ in clean.

then typ create partition primary.

now typ select partition 1

now typ active

then format by typing in format fs=fat32 quick

then typ assign.

job done.