Looks like BAMT .img requires the basic format that comes with the Flash media when you bought it, which I believe is FAT32.
Integrity check to see if the file you downloaded is corrupted, md5sum or sha256sum.
Since BAMT is Debian, depending on version, it may have issues with some hardware/motherboards, acting all buggy and stuff. Check the Hardware Compatability List to make sure you have supported HW. This is a Debian issue, Ubuntu or Lubuntu or Xubuntu has a much broader user base to report and take care of bugs. Debian itself is server/niche kinda, so finding buggy things takes them a little longer.
I have downlaoded 5 twice now, and tried a version 4 that I had from a few months ago that worked, still no love
I gotta be doing something just stupid and small wrong ... and when I figure it out imma punch myself LOL