guys.. just after going through ur conversation
i was also facing the same problem since i flashed my n900 with the latest firmware from there original site. it was of the Indian region..
i flashed it 30 times... but still it gave me error in flashing emmc ...

what i did ws. i downloaded the latest global firmware instead of the Indian one ..
and then when i tried to flash my emmc. it ran successfully..
i recommend to get Global firmware
and flash it first without "-R"
then after that without booting the device flash the emmc.
im sure it will defiantely wok..
i replied coz u people only helped me to flash it.
thank you to all and.. hope my methode will also help ..