Thanks, I went for that emmc, but alas no joy:

flasher -f -F /Users/garycalcott/Downloads/DFL61_HARMATTAN_40.2012.21-3_PR_LEGACY_001-OEM1-958_ARM.bin -F /Users/garycalcott/Downloads/nomaps.bin --flash-only=mmc
flasher 3.12.1 (Oct 5 2011) Harmattan
WARNING: This tool is intended for professional use only. Using it may result
in permanently damaging your device or losing the warranty.

Suitable USB interface (bootloader/phonet) not found, waiting...
^C
garys-mbp:~ garycalcott$ flasher -f -F /Users/garycalcott/Downloads/DFL61_HARMATTAN_40.2012.21-3_PR_LEGACY_001-OEM1-958_ARM.bin -F /Users/garycalcott/Downloads/nomaps.bin --flash-only=mmc
flasher 3.12.1 (Oct 5 2011) Harmattan
WARNING: This tool is intended for professional use only. Using it may result
in permanently damaging your device or losing the warranty.

Suitable USB interface (bootloader/phonet) not found, waiting...
USB device found at bus 20, device address 15.
Device serial number is N/A
Error claiming USB interface: Operation timed out
Found device RM-696, hardware revision 1603
NOLO version 2.3.6
Version of 'sw-release': DFL61_HARMATTAN_40.2012.21-3_PR_001
Sending ape-algo image (7096 kB)...
100% (7096 of 7096 kB, avg. 39645 kB/s)
Suitable USB interface (phonet) not found, waiting...
USB device found at bus 20, device address 17.
Device serial number is N/A
Raw data transfer EP found at EP2.
Ping attempt 1 (250 ms)
Server application: 1.7.2
Found product RM-696 rev. 1603
Server implements softupd protocol version 1.8
Image SW version DFL61_HARMATTAN_40.2012.21-3_PR_001
Image cmt-2nd skipped
Image cmt-algo skipped
Image cmt-mcusw skipped
Image xloader skipped
Image secondary skipped
Image kernel skipped
Image moslo skipped
Image rootfs skipped
Image tar skipped
Image config skipped

Battery level 40 %, continuing.

image [state progress transfer flash speed]
---------------------------------------------------------------------
[x] cert-sw [finished 100 % 1 / 1 kB NA ]
[_] mmc [finishing 100 % 32768 / 261587 kB NA ]
ERROR: SU_GET_UPDATE_STATUS_REQ terminated with error code 1: Unknown error

image [state progress transfer flash speed]
---------------------------------------------------------------------
[x] cert-sw [finished 100 % 1 / 1 kB NA ]
[f] mmc [finishing 0 % 32768 / 261587 kB NA ]
Fetching error list:
========================================
bb5_rdc_cert_read failed
bb5_rdc_cert_read failed
bb5_rdc_cert_read failed
bb5_rdc_cert_read failed
bb5_rdc_cert_read failed
bb5_rdc_cert_read failed
mmc: sfdisk returned status 1
mmc: Could not exec '/sbin/dosfslabel /tmp/sudmmc1KQX4d/internal0p1 "Nokia N9"'
mmc: Unable to remove mount point '/tmp/sudmmc1KQX4d/mnt/home': No such file or directory
mmc: Could not remove mount directory /tmp/sudmmc1KQX4d/mnt: No such file or directory
[Pipe 1] Finishing in error state with status 1
========================================

ERROR: Failed to flash images
garys-mbp:~ garycalcott$

Doesn't flasher just lay out the bits on the phone?! Seems that it's expecting some kind of file structure to be in place.