Nitinkumar, i'd say it's your memory that is having a problem, not your firmware. Don't 'update' that firmware or you could disable your player and you'll have no music at all.
You should format your player and see if that helps and check out the "How to Remove Memory Hack" tutorial here >
http://www.mympxplayer.org/how-to-re...ck-vt2400.html
Know this... the firmware is the last thing you should consider doing something to when you have problems with mp4 players.