suyog,

I'm not very sure about your issue but if you are to use the --erase-user-data=secure flag AFAIK you should be including both the rootfs.bin and emmc.bin i.e. flasher -f -F rootfs.bin -F emmc.bin --erase-user-data=secure

Maybe do that and see if your hardware is being detected... Someone else with more knowledge of this should advice on what else should be done if its just a software issue...