Firstly, there are visual cues; USB 2.0 drives are typically black connectors. USB 3 are typically blue or teal.
If the drive says "Superspeed" or has the superspeed logo (https://www.google.com.au/search?q=usb+3.0+logos&num=50&source=lnms&tbm=isch&sa=X&ved=0ahUKEwilgdnvlZjRAhUMErwKHdBRCW0Q_AUICCgB&biw=1585&bih=1073), it's likely a USB 3.0 drive.
Secondly, connect your drive and right click it, then select properties.
If it says NTFS for the file system, reformat it (Backup anything you need to keep first), it as FAT32. Then copy the BIOS file back to the drive.