Khang, if it's recognized as an ADFU, then you won't see the disk driver in Win Explorer.
You'll need to get it out of recover state before you can access your player's flash disk...but you said you're having trouble with the upgrade tool. Try upgrading in another computer if you can and see if you get the same problem while upgrading.
Maybe your seller just handed you a random mp3 utilities cd so....like you said...the firmware on it is not the original firmware that your player came with.
I am afraid you're gonna have to fish for the correct firmware on the internet.
Good luck with that
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