It’s the code running the device itself, and there’s no real way to check for and verify a USB device’s firmware is safe. This firmware itself isn’t actually a normal piece of software that your computer has access to. A USB keyboard’s firmware would convert physical key-presses on a keyboard to digital key-press data sent over the USB connection to the computer. For example, a typical USB flash drive firmware would manage transferring the files back and forth.
These USB devices-and other components in your computer-run a type of software known as “firmware.” Essentially, when you connect a device to your computer, the firmware on the device is what allows the device to actually function.
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