your mp3 is in ADFU mode thats why it is showing the UNKNOWN USB so better to try to usb the drivers from the latest MP3 PLAYER UPDATING TOOLs and if that will not work too then use the WINDOW 98 becasue it will ask for the driver and when yu give the ADFU driver it accept the mp3 as an ADFU (HS or FS) device and then you can install the firmware to it
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