i resolve this problem by this :

1- download emmc the last one
2- download the last flasher software

do this and

1- install emmc flasher in your n900.. after that quickly & immediately install the last flasher software up on emmc

if the first time not doing will ... do it one or tow or three or more until it will don like this :

Sending and flashing rootfs image (185856 kB)...
100% (185856 of 185856 kB, avg. 11460 kB/s)
Finishing flashing... done
CMT flashing done
that is my story >> am swear its good for me
it will good for you too if you try it