Solved in a flash

When we download the file, we're presented with a file called flash.bin. Running file on it, we get that it's just data. If we try and cat the file, we get a whole load of junk. Great. Lets try adn see if we can enumerate any strings from it.

strings flash.bin scroll up - yep, there's the flag.

Flag: ractf{Fl4shDump5Ar3VeryFun!!}