512MB Samsung Chip MP3 Player - Formated

[kaiserxoxe]

i bought my player in ebay also. A bougth 1 g player. I have had a lot of problems (restart automatically, loose files,...) so i tried to format. After formating, the player was 512 mb!!!!
I decided change firmware trying to solve and after change fw, the player doesnt work because when switch on, iluminates but there is no menu. I cant change to a new firmware bacause when i try to use "mp3 upgrading tool", i get the message "removable disk is busy, run program after waiting a moment" I think is blocked but the "hold" is not selected.
Anybody can help me, please?