When trying to flash a cmt from another sw release you need to give the ape-algo from current release, so your command should look like: flasher -a DFL61_HARMATTAN_40.2012.21-3_PR_LEGACY_009-OEM1-958_ARM.bin -F DFL61_HARMATTAN_40.2012.21-3_PR_LEGACY_001-OEM1-958_ARM.bin --flash-only=cmt -f Otherwise it is pointless, as it would be a normal flashing operation...
Thank you for your help Peterleinchen. I'll follow your instructions and let you know on the progress.