most of the mp4 players have usb 1.0 i think and they say that its 2.0
so that is the problem i believe. yours is a usb 1.0 like many mp4 players.
to confirm this, first extracting and repairing your firmware.
http://www.mympxplayer.org/how-to-ex...tool-vt66.html
then load it up in Waterlily and check what it says in the USB section. most probably it will be 1.0
http://www.mympxplayer.org/waterlily...-mb-df256.html