thatjanke , have you formatted the player with MP3 Utilities Disk Tool yet? The guide is here
http://www.mympxplayer.org/how-to-re...ck-vt2400.html
If you had already done it but the memory still stays at 256MB, it could be that the serial number was printed wrongly, either intentionally or unintentionally.
If it was unintentionally, it would be component rejects and Samsung would have sold them at a cheaper price. If it was intentionally, it might be the manufacturer or seller who tried to alter the serial number.