By far, the most common question I’m asked is: Why isn’t my Fire TV’s USB port working? Hopefully people having this issue will find this post when searching for a solution. The most likely reason for the Fire TV to not recognizing a FAT32 USB drive, mouse, keyboard, or wired USB game controller is having “USB Debugging” enabled. In the Fire TV’s settings menu, if you scroll to the right to “System” and then down to “Developer Options” you’ll find an option called “USB debugging.” If that option is turned on, the USB port cannot be used with USB drives or peripherals. Turn it off and your USB port will start working again. To learn more about the Fire TV’s different developer options, see this post.