Attempt to flash again.

Keyboard out. hold u. connect.
Flash the Fiasco. but remove "-r" from the flashing command. This should prevent it from rebooting after flashing rootfs. If it doesn't, and you see the n900 gonna reboot, keep holding the power button to turn it off.

Enter flashing mode again to flash the eMMC (hold u)

Then attempt to flash the eMMC. You can keep "-r" this time

The idea is. you shouldn't get to see the "white dots loading screen" at all between flashes. Only after you're done with both flashes.