Hi!
I olso owned a 4GB Player, wich turned out to be an 512 MB one

.
I ran testdisk on Ubuntu/Linux, but the hack was not removed, before i used the option
[ MBR Code ] Write TestDisk MBR code to first sector
After that I formated with "gparted" and there were 470MB left!
Tomorrow I will call my seller :twisted:
xandl12