MP3 Product Tools 5.11
"FS" stands for Full Speed, "HS" for High Speed. These are the USB modes that different player uses, depending on the chipset. Functionally they do exactly the same.
S1clone will work happily on almost any S1 player (normal or ADFU mode), could be a good idea to try that. BUT you need to make SURE the new player is exactly the same as the bad one... how you could do that without opening it, I don't know lol.