my atj2091h is dead
 

i have an mp3 player but when i upgrade firmware (9.1.5.2 i'm not sure) with another(3.x.x...) it's dead.
atj2091h(F5219FAC7H below)
SAMSUNG 637
K9F2608U0M
PCB0
USGK37RAC
i've tried s1fw , this site and downloaded many firmware(9152,9151,9043,3035,...)but the mp3 update always say error while writing firmware data to device and reboot the program or checking the device is connected. i've used mp3 player utilities 4.05,4.18 and they still didn't work.
Anyone plz help me :( thnx a lot