I have a problem updating/renewing my EMMC.

I did this once to:
RX-51_2009SE_1.2009.41-1.VANILLA_PR_EMMC_MR0_ARM.bin

When i try to update it again it wont succees by this wiki:
http://wiki.maemo.org/Updating_the_firmware

When i use flasher i connect N900 by USB and hold down the U. First i do the FIASCO/Rootfs image without the -R (reboot)

Then i do the same line for the EMMC image which succeed once before. But now, everytime i start the flash, it wont find the N900 and the N900 starts booting automatically after entering the flasher line.....

Any idea how to fix this ?