sony mp3 mp4 player

I HAVE SONY MP3/MP4 PLAYER WITH THE FOLLOWING DETAILS
FIRMWARE VERSION CURRENT 9.1.52 17-05-2006
ACU7515-CARD-SZG 2007-07-18
I WISH TO UPGRADE THE FIRMWARE VERSION WITHOUT AFFECTING ANY LOSS OF DATA WITH IGB MICRO SD CARD EXTENDED TO 2 GB
WOULD U HELP ME IN TYHIS ISSUE
EMAIL ID praveens1977@yahoo.co.in
I am aware of the chinese make i would require the common firmware update tool for all sony mp3/mp4 players
thanking you,
this is not amobile phone of sony product but amere mp3 player withbasic movie player