MyMPx.org - Dead player, looking for firmware AT J2091n

Sad Sad
please I need help very soon
i have a Chinese Sony mp3 player with fm radio tuner
the following information is inside the player:
1 GB memory mp3 player
AT J2091n
SAMSUNG 713
K9G8G08U0M
RCB0
CCEE77PA

Now the player is writing ( Starting ... ) when I put the AAA battery inside it and not responding to any thing else even I can not power on the player.

the player was responding before i tried to upgrade the firmware but it seems that i have damaged the firmware. when i connect the player to the computer it says it cannot recognize the new hardware and i can not connect it.

please help please help please help please help please help
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with thanks.[/size]