wrong with SRAM and reflash

Hi all
I tried to use sram-2003-09-13 and burned with shorting JP2.
Once I succeeded, but I can 'reflash' the board
So I tried to reuse sram with "dd if=sram.img of=/dev/mem0c0c".
After some quick blinking of two LEDs, console says
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Jan  1 00:00:06 cardmgr[37]: could not open /var/run/cardmgr.pid: %m
Jan  1 00:00:06 cardmgr[37]: fopen(stabfile) failed: %m
Jan  1 00:00:06 cardmgr[37]: initializing socket 0
Jan  1 00:00:06 cardmgr[37]: unsupported card in socket 0
Jan  1 00:00:06 cardmgr[37]:   no product info available
wlan0: erroz fetching interface information: Device not found
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This doesn't mean that SRAM is burned in board.
What's wrong with me?