Fire TV 2-Series Model Number 40": HD40N200A
Fire TV Support Page
https://www.amazon.com/gp/help/customer/display.html/ref=hp_sn_aftv?nodeId=201347660
Forum for the Fire TV Omni Series 4 Series and 2 Series
https://www.amazonforum.com/s/topic/0TO6Q0000000xh4WAA/fire-tv-omni-series4series2series
Fire TV 2-Series Setup Manual
The Fire TV 2-Series Manual provides very little information about the USB port except to say that it "can be used to connect a USB cable."
Update your Fire TV software
Update the Software on Your Fire TV
To update your device's software version, go to Settings 
on your Fire TV.
- Go to Settings
on your Fire TV. - Select My Fire TV or Device & Software.
- Select About.
- Select Check for System Update.
For more help, try our Amazon Fire TV forum.
We asked the Fire TV forum this question:
More on playing USB sticks on Fire TVs
This site notes that all Fire TVs read FAT32-formatted USB drives. The BillionDollarArtGallery is formatted for FAT32.
To view external videos on Fire TV, install the free VLC for Fire media player from the app store
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